Hiroaki Koge
YOU?
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View article: Preliminary results of bathymetric surveys undertaken northwest of Kyushu during cruises GS23 and GB23
Preliminary results of bathymetric surveys undertaken northwest of Kyushu during cruises GS23 and GB23 Open
View article: Preliminary results of geomagnetic surveys off northwest Kyushu during cruises GS23 and GB23
Preliminary results of geomagnetic surveys off northwest Kyushu during cruises GS23 and GB23 Open
View article: ERRATUM: Inception of ridge-ridge-ridge triple junctions: Morphostructural analysis and dynamics in the early back-arc extension of the northern Okinawa Trough
ERRATUM: Inception of ridge-ridge-ridge triple junctions: Morphostructural analysis and dynamics in the early back-arc extension of the northern Okinawa Trough Open
View article: Display SBP profiles with Python toolkit - example of Hakuho-maru Bathy 2010
Display SBP profiles with Python toolkit - example of Hakuho-maru Bathy 2010 Open
View article: Shallow submarine structure around Tokara Islands based on the high-resolution subbottom profiler survey during the GS22 cruise
Shallow submarine structure around Tokara Islands based on the high-resolution subbottom profiler survey during the GS22 cruise Open
View article: Supplemental Material: Inception of ridge-ridge-ridge triple junctions: Morphostructural analysis and dynamics in the early back-arc extension of the northern Okinawa Trough
Supplemental Material: Inception of ridge-ridge-ridge triple junctions: Morphostructural analysis and dynamics in the early back-arc extension of the northern Okinawa Trough Open
Detailed bathymetric images, explanations of the analytical methods and processing steps, and selected seismic reflection profiles aligned with the bathymetry.
View article: Results of the multibeam echo sounder observations on the GB21-2,3 cruises (around Tokara Islands)
Results of the multibeam echo sounder observations on the GB21-2,3 cruises (around Tokara Islands) Open
トカラ列島周辺海域の，北緯28度45分から北緯31度15分，及び東経128度50分から東経131度20分の範囲において，海域地質図作成を目的としたマルチビーム音響測深装置（MBES）を用いる航走観測を実施し，高解像度海底地形データ及び後方散乱強度データを取得し解析した．統合した地形からは，当該海域に含まれる特徴的なリッジ状の地形が，蟇曾根・南蟇曾根・権曾根・平島曾根を含む一連の高まりを形成し，その位置は沖縄トラフと島弧の境界に相当することが示唆された．後方散乱強度は，口之島…
View article: Preliminary results of the magnetic anomaly survey around Tokara Islands during the GB21-2, GB21-3, and GS21 cruises
Preliminary results of the magnetic anomaly survey around Tokara Islands during the GB21-2, GB21-3, and GS21 cruises Open
トカラ列島北部海域において，海域地球物理図作成を目的とした地磁気観測を実施し，曳航式全磁力計の観測値に基づき全磁力異常図を作成した．また昨年度のトカラ列島南部海域で取得された三成分磁気観測から算出した全磁力異常と合わせてトカラ列島全域の磁気異常図も作成した．島弧の島々及び複数の海底下の地形的高まりではダイポール型磁気異常が見られ，地形との関連から火山活動によるものと推測される．調査海域西側の南北方向に連続する地形的高まりは，地磁気・重力的特徴から火成活動を伴う沖縄トラフの東…
View article: Shallow submarine structure around Tokara Islands based on the high-resolution subbottom profiler survey during the GS21 cruise
Shallow submarine structure around Tokara Islands based on the high-resolution subbottom profiler survey during the GS21 cruise Open
2021年10月に実施したGS21航海では,東京海洋大学の神鷹丸を用いて,トカラ列島周辺海域の火山フロント域を中心に高分解能サブボトムプロファイラー(Subbottom profiler;SBP)探査を行い,海底下浅部に関する地質情報を取得した.本論では,SBP探査により明らかになったトカラ列島周辺海域の東新曾根周辺部,臥蛇島南方域,五号曾根周辺部,及び奄美舟状海盆域の海底下浅部の地質構造をまとめる.東新曾根周辺部及び臥蛇島南方域は,五号曾根周辺部と比較して断層及び海底火山…
View article: Evolution of the geological structure due to the collision of multiple basement topographic highs in a forearc accretionary wedge: insights from numerical simulations
Evolution of the geological structure due to the collision of multiple basement topographic highs in a forearc accretionary wedge: insights from numerical simulations Open
We propose a conceptual geological model for the collision of multiple basement topographic highs (BTHs; e.g., seamounts, ridges, and horsts) with a forearc accretionary wedge. Even though there are many BTHs on an oceanic plate, there are…
View article: Mbes Noise Reduction Based on Analysis of Actually Occurring Noise and Seafloor Geometric Features
Mbes Noise Reduction Based on Analysis of Actually Occurring Noise and Seafloor Geometric Features Open
View article: The bathymetry survey around Tokara Islands during GB21-1 and GK20 cruise
The bathymetry survey around Tokara Islands during GB21-1 and GK20 cruise Open
トカラ列島南部海域において,海域地質図作成を目的としたマルチビーム音響測深装置(MBES)による海底地形航走観測を実施し,高解像度海底地形図を作成した.その結果,2つの線状構造(N24°E,N73°E方向)が混在する地域であることが明らかになった.これらの線状構造はそれぞれ沖縄トラフ拡大とトカラギャップの形成に関する構造である可能性が高く,本海域は琉球弧における背弧リフト形成史の理解に重要であると考えられる.さらに海底地形が高解像度で得られたことで,横ガン海丘南部にN73°…
View article: Preliminary results of the magnetic anomaly survey around Tokara Islands during the GB21-1 and GK20 cruises
Preliminary results of the magnetic anomaly survey around Tokara Islands during the GB21-1 and GK20 cruises Open
トカラ列島南部海域において,海域地質図作成を目的とした地磁気観測を実施し,三成分磁力計の観測値に基づき全磁力異常図を作成した.全磁力の計算には東・東南アジア磁気異常図改訂版第3版を用いた補正を試みた.フラックスゲート型船上三成分磁力計の観測値が精度よく観測されていたこともあり,曳航型セシウム磁力計と同程度の全磁力値を得ることができた.さらに本手法で解析した結果には,測線交点部のエラーがほぼ存在しなかった.今回試した補正方法はセシウム磁力計の観測等でも応用できると考える.島弧…
View article: Submarine rock samples recovered during GB21-1 cruise in the southern Tokara Islands area
Submarine rock samples recovered during GB21-1 cruise in the southern Tokara Islands area Open
トカラ列島南部海域において，海域地質図作成に資する目的で，ドレッジによる海底岩石の採取を行った．火山体と考えられる海山及び海丘についてその噴出物を採取してその火山活動を理解することと，音波探査で認識された堆積物層の年代決定を主な目的として実施した．その結果，琉球弧火山フロント近傍及び沖縄トラフ内の2つの火山体で主に流紋岩及び玄武岩からなる噴出物が採取された．また断層崖と考えられる2地点で,露頭を構成する泥岩を採取した．火山岩類の全岩主成分分析を実施した結果，琉球弧の火山フロ…
View article: Simple topographic parameter reveals the along-trench distribution of frictional properties on shallow plate boundary fault
Simple topographic parameter reveals the along-trench distribution of frictional properties on shallow plate boundary fault Open
View article: Evolution of the geological structure and mechanical properties due to the collision of multiple basement topographic highs in a forearc accretionary wedge: insights from numerical simulations
Evolution of the geological structure and mechanical properties due to the collision of multiple basement topographic highs in a forearc accretionary wedge: insights from numerical simulations Open
View article: Additional file 2 of Simple topographic parameter reveals the along-trench distribution of frictional properties on shallow plate boundary fault
Additional file 2 of Simple topographic parameter reveals the along-trench distribution of frictional properties on shallow plate boundary fault Open
Additional file 2. Result_ols_A.csv; raw data for WOA plot (Fig. 4A).
View article: Additional file 4 of Simple topographic parameter reveals the along-trench distribution of frictional properties on shallow plate boundary fault
Additional file 4 of Simple topographic parameter reveals the along-trench distribution of frictional properties on shallow plate boundary fault Open
Additional file 4. Result_ols_B.csv; raw data for WOA plot (Fig. 4B).
View article: Additional file 5 of Simple topographic parameter reveals the along-trench distribution of frictional properties on shallow plate boundary fault
Additional file 5 of Simple topographic parameter reveals the along-trench distribution of frictional properties on shallow plate boundary fault Open
Additional file 5. Result_ct_B.csv; raw results for critical taper parameters (Fig. 4B).
View article: Additional file 3 of Simple topographic parameter reveals the along-trench distribution of frictional properties on shallow plate boundary fault
Additional file 3 of Simple topographic parameter reveals the along-trench distribution of frictional properties on shallow plate boundary fault Open
Additional file 3. Result_ct_A.csv; raw results for critical taper parameters (Fig. 4A).
View article: Simple Topographic Parameter Reveals the Along-Trench Distribution of Frictional Properties on a Shallow Plate Boundary Fault
Simple Topographic Parameter Reveals the Along-Trench Distribution of Frictional Properties on a Shallow Plate Boundary Fault Open
The critical taper model of a sedimentary wedge best describes the first-order mechanics of a subduction zone wedge. The tapered wedge geometry, which is conventionally defined by two parameters, the slope angle and the basal dip angle, is…
View article: Evolution of the geological structure and mechanical properties due to the collision of multiple basement topographic highs in a forearc accretionary wedge: Insights from numerical simulations
Evolution of the geological structure and mechanical properties due to the collision of multiple basement topographic highs in a forearc accretionary wedge: Insights from numerical simulations Open
We propose a conceptual geological model for the collision of multiple basement topographic highs (BTHs; e.g., seamounts, ridges, and horsts) with a forearc accretionary wedge. Even though there are many BTHs on an oceanic plate, there are…
View article: IODP Expedition 372, Hole U1518B - Well Logging Data
IODP Expedition 372, Hole U1518B - Well Logging Data Open
Logging data are measurements of physical properties of the formation surrounding a borehole, acquired in situ after completion of coring (wireline logging) or during drilling (Logging-While-Drilling, LWD). The range of data (resistivity, …
View article: IODP Expedition 372, Hole U1519A - Well Logging Data
IODP Expedition 372, Hole U1519A - Well Logging Data Open
Logging data are measurements of physical properties of the formation surrounding a borehole, acquired in situ after completion of coring (wireline logging) or during drilling (Logging-While-Drilling, LWD). The range of data (resistivity, …
View article: IODP Expedition 372, Hole U1517A - Well Logging Data
IODP Expedition 372, Hole U1517A - Well Logging Data Open
Logging data are measurements of physical properties of the formation surrounding a borehole, acquired in situ after completion of coring (wireline logging) or during drilling (Logging-While-Drilling, LWD). The range of data (resistivity, …
View article: IODP Expedition 372, Hole U1518B - Well Logging Data
IODP Expedition 372, Hole U1518B - Well Logging Data Open
Logging data are measurements of physical properties of the formation surrounding a borehole, acquired in situ after completion of coring (wireline logging) or during drilling (Logging-While-Drilling, LWD). The range of data (resistivity, …
View article: IODP Expedition 372, Hole U1520A - Well Logging Data
IODP Expedition 372, Hole U1520A - Well Logging Data Open
Logging data are measurements of physical properties of the formation surrounding a borehole, acquired in situ after completion of coring (wireline logging) or during drilling (Logging-While-Drilling, LWD). The range of data (resistivity, …
View article: IODP Expedition 372, Hole U1520B - Well Logging Data
IODP Expedition 372, Hole U1520B - Well Logging Data Open
Logging data are measurements of physical properties of the formation surrounding a borehole, acquired in situ after completion of coring (wireline logging) or during drilling (Logging-While-Drilling, LWD). The range of data (resistivity, …
View article: IODP Expedition 372, Hole U1518A - Well Logging Data
IODP Expedition 372, Hole U1518A - Well Logging Data Open
Logging data are measurements of physical properties of the formation surrounding a borehole, acquired in situ after completion of coring (wireline logging) or during drilling (Logging-While-Drilling, LWD). The range of data (resistivity, …
View article: IODP Expedition 372, Hole U1518A - Well Logging Data
IODP Expedition 372, Hole U1518A - Well Logging Data Open
Logging data are measurements of physical properties of the formation surrounding a borehole, acquired in situ after completion of coring (wireline logging) or during drilling (Logging-While-Drilling, LWD). The range of data (resistivity, …