著者

倉本 真一

出版者

一般社団法人 日本地質学会

雑誌

地質学雑誌 (ISSN:00167630)

巻号頁・発行日

vol.115, no.9, pp.483-487, 2009 (Released:2010-03-10)

参考文献数

12

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This report introduces the scientific drilling project “NanTroSEIZE (Nankai Trough Seismogenic Zone Experiment)” proposed for the IODP (Integrated Ocean Drilling Program). NanTroSEIZE is a large, international, multidisciplinary scientific project that required long-term planning and implementation. The project involved almost two decades of planning and may continue for another decade while carrying out drilling, coring, and long-term borehole monitoring. This large scientific project has now officially started, and we expect that the resulting scientific findings will be of international significance.

著者

岡村 行信 倉本 真一 大竹 政和 平 朝彦 太田 陽子 石川 有三 鷺谷 威 加藤 幸弘 下川 浩一 粟田 泰夫

出版者

一般社団法人 日本地質学会

雑誌

日本地質学会学術大会講演要旨 (ISSN:13483935)

巻号頁・発行日

vol.1999, 1999

著者

荒井 晃作 岡村 行信 池原 研 倉本 真一

出版者

一般社団法人 日本地質学会

雑誌

日本地質学会学術大会講演要旨 (ISSN:13483935)

巻号頁・発行日

vol.2003, 2003

著者

倉本 真一 上嶋 正人 岡村 行信

出版者

一般社団法人 日本地質学会

雑誌

日本地質学会学術大会講演要旨 (ISSN:13483935)

巻号頁・発行日

vol.1997, 1997

著者

芦 寿一郎 岡村 行信 倉本 真一 徳山 英一

出版者

一般社団法人 日本地質学会

雑誌

日本地質学会学術大会講演要旨 (ISSN:13483935)

巻号頁・発行日

vol.1999, 1999

著者

倉本 真一 岡村 行信

出版者

一般社団法人 日本地質学会

雑誌

日本地質学会学術大会講演要旨 (ISSN:13483935)

巻号頁・発行日

vol.1999, 1999

著者

徳山 英一 本座 栄一 木村 政昭 倉本 真一 芦 寿一郎 岡村 行信 荒戸 裕之 伊藤 康人 除 垣 日野 亮太 野原 壮 阿部 寛信 坂井 眞一 向山 建二郎

出版者

海洋調査技術学会

雑誌

海洋調査技術 (ISSN:09152997)

巻号頁・発行日

vol.13, no.1, pp.27-53, 2001-03-31

参考文献数

56

被引用文献数

6

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We propose the guideline to identify fault in offshore region mainly based on MCS profiles, combining high resolution bathymetric maps and geological data such as bore hole results. Based on the guideline we distinguished total 776 faults developing around Japan since the latest Miocene and 753 faults out of total numbers of faults are interpreted to have been active by Quaternary. Together with distinguishment of fault we examined the attributes of each faults such as surface and vertical distribution, criteria of offset, age of movement, certainty of a fault and so on. <br>The results of the distinguishment and examination of the fault leads to the conclusion that the ongoing tectonic framework around Japan characterized by 1) oblique Subduction along the Nankai Trough, 2) rifting at the Okinawa Trough, 3) E-W compressionl regeme along the Japan Sea margin, 4) E-W compressionl regeme along southwestern margin of the Okhotsk Sea and off southern Hokkaido, 5) E-W compressionl regeme along the Japan Trench, 6) rifting in the central arc of the Izu-Ogasawara Arc has been established since 3 Ma, at the earliest 6 Ma. <br>We utilized high resolution data set which we enable to access. Tow big problems, however, still remain in terms of reliability of fault recognition. Those are 1) age of fault movement and 2) spatial distribution of fault. To solve the first one, new technique is required in order to obtain core samples which provide critical evidence to determine age of fault movement. As is second problem concerned, new intensive seismic survey is indispensable to make a precise fault distribution map, especially in the boundary area between land and sea.

著者

荒井 晃作 岡村 行信 倉本 真一

出版者

一般社団法人 日本地質学会

雑誌

日本地質学会学術大会講演要旨 (ISSN:13483935)

巻号頁・発行日

vol.1998, 1998

著者

横田 俊之 倉本 真一 松島 潤 徳山 英一 池 俊宏 PASCAL Georges LALLEMANT Siegfried

雑誌

物理探査学会学術講演会講演論文集 = Proceeding of the SEGJ Conference

巻号頁・発行日

vol.103, pp.124-127, 2000-10

参考文献数

3

著者

松島 潤 池 俊宏 横田 俊之 倉本 真一 大久保 秦邦 徳山 英一 六川 修一

雑誌

物理探査学会学術講演会講演論文集 = Proceeding of the SEGJ Conference

巻号頁・発行日

vol.107, pp.236-239, 2002-10-22

参考文献数

5

著者

倉本 真一

出版者

海洋理工学会

雑誌

海洋理工学会誌 (ISSN:13412752)

巻号頁・発行日

vol.24, no.2, pp.39-44, 2018 (Released:2018-12-28)

参考文献数

4

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Importance of scientific ocean drilling was becoming more widely known in the Japanese scientific community, based upon the results of DSDP/IPOD/ODP by late 80s. Many scientific and engineering discussions took place domestically and internationally, and finally those discussions led the Japanese government to decisively move forward with the construction of D/V Chikyu. Finally, Chikyu was delivered to the Japan Agency for Marine-Earth Science and Technology (JAMSTEC) in July 2005. Chikyu was designed and built as a scientific ocean drilling vessel capable of riser drilling in water depths of 2,500 m (future target is 4,000 m class). Chikyu can drill in deeper water and to deeper sub sea floor depths than any other scientific drilling platforms. Chikyu’s large hull makes it possible for a large onboard laboratory, with space for large analytical instruments and facilities. Since the first scientific operation conducted in the Nankai Trough in 2007, Chikyu made significant scientific achievements by IODP Expeditions. Those results are briefly introduced and show a future operation challenge with introducing Chikyu’s general features.

著者

荒井 晃作 岡村 行信 池原 研 倉本 真一

出版者

一般社団法人 日本地質学会

雑誌

日本地質学会学術大会講演要旨

巻号頁・発行日

vol.2003, 2003

著者

倉本 真一

出版者

日本地質学会

雑誌

日本地質学会学術大会講演要旨

巻号頁・発行日

vol.96, 1989-04-25

著者

倉本 真一 平 朝彦 Bangs Nathan L. SHIPLEY Thomas H. MOORE Gregory F. EW99-07 08 航海乗船研究者

出版者

Tokyo Geographical Society

雑誌

地學雜誌 (ISSN:0022135X)

巻号頁・発行日

vol.109, no.4, pp.531-539, 2000-08-25

被引用文献数

10 19

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A three-dimensional seismic survey was carried out at the western Nankai Trough accretionary wedge from June 18 to August 18, 1999. This experiment was Japan-U.S. collaborative investigation on seismogenic zones. The cruise imaged an 8 X 80 km area with 81, 80km-long, high quality, seismic reflection lines, all of which have nearly continuous coverage.<BR>The main objective of our experiment was to image the plate boundary fault at which major earthquakes and tsunamis are generated. Our primary goal is to image the thrust and identify the boundary between aseismic and seismic zones for a large inter-plate earthquake.<BR>On-board two-dimensional data processing has been carried out. This gives us a significantly clear image of the inner structure of the accretionary wedge at our survey area. One impressive image of the profile shows the large thrust slice zone that is classified by our interpretation. A number of out-of-sequence thrusts have developed and are concentrated in the area where the water depth is approximately 4, 000 to 3, 000m. A decollement plane touches the oceanic plate (layer II) down at there in first. We identified that the boundary between the stable sliding zone (ocean-ward) and the unstable stick slip zone (landward) is located there. We propose that the boundary is the up-dip limit of the seismogenic zone. Further data processing is ongoing. A true three-dimensional structure will reveal much more details and a clear image of seismogenic zone at the Nankai subduction margin.