Language：English   Publishing type：Research paper (scientific journal)  

DOI： https://doi.org/10.1016/j.gloplacha.2018.12.014

Language：English   Publishing type：Research paper (scientific journal)  

DOI： https://doi.org/10.1016/j.palaeo.2018.10.033

Language：English   Publishing type：Research paper (scientific journal)  

The approximately 10,000-year-long Last Glacial Maximum, before the termination of the last ice age, was the coldest period in Earth’s recent climate history1. Relative to the Holocene epoch, atmospheric carbon dioxide was about 100 parts per million lower and tropical sea surface temperatures were about 3 to 5 degrees Celsius lower2,3. The Last Glacial Maximum began when global mean sea level (GMSL) abruptly dropped by about 40 metres around 31,000 years ago4 and was followed by about 10,000 years of rapid deglaciation into the Holocene1. The masses of the melting polar ice sheets and the change in ocean volume, and hence in GMSL, are primary constraints for climate models constructed to describe the transition between the Last Glacial Maximum and the Holocene, and future changes; but the rate, timing and magnitude of this transition remain uncertain. Here we show that sea level at the shelf edge of the Great Barrier Reef dropped by around 20 metres between 21,900 and 20,500 years ago, to −118 metres relative to the modern level. Our findings are based on recovered and radiometrically dated fossil corals and coralline algae assemblages, and represent relative sea level at the Great Barrier Reef, rather than GMSL. Subsequently, relative sea level rose at a rate of about 3.5 millimetres per year for around 4,000 years. The rise is consistent with the warming previously observed at 19,000 years ago1,5, but we now show that it occurred just after the 20-metre drop in relative sea level and the related increase in global ice volumes. The detailed structure of our record is robust because the Great Barrier Reef is remote from former ice sheets and tectonic activity. Relative sea level can be influenced by Earth’s response to regional changes in ice and water loadings and may differ greatly from GMSL. Consequently, we used glacio-isostatic models to derive GMSL, and find that the Last Glacial Maximum culminated 20,500 years ago in a GMSL low of about −125 to −130 metres.

DOI： https://doi.org/10.1038/s41586-018-0335-4

Language：English   Publishing type：Research paper (scientific journal)  

The USS Emmons, a 106m US Navy Gleaves‐class destroyer minesweeper that sank in 40m of water off Okinawa Island, Japan after kamikaze attack in 1945, is used as a case study for examining the history, multivocal significance, and heritage management of a World War II naval battle site. A baseline record of the site was made using an innovative method incorporating precise control points obtained from high‐resolution multibeam echosounding bathymetry to generate 3D models using structure‐from‐motion photogrammetry. The 3D models produced can be used for sharing information about this underwater cultural heritage and for future in situ monitoring of the archaeological remains.

DOI： 10.1111/1095-9270.12301

Language：English   Publishing type：Research paper (scientific journal)  

Previous drilling through submerged fossil coral reefs has greatly improved our understanding of the general pattern of sea-level change since the Last Glacial Maximum, however, how reefs responded to these changes remains uncertain. Here we document the evolution of the Great Barrier Reef (GBR), the world’s largest reef system, to major, abrupt environmental changes over the past 30 thousand years based on comprehensive sedimentological, biological and geochronological records from fossil reef cores. We show that reefs migrated seaward as sea level fell to its lowest level during the most recent glaciation (~20.5–20.7 thousand years ago (ka)), then landward as the shelf flooded and ocean temperatures increased during the subsequent deglacial period (~20–10 ka). Growth was interrupted by five reef-death events caused by subaerial exposure or sea-level rise outpacing reef growth. Around 10 ka, the reef drowned as the sea level continued to rise, flooding more of the shelf and causing a higher sediment flux. The GBR’s capacity for rapid lateral migration at rates of 0.2–1.5 m yr−1 (and the ability to recruit locally) suggest that, as an ecosystem, the GBR has been more resilient to past sea-level and temperature fluctuations than previously thought, but it has been highly sensitive to increased sediment input over centennial–millennial timescales.

DOI： https://doi.org/10.1038/s41561-018-0127-3

Other Link： https://www.nature.com/articles/s41561-018-0127-3

Language：English   Publishing type：Research paper (scientific journal)  

DOI： https://doi.org/10.1016/j.quaint.2017.09.032

Language：English   Publishing type：Research paper (scientific journal)  

The Yarabuoki underwater site contains seven iron grapnel anchors and Early Modern Okinawan ceramic jars and is dated to the 16th–19th centuries. The site lies at a depth of 12–32 m off the western coast of Ishigaki Island in Okinawa, Japan. Based on underwater archaeological and broadband multibeam surveys, as well as historical research of the artefacts and Early Modern Ryukyuan shipping, we discuss the possible anchor and vessel types in Ryukyu and Eastern Asia in EarlyModern times.We also discuss the efficacy of low-costROV for assisting surveys in shallow-water environments and the value of educational programmes for promoting the management and conservation of underwater cultural heritage.

DOI： 10.1111/1095-9270.12145

Language：English   Publishing type：Research paper (scientific journal)  

The spatial distribution of modern coral reefs in the Northwest Pacific (NWP) is restricted to approximately 30°N. Understanding the high-latitude reef-growth process and its correlation to climate change may provide important insights into future reef growth at even higher latitudes in response to globalwarming.We conducted field surveys and obtained seven cores from the raised reefs of Kodakara Island (29°N, 129°E) in the NWP to determine the changes in and response of reef growth dynamics to millennial-scale climate change through the Holocene. To reconstruct the timing of the reef growth, 37 coral ageswere determined using acceleratormass spectrometry (AMS) radiocarbon dating.
The island is characterized by three Holocene reef terraces (Terraces I to III), which were uplifted ca. 2.4 ka, 1.0–0.4 ka, and in the modern era. Three growth hiatuses occurred circa 5.9–5.8 ka, 4.4–4.0 ka, and 3.3–3.2 ka, which correlate with millennial-scale climate changes (Hamanaka et al., 2012). The reef growth began at least 8 ka. Relatively rapid vertical growth of 3.6–3.3 m kyr−1 occurred between 8 and 6 ka. The reef started growing near land and then gradually extended seaward. The reef growth around the reef slope decelerated after 6 ka
and most likely coincided with the first and second hiatuses detected landward. In contrast with the reef flat, which resumed its growth after the third hiatus event, the reef mound accretion on the slope ceased definitively. Terrace I was uplifted ca. 2.4 ka. The reef growth reactivated ca. 1.3 ka, and the reef grewat a rate of 9.1m kyr−1 between 1.3 and 1.0 ka; this rate is the fastest growth recorded in this study. This time interval corresponds to the Medieval Climatic Anomaly (MCA). The cause of the delayed reef growth between 2.4 and 1.4 ka remains unclear, but itmay imply the existence of a late Holocene hiatus due to a weaker Kuroshio Current (KC) ca. 1.7 ka and to strong El Niño-Southern Oscillation (ENSO) activity between 2 and 1.5 ka in the East Pacific. The timing of the hiatuses agrees with theweakening of the KC and themore frequent El Niño events during the positive phase of the Pacific Decadal Oscillation (PDO), whereas the rapid growth coincides with La Niña conditions, such as the MCA, during the negative phase of the PDO. Our results indicate that the climate event at approximately 4 ka caused the largest change in the reef growth, and it may have affected reefs throughout the Pacific region. Specifically, the ENSO and PDO phases may have impacted the reef growth and KC behavior.

DOI： 10.1016/j.geomorph.2015.04.011

Language：English   Publishing type：Research paper (scientific journal)  

Submerged tropical karst features were discovered in Nagura Bay on Ishigaki Island in the southern Ryukyu Islands, Japan. The coastal seafloor at depths shallower than ~130 m has been subjected to repeated and alternating subaerial erosion and sedimentation during periods of Quaternary sea-level lowstands. We conducted a broadband multibeam survey in the central area of Nagura Bay (1.85 × 2.7 km) and visualized the high-resolution bathymetric results over a depth range of 1.6–58.5 m. Various types of humid tropical karst landforms were found to coexist within the bay, including fluviokarst, doline karst, cockpit karst, polygonal karst, uvalas, and mega-dolines. Although these submerged karst landforms are covered by thick postglacial reef and reef sediments, their shapes and sizes are distinct from those associated with coral reef geomorphology. The submerged landscape of Nagura Bay likely formed during multiple glacial and interglacial periods. According to our bathymetric results and the aerial photographs of the coastal area, this submerged karst landscape appears to have developed throughout Nagura Bay (i.e., over an area of approximately 6 × 5 km) and represents the largest submerged karst in Japan.

DOI： DOI: 10.1016/j.geomorph.2014.07.032

Language：English   Publishing type：Research paper (scientific journal)  

To evaluate the relationships between coral calcification, thermal stress, and sedimentation and eutrophication linked to
human impact (hereafter referred to as ‘‘land development’’) by river discharge, we analyzed growth characteristics in the
context of a paleoenvironment that was reconstructed from geochemical signals in modern and fossil (1.2 cal kyr BP and
3.5 cal kyr BP, respectively) massive Porites corals from Nagura Bay (‘‘Nagura’’) and from modern Porites corals from the
estuary of the Todoroki River, Shiraho Reef (‘‘Todoroki’’). Both sites are on Ishigaki Island, Japan, and Nagura is located
approximately 12 km west of Todoroki. At Nagura, the individual corals provide time windows of 13 (modern), 10 (1.2 cal
kyr BP), and 38 yr in length (3.5 cal kyr BP). Here, we present the coral annual calcification for Nagura and Todoroki, and (bi)
monthly resolved records of Sr/Ca (a proxy of sea surface temperature (SST)) and Ba/Ca (a proxy of sedimentation and
nutrients related to land development) for Nagura. At Nagura, the winter SST was cooler by 2.8uC in the 1.2 cal kyr BP, and
the annual and winter SSTs in the 3.5 cal kyr BP were cooler by 2.6uC and 4.6uC, respectively. The annual periodicity of Ba/Ca
in modern coral is linked to river discharge and is associated with land development including sugar cane cultivation.
Modern coral calcification also has declined with SST warming and increasing Ba/Ca peaks in winter. However, calcification
of fossil corals does not appear to have been influenced by variations in Sr/Ca and Ba/Ca. Modern coral growth
characteristics at Nagura and Todoroki indicate that coral growth is both spatially and temporally influenced by river
discharge and land development. At Nagura, our findings suggest that land development induces negative thermal
sensitivity for calcification in winter due to sugar cane harvest, which is a specifically modern phenomenon.

DOI： 10.1371/journal.pone.0088790

Language：English   Publishing type：Research paper (scientific journal)  

Although coral calcification is directly related to coral health, few studies have examined the responses of
coral calcification to environmental stresses, with the exception of ocean acidification. In this study, we experimentally
exposed aposymbiotic (lacking symbionts) and symbiotic primary polyps of the scleractinian
coral Acropora digitifera to several seawater temperatures (27, 29, 31, and 33 °C) and salinities (26, 28, 30,
32, and 34) to investigate the effects of thermal and freshening stresses on coral calcification from the standpoint
of coral-algal symbiosis. Calcification rates were higher for symbiotic versus aposymbiotic polyps in
both sets of experiments, except for those reared at 31 °C and 33 °C. Calcification responses of symbiotic
polyps were a non-linear function of temperature, and the threshold temperature affecting skeletal growth
and bleaching was between 29 °C and 31 °C. Calcification rates of aposymbiotic polyps were also a nonlinear
function of temperature, with a maximum polyp weight at 31 °C, suggesting that thermal stress also
did some damage to the coral host itself. In contrast, skeletal growth of both aposymbiotic and symbiotic
polyps decreased linearly with increased salinity. Observations of the microstructure of polyp samples
revealed a clearly cyclic feature of skeletal surfaces that was likely related to organo-mineral deposition of
calcium carbonate even under lowered-salinity conditions. However, neither type of polyp reared at 33 °C
evidenced this characteristic, suggesting that thermal stress had compromised the normal calcification process,
which involves secretion of an organic matrix by the coral host. Our results suggest that the effects of
future global warming will include a reduction in coral calcification itself and the collapse of coral-algal symbiosis,
at least at the primary polyp stage. The present experiments showed that thermal stress would affect
the host's physiological functionality, whereas freshening stress, which is simply the dilution of ambient
seawater, would affect the mineralization process associated with coral calcification.

DOI： 10.1016/j.gloplacha.2012.05.001

Language：English   Publishing type：Research paper (scientific journal)  

The relative warmth and stability of the Holocene was punctuated by several brief cold events. Whereas these cold
events on a global scale are widely reported, the lack of records from regions such as the East China Sea (ECS) results in
an incomplete understanding of the underlying cooling mechanism.
Here, we present a coral-based paleo-SST (sea-surface temperature) reconstruction from the ECS to constrain Holocene
variability in the Kuroshio Western Boundary Current and the East Asian Monsoon (EAM). Our new data confirm that
cold conditions prevailed at 3.8 cal kyr BP, which is consistent with the previously-reported Pulleniatina Minimum Event
(PME). While this previous reconstruction could not reveal seasonal differences, our high-resolution data indicate a differing
seasonal SST response between summer and winter. This result provides an important insight into understanding
the mechanism of the millennium scale cold event in the ECS, the region affected by EAM.

Language：English   Publishing type：Research paper (scientific journal)  

Recent studies have reported Holocene millennial-scale climate instability at a global scale. However, the relationship
between this climate variability and coral reef growth is still unclear. Field observations and highprecision,
in situ coral radiocarbon dating of the excavated trench walls of an uplifted middle-to-late Holocene
coral reef on Kodakara Island, located in the pathway of the Kuroshio Current in the northwestern Pacific,
show evidence of the existence of disturbances with hiatuses in coral reef growth and coral composition differences
before and after the disturbances.We found three disconformities in the reef, and the dating results indicate
that disturbances with hiatuses in reef growth occurred at approximately 5.9 to 5.8, 4.4 to 4.0, and 3.3 to
3.2 cal yr B.P. The results also indicate that the second and third eventswere associatedwith sea-level oscillation.
The timing of the disturbances corresponds well with the periods when the Kuroshio Current was relatively
weak andwas associatedwith a relatively cold sea surface temperature,which may have enhanced the cold winter
Asian monsoons, and with Holocene North Atlantic ice-rafting cold events. The coral composition clearly
changed before and after the disturbances, with gradually reduced diversity resulting in a reef dominated by
acroporiid coral. These data led to the hypothesis that coral reef growth was interrupted by suborbital
millennial-scale global climate change induced by persistent solar activity during the Holocene in highlatitude
coral reefs, such as those in the Northwest Pacific, leading to low diversity in the reefs that experienced
each disturbance. Our results may provide new insights into theories of past and future coral reef formation
worldwide.

DOI： 10.1016/j.gloplacha.2011.10.004

Language：English   Publishing type：Research paper (scientific journal)  

This paper discusses the influence of the geological
setting of islands and reefs in the Maldives on the
impact of the 26 December 2004 Indian Ocean Tsunami.
Geological and geomorphological data (including orientation,
location, size, ellipticity, reef-island distance, proportion
of reef area to island area) were collected for
completely flooded and\25% flooded islands. The results
show that although the different parameters may interact to
reduce or magnify the impact, the reef-island distance is
the most important factor. The critical minimum distance
between the reef and the island shoreline required for the
wave to set up is estimated as 89 m on the eastern and
140 m on the western sides of the island, respectively.
Circular islands with short reef-island distance and small
percent of reef area seem to be safer in the context of
tsunami. The result of this study can be applied to identify
islands that are naturally protected/resilient against natural
disasters such as tsunami and those where the hazard is
greatest.

DOI： 10.1007/s10064-010-0278-y

Language：English   Publishing type：Research paper (scientific journal)  

The chronicles of the Ryukyu Kingdom describe at least four coastal inundation events at Ishigaki
Island during the seventeenth through nineteenth centuries: the 1771 Meiwa earthquake tsunami, which
killed 12,000 people; another earthquake tsunami (1687); and two events with unrecorded causes (1625
and 1714). We used a high‐resolution U/Th method to date well‐preserved surface parts of massive Porites
spp. coral head boulders that had been cast ashore and found that the ages of two boulders correspond to
the 1771 event. One large Porites boulder (diameter > 4 m) was dated to 1625, suggesting that that event
was also a large inundation event. Calibrated 14C ages, based on a newly estimated local value for the
radiocarbon marine reservoir effect, clustered around 1625 and 1771, suggesting that these events were
larger than the others. Our study demonstrated that Porites boulders have enormous potential value for
studies of paleoinundation events such as tsunamis and extreme storms.

DOI： 10.1029/2009GC002893

Language：English   Publishing type：Research paper (scientific journal)  

The Meiwa Tsunami, one of the largest tsunamis recorded in historical documents in Japan struck Ishigaki Island and neighboring
islands of the Ryukyu Arc in April 1771 AD, killing more than 12 000 people. An enormous number of massive Porites coral boulders are
scattered on the shore and in the reef moat of eastern Ishigaki Island. Although these boulders likely were cast ashore by the Meiwa
Tsunami, a detailed examination has not yet been conducted. When the marine reservoir effect is taken into account, one of mode values
of calibrated radiocarbon dates possibly corresponds to the time of the 1771 event. However, the range of calibrated radiocarbon ages
indicates that the transport of the boulders cannot be ascribed solely to the tsunami. Oxygen isotope microprofiling, which indicates seasurface
temperature variation, was therefore conducted to further investigate the mechanism of transport. The results suggest that the
skeletal growth of most coral colonies was interrupted in summer or autumn; hence, tropical storms and typhoons are also very likely to
be agents of transport. Thus, by combining radiocarbon dating with oxygen isotope microprofiling to investigate Porites coral boulders,
it is possible to separate paleotsunami boulders from those transported by storm events as far as tsunamis occurred during the non-storm
season.

DOI： 10.1016/j.quageo.2007.12.002

Language：English   Publishing type：Research paper (scientific journal)  

Following the tsunami caused by the Sumatra-Andaman earthquake of 26
December 2004, the Republic of Maldives reported 82 confirmed deaths, 26 people
missing and more than 3,997 incidents of house/building damage. Such an experience
suggests that all atoll nations/districts in the Pacific and Indian Oceans face a potential
risk of severe tsunami-induced damage, and an understanding of what occurred may help
us to form a basis for recognizing the safer areas of land on atoll islands.
To this end, we investigated 43 islands in the northern-to-southern Maldives by
measuring watermarks and profiles across the islands, and interviewing local residents to
determine the characteristics of the tsunami and evacuation procedures.
The movement and influence of the tsunami varied by atoll and island topography.
In the northern Maldives where the atoll rims consist of numerous faroes and are
interrupted by many channels, the tsunami entered the lagoons through these channels
and appeared to set-up the lagoon water level. The backwash of the lagoon water to the
open ocean caused inundation of the lagoon-side villages on islands at the eastern atoll
rim. Beach ridges developed on the eastern side of these islands acted as breakwaters
against the tsunami from the east. In contrast, catastrophic damage and high run-up levels
of 3.6 m above Mean Sea Level (MSL) at maximum water depth occurred on the eastern
islands in atolls with a continuous atoll rim in the southern Maldives. Damage on the
western atoll rims and in the lagoons was relatively small. The continuous eastern atoll
rim and its islands acted as a breakwater against the tsunami from the east. The eastern
islands in atolls in the central Maldives where the atoll rim is moderately interrupted by
channels were hit by both the direct surge from the east and floodwater from the lagoon.
Less damage was reported from the far southern atolls where major channels cut across
the atoll chain.
The movement of the tsunami in atolls thus differed according to the distribution
of the atolls in the archipelago and the continuity of atoll rims against the incoming
direction of the tsunami. The disaster status on individual islands also differed according
to the location of islands on atolls, height of islands, and development of beach ridges
and associated topographic zones.
It is generally understood that the Indian Ocean tsunami arrived without any
forerunning phenomena in areas located west of tsunami source area. However, according
to the results of our interviews in the southern Maldives, the following forerunning
phenomena were in fact observed: 1) loud noises (from 2-to-10 minutes before the
tsunami); 2) bubbling reef flat water (from 2-to-10 minutes before the tsunami); and 3)
the thrusting up of house floors or the bottoms of concrete wells (a few-to-10 seconds
before the maximum tsunami surge). Refuge taken in branched trees and in the lee of
strong walls was especially effective on low-lying atoll islands. Fishing boats (dhonis)
played an important role in the rescue of people swept into lagoons. It is hoped that the
collation of detailed information on the December 2004 tsunami events and disaster
measures taken in this report will contribute to a better understanding of the risks faced
by atoll nations, as well as to risk management development.

Language：English  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (international conference proceedings)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (international conference proceedings)  

Publisher：Marine Geology  

Tropical cyclones (TCs) are among the most destructive hydrodynamic disturbances, yet our knowledge of their long-term climatology is limited by the short length of observational records. Geological records provide valuable insights into TC activity before modern observation. Although the western North Pacific (WNP) is the most active TC basin, little is known about how intense TCs have responded to long-term climate variability. Here, this study presents a new two-millennia record of intense TC activity from coastal boulder deposits on Amami-Oshima Island in the Ryukyu Islands, Japan. The results indicate reduced TC activity during colder periods, including the Late Antique Little Ice Age (LALIA; 540–660 CE) and the Little Ice Age (LIA; 1400–1700 CE), and increased activity from the end of cold periods to warm periods, including the Medieval Climate Anomaly (MCA; 950–1250 CE) and the Current Warm Period (CWP; 1850 CE–present). Our integration of paleo-TC and paleoclimate records shows that TC activity had been synchronously activated during warm periods at middle latitudes in the WNP; however, it had been enhanced during the LIA at low latitudes. These meridional anti-phase patterns are likely driven by the variability in air and sea surface temperature and associated shifts in the Hadley circulation. Given the unprecedented rise in global mean temperature, ongoing climate change may drive significant changes in TC behavior, potentially mirroring or exceeding past warm-period trends.

DOI： 10.1016/j.margeo.2025.107612

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Scopus

Language：Japanese   Publisher：The Association of Japanese Geographers  

<p>1．はじめに</p><p>　沿岸浅海域は陸上地質と海域地質をつなぐ重要な地域であるが、大型調査船が近づけない沿岸浅海域は地形・地質調査の空白域として残されたままである。能登半島では東部で沿岸から5～7km、七尾湾では湾奥部から20kmの空白域が存在する。一方、能登半島北岸では半島北西岸沖を震源域とした平成19年能登半島地震（2007年3月25日，M 6.9）の発生後、沿岸近くまで及ぶ詳細な海底地質調査が実施された（井上・岡村，2010）。しかし、沿岸近くの探査は難しく、海岸から1～2.5kmの幅で空白域が残る。</p><p>　岩石海岸に接する浅海域では、侵食営力が作用して岩盤が露出する侵食地形であることが多い（たとえば，菅ほか2023）。海域の地質調査は通常、音波探査と堆積物等の試料採取（ドレッジおよびコア試料採取）によるため、岩盤が露出した海底は音波探査による地層の判別が難しい。中新世堆積岩類（南志見沖層群）と音響基盤との境界は海底地形の起伏を基に推定されており、音響基盤は主に火成岩類よりなると推定されている。輪島の北21～23kmに位置する七ツ島周辺にも空白域が存在するほか、周辺の地質は「音響基盤」である。輪島と七ツ島の間，距離にして23kmのうち、堆積物が堆積する（すなわち、海洋地質が記載される）海域は約4割程度である。</p><p></p><p>2．沿岸浅海域のマルチビーム測深と潜水地質調査</p><p>　我々は2024年4～5月に能登半島北岸の約42㎢でマルチビーム測深機R2Sonic2022を用いた海底地形測量を実施し、0.5mおよび1mグリッドの高解像度海底地形図を作成した（例 https://isgs.kyushu-u.ac.jp/~seafloor/noto/）。その後、同年6月と8～9月に測深海域で28回の潜水調査を実施した。また、水中ドローンを用いた観察も21カ所で実施した。狙いを定めたポイントへ潜行する潜水調査やROV調査には、高解像度マルチビーム測深データは必須である。</p><p>　本研究では沿岸浅海域の地形・地質に関して多くの新たな知見を得た。輪島北西沖にはWSW-ENE方向に約4km延びる直線的な高まりが存在し、数値地質図S-1にて主に火成岩類よりなると推定される「音響基盤」と記載されるが、潜水して岩石を採取したところ、この高まりは原地性のサンゴモ（石灰藻）を主とする石灰岩よりなることが判った。また、その南側、海岸との間（幅約1.5km）は珪質シルト岩よりなるが、石灰質のマトリクスを含む珪質シルト岩や珪藻質の珪質シルト岩などいくつかの岩相が認められる。このほかにも、新たに得られた知見について発表時に紹介する。</p><p></p><p>3．浅海底の地形地質調査法について</p><p>　岩盤が露出している沿岸浅海域の調査手法については、今後議論を行い、可能な方法を探ることが必要である。既存の地形図や地質図がない沿岸浅海域では、それらの作成から研究を始める必要がある。水中ではGPSが使用できず、見通しは透明度によるが、数cm～十数mである。また、減圧症等の潜水病を避けるため、深度によって潜水時間が限られている（目安として水深20ｍで約20分、水深30ｍで約10分を1日1～2回）。海況不良で調査ができない時も多い上、船舶借上や安全対策などにコストがかかるなど、陸上の調査と同様に進められないのが課題である。</p><p>　堆積物に覆われた海底ではマルチビーム測深による高解像度海底地形情報を基にした海底地形の判読と、地層探査による情報をあわせて地形・地質情報を整備し、活断層等の存在を解釈することが望まれる。</p><p></p><p>謝辞：能登半島沿岸域の調査は株式会社ワールドスキャンプロジェクト（WSP）の資金援助によって実現しました。旅費の一部には九州大学総長裁量経費（代表者 ハザリカ・へマンタ教授）を受け，潜水調査はR3～6年度科研費JP21H04379（代表者：菅　浩伸）を用いて実施しました。現地調査にご協力いただいた石川県漁業協同組合の若松拓海様，石川県漁業協同組合輪島支所統括参事の上濱敏彦様，凪紗丸船長の岩坂紀明様，まる丸船長の塩谷雅孝様，わじま海藻ラボの石川竜子様はじめ，輪島市民の方々に感謝申し上げます。</p><p></p><p>1) 井上卓彦, 岡村行信 (2010) 数値地質図S-1, 地質調査総合センター. </p><p>2) 菅　浩伸ほか（2022）玄武岩海食崖沖の海食台. 地形，42(3), 69-81.</p>

DOI： 10.14866/ajg.2025s.0_219

CiNii Research

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1017/RDC.2023.122

Language：Japanese   Publisher：The Association of Japanese Geographers  

<p>１． はじめに</p><p>　陸上の地形学では、砂岩が作る独特の地形が注目してれ記載され¹⁾、近年これらの地形用語が整理されてきた²⁾。一方、岩石海岸沖の海底地形については、いまだに研究例が乏しく、地形形成プロセスについても解明が進んでいないばかりか、どのような地形が存在するかも分かっていない。本研究では従来にない高解像度での海底地形を可視化し観察することによって、砂岩で構成される岩石海岸沖の海底でみられる地形を明らかにするとともに、それらの形成について論じる。</p><p></p><p>2．研究方法</p><p>　琉球列島・与那国島において、2017年12月に南岸域、2018年7月に北岸域を対象として、ワイドバンドマルチビーム測深機 R2 Sonic 2022 を用いた測深調査を行い、海底地形測量を行った。また、2013年および2016～2022年にかけてSCUBAを用いた潜水調査を行い、海底地形や堆積物などの観察を行った。2021年4月には、合同会社アパラティスと株式会社ワールドスキャンプロジェクトによって開発された水中３Dスキャンロボット「天叢雲剣 MURAKUMO」（特許取得済）を擁して、南東岸の新川鼻沖にてROVを利用した水中フォトグラメトリーによる1cmグリッドの高解像度海底地形モデルを作成した。本研究ではこれらの成果をあわせて海底地形に関する議論を行う。</p><p></p><p>3．海底の侵食地形</p><p>　与那国島西端の西崎および東海岸（東崎～新川鼻）沖の海底には、頂部が平坦な台地状の地形（遺跡状地形）が多数存在する。これらの地形は、一時、人工的な造形と言われたこともあったが、考古学的な遺物や人類の痕跡は検出されていない。これらの地形が分布する地域は中新統八重山層群の砂岩泥岩互層で構成されており、多数の節理が台地状地形の側面を区切っている。潜水による観察によって、岩盤の剥離、削磨作用、礫の生成などの侵食過程や、様々な形状や大きさをもつポットホールなどの侵食地形が形成されつつある様子を観察することができた。海底における砂岩の風化・削剥が継続的に進行する中で、遺跡状の地形がつくられていることを示唆している。</p><p></p><p>謝辞：本研究は科研費JP16H06309, JP21H04379（代表者：菅　浩伸）、与那国町―九州大学浅海底フロンティア研究センター間の受託研究(H29～31年度)、九州大学と株式会社ワールドスキャンプロジェクトとの共同研究および九州大学・比文・寄附講座ワールドスキャン地理情報解析講座の成果の一部です。</p><p></p><p>引用文献： 1) Wray 1997 <i>Earth-Science Reviews</i>, 42, 137-160. 2) Wray and Sauro 2017 <i>Earth-Science Reviews</i>, 171, 520-557; Migoń <i>et al.</i> 2017 <i>Earth-Science Reviews</i>, 171, 78-104; Migoń 2021 <i>Geomorphology</i>, 373, 107484など。</p>

DOI： 10.14866/ajg.2024s.0_121

CiNii Research

Language：Japanese   Publisher：The Association of Japanese Geographers  

<p>1．はじめに</p><p>　2024年1月1日、能登半島北岸を震源としたマグニチュード7.6の令和6年能登半島地震が発生し、半島北西部の海岸で最大約4ｍの隆起が生じた。能登半島北岸では4つのセグメントに分かれて存在する総延長150kmに及ぶ長大な海底活断層が存在するが¹⁾、今回の地震は全セグメントが連動して活動したことによって励起されたと考えられている²⁾。地震発生後、海底活断層の調査が東京大学大気海洋研究所³⁾や産総研地質調査総合センター⁴⁾によって実施された。しかし、大型船舶を用いた調査であったため、沿岸に近い浅海域の調査には至っていない。本研究グループは、九州大学浅海底フロンティア研究センターが得意とする浅海域の地形調査技術を用いて、能登半島北岸の沿岸域の海底地形調査を実施した。</p><p></p><p>2．沿岸浅海域のマルチビーム測深と潜水調査</p><p>　能登半島北岸における海底地形測量は、マルチビーム測深機R2Sonic2022、慣性 GPS ジャイロApplanix POS/MV OceanMasterを凪紗丸8.5トンに艤装して、2024年4月27日～5月5日の9日間に実施した。測深海域は西から1）輪島市光浦町沖（約10.9㎢）、2）輪島港周辺海域（約7.3㎢）、3）輪島市名舟町沖（約16.3㎢）、4）珠洲市片岩町沖（約6.3㎢）である。測深時の総航行距離は604.4 km、総測深面積は約42㎢、測深海域の最大水深は97mであった。</p><p>　震災後、輪島港の検潮所は被災したため、調査期間中、港内で水位ロガーHOBO U20L-04を用いて潮高の計測を行った。潮位計測のため岸壁に設けた基準点については、RTK測量器ProMark 120, L1/L2 GPS/GLONASSを使って測量し、潮位補正に使用した。測深データの収録・後処理には、統合型水路測量ソフトウェア HYPACK を用い、グリッドサイズ 0.5mおよび1 ｍの数値標高モデル（DEM）を作成した。</p><p>　SCUBA潜水は6月下旬に実施し、地形等の観察、ハンマーとタガネを用いた岩石採取、湧出気体の採取を行った。</p><p></p><p>3．輪島港周辺の海底地形</p><p>　地元漁業者への情報提供として、まず、測深海域のうち輪島港周辺の7.3㎢の海底地形図を先に完成させ、2024年7月1日に一般公開した⁵⁾。輪島港では海底の隆起によって港湾内の水深が浅くなり、浚渫作業が行われている。地元漁業関係者の間では、港湾内だけでなく港湾周辺に航行の妨げになる障害物は存在しないか、海底が極端に隆起して危険な場所はないか懸念する声があった。今回の測深によって5月上旬時点で、輪島港周辺の海底に大きな障害物はないこと、図化した海域はすべて漁船の航行に支障ない水深があることが分かった。</p><p>　輪島港沖海域の海底は、海岸から約2.5kmは泥岩を主とする堆積岩によって構成される。この海域では海底から気体が湧出するゾーンが少なくとも3列、東西方向に延びるように存在することを確認した。また海底において、きわめて最近発生したとみられる東西に連なる岩盤の破砕帯があることを発見した。発表時には、輪島港沖以外の測深海域でみられる海底地形の特徴についても言及する。</p><p></p><p>謝辞：本研究は科研費JP21H04379（代表者：菅　浩伸）、九州大学総長裁量経費（代表者 ハザリカ・へマンタ教授）および株式会社ワールドスキャンプロジェクト（WSP）の資金援助を受けて実施した。WSPの上瀧良平社長および市川泰雅技術顧問に感謝申し上げます。また、調査にご協力いただいた輪島市漁業協同組合、凪紗丸船長の岩坂紀明様、まる丸船長の塩谷雅孝様、わじま海藻ラボの石川竜子様はじめ、輪島市民の方々に感謝いたします。</p><p></p><p>1) 井上卓彦, 岡村行信 (2010) 数値地質図S-1, 地質調査総合センター 2)宍倉正展 (2024) 科学, 94(7), 608-614. 3) 東京大学大気海洋研究所（2024）https://www.aori.utokyo.ac.jp/research/news/2024/20240301.html 4) 岡村行信ほか (2024) https://www.gsj.jp/hazards/earthquake/noto2024/noto2024-10.html</p><p>5) https://isgs.kyushu-u.ac.jp/~seafloor/noto/</p>

DOI： 10.14866/ajg.2024a.0_90

CiNii Research

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1016/j.oceaneng.2023.115632

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1029/2023JF007083

Language：Japanese   Publisher：The Association of Japanese Geographers  

<p><u>１．はじめに</u> </p><p>　サンゴ礁地形は従来、航空写真で視認される低潮位付近の平坦な礁原とその陸側の浅礁湖の広がりによって認識されてきた。与那国島の海岸は、ほとんどが第三紀八重山層群の砂岩泥岩層あるいは更新世琉球層群の石灰岩からなる海食崖で構成され、航空写真から視認できる与那国島のサンゴ礁礁原は、北東岸に幅150m程度の裾礁が約2km、南岸の比川沖に幅150～500mの裾礁が約1.8kmの範囲でみられるのみである。近隣の石垣島では幅1km程度の裾礁が島のほぼ全周を取り巻き、石垣島と西表島の間には約20×15kmの広がりを持つ石西礁が発達するのとは対照的である。</p><p>　一方、高緯度の琉球列島で発達するサンゴ礁では、礁斜面（礁原の沖に広がる斜面）が熱帯域の環礁や堡礁の礁斜面より広く、緩傾斜である（堀 1980科学, 50:149-160）。礁斜面の地形やその広がりを含めてサンゴ礁地形を論じ得たとき、サンゴ礁の全体像が明らかになるとともに、各地域のサンゴ礁の特徴が再評価されるであろう。本研究では、与那国島の沿岸域におけるサンゴ礁礁斜面の広がりを明らかにすることを試みた。島の周囲にわたって、サンゴ礁礁斜面の地形とその分布について明らかにしようとする研究は、日本で初めて、世界でもほとんど行われていない。 </p><p></p><p><u>２．調査地域と研究方法</u><u></u> </p><p>　琉球列島・与那国島において、2017年12月に南岸域、2018年7月に北岸域を対象として、ワイドバンドマルチビーム測深機（R2 Sonic 2022）を用いて浅海域の海底地形測量を行った。測深域は水深1.2m～382.1mであるが、概ね水深１５０m程度までの海域を対象とした。測深結果は３次元可視化ソフトウェアFledermausにて可視化した。また、2016～2022年にSCUBAを用いた潜水調査を行い、海底地形や堆積物などの観察を行った。</p><p></p><p><u>３．与那国島のサンゴ礁地形</u> </p><p>　与那国島では裾礁の発達する2海域で、広大な礁斜面の広がりが認められた。</p><p>　北東岸の祖納―東崎間の沿岸約4kmにわたって、岸沖方向約500mの大規模なサンゴ礁地形が認められた。ここでは水深25m以浅の海域でサンゴ礁地形の広がりが顕著であり、比較的穏やかな海域でみられるタイプの礁地形およびサンゴ群集が発達する。北東岸の沖には、水深10m以浅の浅瀬ナカビシ（中干瀬）が直径約1kmの範囲に広がる。ナカビシの北側には水深20～45mの崖が800mにわたって続くが、この崖は八重山層群の侵食地形とみられる。また、ナカビシ北側に数本の明瞭な溝状地形がみられるが、溝の間隔（40～70m）はサンゴ礁の縁脚縁溝より広いこと、溝の周囲が極めて平坦な地形であり、造礁サンゴの累重した痕跡が乏しいことから、ナカビシは八重山層群の堆積岩によってその概形がつくられているとみられる。サンゴ礁の地形はナカビシの南部より島側で認められる。北東岸には裾礁の400mほど沖に、頂部水深15mに達するサンゴ礁列が礁縁と平行にみられ、ダブルリーフの地形を呈する。リーフ間には礁性砂が堆積する。</p><p>　南岸の比川沖では、礁斜面の地形が礁縁沖約500mの範囲で認められる。礁縁付近では縁溝の上部がサンゴの成長によって塞がれたリーフトンネルが多数並走する。リーフトンネルの内部は円磨されたサンゴ巨礫と、それによって研磨された縁溝壁がみられる。ここでは北海岸と対照的に、強波浪環境下でつくられるサンゴ礁地形が存在する。</p><p></p><p>謝辞：本研究はH28-R2年度科研費 基盤研究(S) JP16H06309, R3-6年度基盤研究(A) JP21H04379およびH29～31年度の那国町―九州大学浅海底フロンティア研究センター間の受託研究（いずれも代表者：菅　浩伸）の成果の一部です。</p>

DOI： 10.14866/ajg.2023s.0_225

CiNii Research

Publisher：International Journal of Nautical Archaeology  

USS Emmons is an American Second World War battleship of that sunk off Kouri Island in Okinawa, Japan, as a result of participating in the Battle of Okinawa in 1945. It was attacked by Kamikaze Special Attack Units and became inoperable. A high-quality 3D Structure-from-Motion (SfM) model was created that served to plan diver-based investigations and record the current state of the site. Together with the war-related documents from US and Japan, this research has revealed scientific evidence that has been used to reconstruct the battle of Emmons and the kamikaze planes.

DOI： 10.1080/10572414.2021.2018870

Web of Science

Scopus

Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： doi.org/10.3755/jcrs.22.7

Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： doi.org/10.3755/jcrs.22.19

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (international conference proceedings)  

Language：English   Publishing type：Research paper (international conference proceedings)  

DOI： 10.1142/9789811204487_0089

Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (international conference proceedings)  

Language：English   Publishing type：Research paper (international conference proceedings)  

Language：English   Publishing type：Research paper (international conference proceedings)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (international conference proceedings)  

Language：English   Publishing type：Research paper (scientific journal)  

Responsible for pages：p.222-235.   Language：Japanese   Book type：General book, introductory book for general audience

Responsible for pages：p.940-945.   Language：English   Book type：Scholarly book

Responsible for pages：479pp   Language：English   Book type：Scholarly book

Responsible for pages：p.59-84.   Language：Japanese   Book type：Scholarly book

Responsible for pages：p.79-85.   Language：Japanese   Book type：Scholarly book

Responsible for pages：p255-258.   Language：Japanese   Book type：General book, introductory book for general audience

Total pages：281  

CiNii Research

Total pages：143  

CiNii Research

Responsible for pages：p.90-91.   Language：Japanese   Book type：General book, introductory book for general audience

Event date： 2017.9

Language：English   Presentation type：Symposium, workshop panel (public)  

Venue：Sydney University, Sydney   Country：Australia  

Event date： 2017.9

Language：English   Presentation type：Symposium, workshop panel (public)  

Venue：Sydney University, Sydney   Country：Australia  

Event date： 2017.9

Language：English   Presentation type：Symposium, workshop panel (public)  

Venue：Sydney University, Sydney   Country：Australia  

Event date： 2017.6

Language：English   Presentation type：Oral presentation (general)  

Venue：Helsingør   Country：Denmark  

Event date： 2017.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：筑波大学   Country：Japan  

Event date： 2016.12

Language：English   Presentation type：Oral presentation (general)  

Venue：那覇市・タイムスビル   Country：Japan  

Event date： 2016.11 - 2016.12

Language：English   Presentation type：Oral presentation (general)  

Venue：Fremantle, Western Australia   Country：Australia  

Event date： 2016.6 - 2016.7

Language：English   Presentation type：Oral presentation (general)  

Venue：Pacifico Yokohama   Country：Japan  

Event date： 2016.6

Language：English   Presentation type：Oral presentation (general)  

Venue：Hawaii Convention Center   Country：United States  

Event date： 2016.6

Language：English   Presentation type：Oral presentation (general)  

Venue：Hawaii Convention Center   Country：United States  

Event date： 2016.6

Language：English   Presentation type：Oral presentation (general)  

Venue：Hawaii Convention Center   Country：United States  

Event date： 2016.5

Language：English   Presentation type：Oral presentation (general)  

Venue：幕張メッセ国際会議場   Country：Japan  

Event date： 2016.5

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：幕張メッセ国際会議場   Country：Japan  

Event date： 2016.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：早稲田大学   Country：Japan  

Event date： 2015.7 - 2015.8

Language：English   Presentation type：Oral presentation (general)  

Venue：Nagoya Congress Center   Country：Japan  

Event date： 2015.7 - 2015.8

Language：English   Presentation type：Oral presentation (general)  

Venue：Nagoya Congress Center   Country：Japan  

Event date： 2015.7 - 2015.8

Language：English   Presentation type：Oral presentation (general)  

Venue：Nagoya Congress Center   Country：Japan  

Event date： 2015.7 - 2015.8

Language：English   Presentation type：Oral presentation (general)  

Venue：Nagoya Congress Center   Country：Japan  

Event date： 2015.7 - 2015.8

Language：English   Presentation type：Oral presentation (general)  

Venue：Nagoya Congress Center   Country：Japan  

Event date： 2015.5

Language：English   Presentation type：Oral presentation (general)  

Venue：幕張メッセ国際会議場   Country：Japan  

The geomorphology of shallow coastal regions has been modulated by repeated subaerial and submarine processes during glacio-eustatic sea-level change. However, in contrast to the vast knowledge that has been accumulated regarding terrestrial landforms, few previous studies have dealt with shallow seafloor landforms, which represent former terrestrial landscapes modified by present marine processes, from a geomorphological perspective.A broadband multibeam echosounder (Sonic 2022, R2 Sonic, LLC) and its accessory system were introduced to H. Kan’s laboratory in 2010 using JSPS Grant-in-Aid for Scientific Research A. We have carried out our bathymetric survey in Kume, Ishigaki, Kikai Islands and the southeastern and northwestern coasts of Okinawa Island in the Ryukyus, southwestern Japan since 2010.The Sonic 2022 has a variable ultrasonic frequency of 200 to 400 kHz, 256 ultrasonic beams and selectable swath coverage of 10 to 160 degrees. The typical ultrasonic beam widths parallel and orthogonal to the direction of travel are within one degree of each other when an ultrasonic frequency of 400 kHz is selected. We used a VS111 GPS compass system with A20 and A30 antennas (Hemisphere Inc.) combined with a dynamic motion sensor (DMS-10, Teledyne TSS Ltd.), a sea surface sound velocity sensor (miniSVS, Valeport Ltd.), a sound velocity profiler (MicroSVP, AML Oceanographic Ltd.). Overlap of at least ~20% (typically ~50%) was implemented throughout the bathymetric survey to ensure 100% coverage of the surveyed area. The minimum and maximum depth was 1m and 400m, respectively. The HYPACK2010 software was used for both hydrographic survey and data processing. IVS3D Fledermaus was used for three-dimensional visualization. We conducted geomorphological studies of the coastal seafloor in the coral reef areas of the Ryukyu Islands based on our high-resolution bathymetric map with a grid size of 1 m combined with SCUBA diving observations. For example, the submerged tropical karst features were discovered in Nagura Bay, Ishigaki Island (Kan et al. 2015). This is the first description of submerged humid tropical karst using multibeam bathymetry. Along with the geomorphological studies, we have also started biological and archeological studies in our bathymetric areas to promote interdisciplinary researches which link natural and human sciences.

Event date： 2015.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：日本大学   Country：Japan  

Event date： 2014.12

Language：English   Presentation type：Oral presentation (general)  

Venue：Moscone Convention Center, San Francisco   Country：United States  

Submerged tropical karst features were discovered in Nagura Bay on Ishigaki Island in the South Ryukyu Islands, Japan. This is the first description of submerged humid tropical karst using multibeam bathymetry. We conducted a broadband multibeam survey in the central area of Nagura Bay (1.85 × 2.7 km) and visualized the high-resolution bathymetric results with a grid size of 1 m over a depth range of 1.6–58.5 m. Various types of humid tropical karst landforms were found to coexist within the bay, including fluviokarst, doline karst, cockpit karst, polygonal karst, uvalas, and mega-dolines.
We assume that Nagura Bay was a large karst basin in which older limestone remained submerged, thus preventing corrosion and the accumulation of reef sediments during periods of submersion, whereas the limestone outcropping on land was corroded during multiple interglacial and glacial periods. Based on our bathymetric result together with aerial photographs of the coastal area, we conclude that the submerged karst landscape has likely developed throughout the whole of Nagura Bay, covering an area of ~6 × 5 km. Accordingly, this area hosts the largest submerged karst in Japan.
We also observed abundant coral communities during our SCUBA observations. The present marine conditions of Nagura Bay are characterized by low energy (calm sea) and low irradiance owing to the terrestrial influence. Such conditions have been emphasized by the presence of large undulating landforms, which cause decreases in wave intensity and irradiance with depth. These characteristics have acted to establish unique conditions compared to other coral reef areas in the Ryukyu Islands. It may play an important role in supporting the regional coral reef ecosystem.

Event date： 2014.11 - 2014.12

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：高知城ホール   Country：Japan  

Event date： 2025.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：駒澤大学（駒沢キャンパス）   Country：Japan  

Event date： 2025.2

Language：Japanese   Presentation type：Public lecture, seminar, tutorial, course, or other speech  

Venue：石垣市民会館大ホール  

Event date： 2025.2

Language：Japanese   Presentation type：Public lecture, seminar, tutorial, course, or other speech  

Venue：熊本大学合津マリンステーション   Country：Japan  

Event date： 2025.2

Language：Japanese   Presentation type：Public lecture, seminar, tutorial, course, or other speech  

Venue：九州大学イースト1号館   Country：Japan  

Event date： 2025.1

Language：Japanese  

Venue：福岡市リファレンス駅東ビル   Country：Japan  

Event date： 2025.1

Language：Japanese   Presentation type：Public lecture, seminar, tutorial, course, or other speech  

Venue：リファレンス駅東ビル(福岡市博多区)   Country：Japan  

Event date： 2024.12

Language：Japanese   Presentation type：Public lecture, seminar, tutorial, course, or other speech  

Venue：唐津市民交流プラザ   Country：Japan  

Event date： 2024.11 - 2024.12

Language：English   Presentation type：Oral presentation (general)  

Venue：宮崎市民プラザ   Country：Japan  

Event date： 2024.11 - 2024.12

Language：Japanese   Presentation type：Poster presentation  

Venue：宮崎市民プラザ   Country：Japan  

Event date： 2024.11

Language：Japanese   Presentation type：Public lecture, seminar, tutorial, course, or other speech  

Venue：アマホームPLAZA(奄美市市民交流センター)   Country：Japan  

Event date： 2024.10

Venue：JR博多シティ会議室   Country：Japan  

Event date： 2024.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：南山大学   Country：Japan  

Event date： 2024.9

Language：Japanese   Presentation type：Public lecture, seminar, tutorial, course, or other speech  

Event date： 2024.9

Language：Japanese   Presentation type：Public lecture, seminar, tutorial, course, or other speech  

Venue：与那国町複合型公共施設・オンライン併用   Country：Japan  

Event date： 2024.7

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：久留米大学 福岡サテライト   Country：Japan  

Event date： 2024.7

Language：Japanese   Presentation type：Oral presentation (general)  

Event date： 2024.6

Language：Japanese   Presentation type：Public lecture, seminar, tutorial, course, or other speech  

Venue： JR博多シティ会議室   Country：Japan  

Event date： 2024.6

Language：Japanese  

Venue：九州大学共進化社会システムイノベーション施設   Country：Japan  

Event date： 2024.5

Language：Japanese   Presentation type：Public lecture, seminar, tutorial, course, or other speech  

Venue：株式会社イノカ 本社   Country：Japan  

Event date： 2024.5

Language：English   Presentation type：Oral presentation (general)  

Venue：Arendal   Country：Norway  

Event date： 2024.5

Language：English  

Venue：Arendal, Norway   Country：Norway  

Event date： 2024.4

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：熊本大学   Country：Japan  

Event date： 2024.4

Language：Japanese  

Venue：熊本大学  

Event date： 2024.4

Language：Japanese  

Country：Japan  

Event date： 2024.3

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2024.3

Language：English   Presentation type：Oral presentation (general)  

Venue：青山学院大   Country：Japan  

Event date： 2024.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：青山学院大   Country：Japan  

Event date： 2024.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：青山学院大   Country：Japan  

Event date： 2024.1

Language：Japanese   Presentation type：Symposium, workshop panel (public)  

Venue：JR博多シティ会議室   Country：Japan  

Event date： 2024.1

Language：Japanese   Presentation type：Symposium, workshop panel (public)  

Venue：JR博多シティ会議室   Country：Japan  

Event date： 2024.1

Language：Japanese   Presentation type：Symposium, workshop panel (public)  

Venue：JR博多シティ会議室   Country：Japan  

Event date： 2024.1

Language：Japanese   Presentation type：Symposium, workshop panel (public)  

Venue：JR博多シティ会議室   Country：Japan  

Event date： 2024.1

Language：Japanese   Presentation type：Symposium, workshop panel (public)  

Venue：JR博多シティ会議室   Country：Japan  

Event date： 2024.1

Language：Japanese   Presentation type：Symposium, workshop panel (public)  

Venue：JR博多シティ会議室   Country：Japan  

Event date： 2024.1

Language：Japanese   Presentation type：Symposium, workshop panel (public)  

Venue：JR博多シティ会議室   Country：Japan  

Event date： 2024.1

Language：Japanese   Presentation type：Symposium, workshop panel (public)  

Venue：JR博多シティ会議室   Country：Japan  

Event date： 2023.11

Language：English   Presentation type：Oral presentation (general)  

Venue：仙台、東北大学   Country：Japan  

Event date： 2023.11

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：東北大学   Country：Japan  

Event date： 2023.11

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：東北大学   Country：Japan  

Event date： 2023.11

Language：English   Presentation type：Oral presentation (general)  

Venue：Gwangju   Country：Korea, Republic of  

Event date： 2023.7

Language：English  

Venue：University of Rome   Country：Italy  

Event date： 2023.7

Language：English  

Venue：University of Rome   Country：Italy  

Event date： 2023.6

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：豊橋市自然史博物館   Country：Japan  

Event date： 2023.5

Language：English   Presentation type：Oral presentation (general)  

Venue：千葉   Country：Japan  

Event date： 2023.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：東京都立大学   Country：Japan  

Event date： 2023.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：東京都立大学   Country：Japan  

Event date： 2023.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：東京都立大学   Country：Japan  

Event date： 2023.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：東京都立大学   Country：Japan  

Event date： 2023.1

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：唐津市大手口センタービル・多目的ホール   Country：Japan  

Event date： 2023.1

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：九州大学共進化社会イノベーション施設大会議室   Country：Japan  

Event date： 2023.1

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：九州大学共進化社会イノベーション施設大会議室   Country：Japan  

Event date： 2023.1

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：九州大学共進化社会イノベーション施設大会議室   Country：Japan  

Event date： 2023.1

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：九州大学共進化社会イノベーション施設大会議室   Country：Japan  

Event date： 2023.1

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：九州大学共進化社会イノベーション施設大会議室   Country：Japan  

Event date： 2023.1

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：九州大学共進化社会イノベーション施設大会議室   Country：Japan  

Event date： 2022.12

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：奄美市市民交流センター・マチナカホール   Country：Japan  

Event date： 2022.11

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：沖縄県石垣島   Country：Japan  

Event date： 2022.11

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：沖縄県石垣島   Country：Japan  

Event date： 2022.11

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：北海道大学農学部   Country：Japan  

Event date： 2022.10

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：石垣市役所   Country：Japan  

Event date： 2022.9

Language：English   Presentation type：Oral presentation (general)  

Venue：Coimbra   Country：Portugal  

Event date： 2022.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：オンライン   Country：Japan  

Event date： 2022.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：東京大学（オンライン開催）   Country：Japan  

Event date： 2022.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：東京大学（オンライン開催）   Country：Japan  

Event date： 2022.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：東京大学（オンライン開催）   Country：Japan  

Event date： 2022.1

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：九州大学共進化社会イノベーション施設大会議室または、オンライン   Country：Japan  

Event date： 2022.1

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：九州大学共進化社会イノベーション施設大会議室または、オンライン   Country：Japan  

Event date： 2022.1

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：九州大学共進化社会イノベーション施設大会議室または、オンライン   Country：Japan  

Event date： 2022.1

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：九州大学共進化社会イノベーション施設大会議室または、オンライン   Country：Japan  

Event date： 2022.1

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：九州大学共進化社会イノベーション施設大会議室または、オンライン   Country：Japan  

Event date： 2021.11

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：オンライン   Country：Japan  

Event date： 2021.11

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2021.11

Language：English   Presentation type：Oral presentation (general)  

Venue：オンライン   Country：Australia  

Event date： 2021.8

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：オンライン   Country：Japan  

Event date： 2021.5 - 2021.6

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：オンライン   Country：Japan  

Event date： 2021.5 - 2021.6

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：オンライン   Country：Japan  

Event date： 2021.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：オンライン   Country：Japan  

Event date： 2021.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：オンライン   Country：Japan  

Event date： 2021.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：九州大学共進化社会イノベーション施設大会議室または、オンライン   Country：Japan  

Event date： 2021.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：九州大学共進化社会イノベーション施設大会議室または、オンライン   Country：Japan  

Event date： 2021.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：九州大学共進化社会イノベーション施設大会議室または、オンライン   Country：Japan  

Event date： 2021.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：九州大学共進化社会イノベーション施設大会議室または、オンライン   Country：Japan  

Event date： 2021.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：九州大学共進化社会イノベーション施設大会議室または、オンライン   Country：Japan  

Event date： 2021.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：九州大学共進化社会イノベーション施設大会議室または、オンライン   Country：Japan  

Event date： 2021.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：九州大学共進化社会イノベーション施設大会議室または、オンライン   Country：Japan  

Event date： 2021.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：九州大学共進化社会イノベーション施設大会議室または、オンライン   Country：Japan  

Event date： 2020.11

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：オンライン   Country：Japan  

Event date： 2020.7

Language：English   Presentation type：Oral presentation (general)  

Venue：オンライン   Country：Japan  

Event date： 2020.7

Language：English   Presentation type：Oral presentation (general)  

Venue：オンライン   Country：Japan  

Event date： 2020.7

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：オンライン   Country：Japan  

Event date： 2020.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：駒沢大学, 東京   Country：Japan  

Event date： 2020.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：駒沢大学, 東京   Country：Japan  

Event date： 2020.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：駒沢大学, 東京   Country：Japan  

Event date： 2020.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：駒沢大学, 東京   Country：Japan  

Event date： 2020.1

Language：Japanese   Presentation type：Symposium, workshop panel (public)  

Venue：九州大学共進化社会イノベーション施設大会議室，福岡   Country：Japan  

Event date： 2020.1

Language：Japanese   Presentation type：Symposium, workshop panel (public)  

Venue：九州大学共進化社会イノベーション施設大会議室，福岡   Country：Japan  

Event date： 2020.1

Language：Japanese   Presentation type：Symposium, workshop panel (public)  

Venue：九州大学共進化社会イノベーション施設大会議室，福岡   Country：Japan  

Event date： 2020.1

Language：English   Presentation type：Symposium, workshop panel (public)  

Venue：九州大学共進化社会イノベーション施設大会議室，福岡   Country：Japan  

Event date： 2020.1

Language：Japanese   Presentation type：Symposium, workshop panel (public)  

Venue：九州大学共進化社会イノベーション施設大会議室，福岡   Country：Japan  

Event date： 2020.1

Language：Japanese   Presentation type：Symposium, workshop panel (public)  

Venue：九州大学共進化社会イノベーション施設大会議室，福岡   Country：Japan  

Event date： 2020.1

Language：Japanese   Presentation type：Symposium, workshop panel (public)  

Venue：九州大学共進化社会イノベーション施設大会議室，福岡   Country：Japan  

Event date： 2020.1

Language：Japanese   Presentation type：Symposium, workshop panel (public)  

Venue：九州大学共進化社会イノベーション施設大会議室，福岡   Country：Japan  

Event date： 2020.1

Language：Japanese   Presentation type：Symposium, workshop panel (public)  

Venue：九州大学　椎木講堂   Country：Japan  

Event date： 2019.12

Language：English   Presentation type：Oral presentation (general)  

Venue：San Francisco  

Event date： 2019.11

Language：Japanese   Presentation type：Symposium, workshop panel (public)  

Venue：与那国町DIDI交流館   Country：Japan  

Event date： 2019.11

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：北海道大学   Country：Japan  

Event date： 2019.11

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：北海道大学   Country：Japan  

Event date： 2019.10 - 2012.10

Language：Japanese   Presentation type：Symposium, workshop panel (public)  

Venue：喜界島役場   Country：Japan  

Event date： 2019.9

Language：English   Presentation type：Oral presentation (general)  

Venue：熊本大学   Country：Japan  

Event date： 2019.5

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：幕張メッセ国際会議場   Country：Japan  

Event date： 2019.5

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：幕張メッセ国際会議場   Country：Japan  

Event date： 2019.5

Language：English   Presentation type：Oral presentation (general)  

Venue：幕張メッセ国際会議場   Country：Japan  

Event date： 2019.5

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：幕張メッセ国際会議場   Country：Japan  

Event date： 2019.5

Language：English   Presentation type：Oral presentation (general)  

Venue：幕張メッセ国際会議場   Country：Japan  

Event date： 2019.5

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：幕張メッセ国際会議場   Country：Japan  

Event date： 2019.5

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：幕張メッセ国際会議場   Country：Japan  

Event date： 2019.5

Language：English   Presentation type：Oral presentation (general)  

Venue：幕張メッセ国際会議場   Country：Japan  

Event date： 2019.5

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：幕張メッセ国際会議場   Country：Japan  

Event date： 2019.4

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：大阪市立自然史博物館   Country：Japan  

Event date： 2019.3

Language：Japanese  

Venue：専修大学   Country：Japan  

Event date： 2019.3

Language：Japanese  

Venue：専修大学   Country：Japan  

Event date： 2019.3

Language：Japanese  

Venue：専修大学   Country：Japan  

Event date： 2019.1

Language：Japanese  

Venue：福岡大学   Country：Japan  

Event date： 2019.1

Language：English  

Country：Japan  

Event date： 2019.1

Language：Japanese   Presentation type：Symposium, workshop panel (public)  

Venue：九州大学   Country：Japan  

Event date： 2019.1

Language：Japanese   Presentation type：Symposium, workshop panel (public)  

Venue：九州大学   Country：Japan  

Event date： 2019.1

Language：English  

Venue：St. Charles Convention Center in Saint Charles  

Event date： 2018.12

Language：Japanese   Presentation type：Symposium, workshop panel (public)  

Venue：九州大学   Country：Japan  

Event date： 2018.11

Language：Japanese  

Venue：琉球大学   Country：Japan  

Event date： 2018.11

Language：Japanese  

Venue：琉球大学   Country：Japan  

Event date： 2018.9 - 2018.10

Language：English   Presentation type：Oral presentation (general)  

Venue：Biograd na moru   Country：Croatia  

Event date： 2018.9

Language：English   Presentation type：Symposium, workshop panel (public)  

Venue：九州大学   Country：Japan  

Event date： 2018.9

Language：English   Presentation type：Symposium, workshop panel (public)  

Venue：九州大学   Country：Japan  

Event date： 2018.9

Language：English   Presentation type：Symposium, workshop panel (public)  

Venue：九州大学   Country：Japan  

Event date： 2018.9

Language：English   Presentation type：Symposium, workshop panel (public)  

Venue：九州大学   Country：Japan  

Event date： 2018.9

Language：English   Presentation type：Symposium, workshop panel (public)  

Venue：九州大学   Country：Japan  

Event date： 2018.9

Language：English   Presentation type：Symposium, workshop panel (public)  

Venue：九州大学   Country：Japan  

Event date： 2018.9

Language：English   Presentation type：Symposium, workshop panel (public)  

Venue：九州大学   Country：Japan  

Event date： 2018.6

Language：Japanese  

Venue：九州大学   Country：Japan  

Event date： 2018.1

Presentation type：Symposium, workshop panel (public)  

Venue：九州大学   Country：Japan  

Event date： 2015.1

Language：English   Presentation type：Oral presentation (general)  

Venue：Palm Beach County Convention Center, Florida   Country：United States  

Event date： 2014.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：富山大学   Country：Japan  

Event date： 2014.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：東京大学柏キャンパス   Country：Japan  

Event date： 2014.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：東京大学大気海洋研究所   Country：Japan  

Event date： 2014.9

Language：English   Presentation type：Oral presentation (general)  

Venue：長崎県西海市西彼成年の家   Country：Japan  

Event date： 2014.5

Language：English   Presentation type：Oral presentation (general)  

Venue：Honolulu, Hawaii   Country：United States  

Yarabuoki site, which contains iron grapnel anchors and early modern Okinawa ceramic jars in 12 to 32 m depth off the western Coast of Ishigaki Island, was discovered by a local diver and reported to Okinawa Prefectural Archaeological Center. In 2010, the Center conducted a distributional survey to confirm the site and its location. Although the survey found and pictured seven numbers of grapnel anchors that were first findings of this type in Okinawa area, the previous study did not record each position and the accurate depth of these artifacts and the site character such as shipwreck site or discarded shipping loads site is yet unclear. With such background and tasks, our team has conducted underwater archaeological research to record each location of grapnel anchors and ceramic jars using GPS. Furthermore, Kan and Nagao conducted a broadband multibeam survey around the Yarabuoki site and visualized the bathymetric results at a lateral grid resolution of 1m. This will enable us to create a three- dimensional site map to plot the artifacts, while Sakagami (Tokai University) developed a low-cost and human-portable underwater robot to explore and record high resolution video of underwater sites, and the robot successfully worked during our surveys. Our paper reports the results and outcomes of the research at Yarabuoki site and other underwater sites in Ishigaki and the Yaeyama Islands and discusses the early modern marine transportations in Okinawa or the Ryukyu Islands. We also discuss the future possibility for cultural resource management of underwater cultural heritages in the Yaeyama and Okinawa.

Other Link： http://www.apconf.org/

Language：Japanese   Presentation type：Symposium, workshop panel (public)  

Venue：JR博多シティ会議室   Country：Japan  

Language：Japanese   Presentation type：Symposium, workshop panel (public)  

Venue：JR博多シティ会議室   Country：Japan  

Language：Japanese   Presentation type：Symposium, workshop panel (public)  

Venue：JR博多シティ会議室   Country：Japan  

Language：English   Presentation type：Symposium, workshop panel (public)  

Venue：JR博多シティ会議室   Country：Japan  

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：東京   Country：Japan  

Language：English   Presentation type：Oral presentation (general)  

Venue：九州大学I2CNERホール前   Country：Japan  

Language：English   Presentation type：Oral presentation (general)  

Venue：九州大学稲盛財団記念館   Country：Japan  

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：九州産業大学   Country：Japan  

Language：Japanese   Presentation type：Oral presentation (general)  

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：ベルサール新宿グランド コンファレンスセンター   Country：Japan  

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：岡山大学   Country：Japan  

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：石垣市民会館大ホール   Country：Japan  

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：九州大学椎木講堂第2講義室   Country：Japan  

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：西海市大瀬戸コミュニティセンター   Country：Japan  

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：九州大学椎木講堂大会議室   Country：Japan  

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：石垣市民会館   Country：Japan  

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：アマホームPLAZA(奄美市市民交流センター)   Country：Japan  

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：九州大学 共進化社会システムイノベーション施設　2階ホール   Country：Japan  

Language：Japanese  

Language：Japanese   Publishing type：Internal/External technical report, pre-print, etc.  

Type：Competition, symposium, etc. 

Number of participants：354

Type：Peer review 

Number of peer-reviewed articles in foreign language journals：1

Type：Competition, symposium, etc. 

Type：Competition, symposium, etc. 

Type：Competition, symposium, etc. 

Number of participants：94

Type：Competition, symposium, etc. 

Number of participants：406

Type：Peer review 

Number of peer-reviewed articles in Japanese journals：1

Type：Competition, symposium, etc. 

Number of participants：16

Type：Competition, symposium, etc. 

Number of participants：20

Type：Competition, symposium, etc. 

Type：Competition, symposium, etc. 

Type：Competition, symposium, etc. 

Number of participants：508

Type：Peer review 

Number of peer-reviewed articles in foreign language journals：1

Type：Competition, symposium, etc. 

Number of participants：60

Type：Competition, symposium, etc. 

Number of participants：20

Type：Academic society, research group, etc. 

Type：Academic society, research group, etc. 

Type：Competition, symposium, etc. 

Type：Competition, symposium, etc. 

Type：Peer review 

Number of peer-reviewed articles in foreign language journals：1

Number of peer-reviewed articles in Japanese journals：1

Type：Competition, symposium, etc. 

Number of participants：266

Type：Academic society, research group, etc. 

Type：Competition, symposium, etc.