Long-term monitoring using deep seafloor boreholes penetrating the seismogenic zone

Author(s): Shinohara, Masanao; Araki, Eiichiro; Kamata, Masahiro; Kinoshita, Masataka; Kyo, Nori; Kuroki, Kazushi; Kosuge, Yoshinori; Kobayashi, Shomei; Konno, Sunao; Goto, Tadanori; Saito, Saneatsu; Suzuki, Masayoshi; Takahashi, Toru; Tadokoro, Keiichi; Tsunogai, Urumu; Tezuka, Kazuhiro; Nanba, Kenji; Nishi, Masatoshi; Hino, Ryota; Mikada, Hitoshi; Morita, Nobuo; Yoshida, Chikao; Ito, Hisao
Author Affiliation(s): Primary:
University of Tokyo, Earthquake Research Institute, Tokyo, Japan
Other:
Japan Marine Science and Technology Center, Japan
Schlumberger K. K., Japan
Telnite Company, Japan
Geophysical Surveying Company, Japan
OYO Corporation, Japan
Nagoya University, Japan
Hokkaido University, Japan
Japan Petroleum Exploration Company, Japan
Tohoku University, Japan
Waseda University, Japan
National Institute of Advanced Industrial Science and Technology, Japan
Volume Title: Seismogenic zone drilling for earthquake generation process; Part 2
Source: Seismogenic zone drilling for earthquake generation process; Part 2. Bulletin of the Earthquake Research Institute = Tokyo Daigaku Jishin Kenkyusho Iho, 78(2), p.205-218. Publisher: University of Tokyo, Earthquake Research Institute, Tokyo, Japan. ISSN: 0040-8972 CODEN: TDJKAZ
Note: In English. 23 refs.; illus., incl. sketch maps
Summary: Large earthquakes occur frequently in subduction zones. Most earthquakes are generated in the seismogenic zone, a fairly limited area confined to the shallower regions of the subduction plate boundary. To understand the processes of earthquake generation, it is essential to monitor the physical and mechanical properties of the seismogenic zone over long periods. At present, there are no deep borehole observations of the seismogenic zone more than 3 km below seafloor, because it has, until now, been impossible to penetrate to such depths below the sea floor. The Integrated Ocean Drilling Program (IODP), scheduled to begin in 2003, plans to drill boreholes beneath the ocean floor using a multiple-drilling platform operation. The IODP riser-quipped drilling ship (Chikyu) enables the emplacement of boreholes up to 6 km beneath the ocean floor, and will provide opportunities to conduct long-term deep borehole observations in the seismogenic zone. Long-term borehole observations in the seismogenic zone are expected to require the development of advanced sampling, monitoring, and recording technology. Here, we discuss the scientific objectives, engineering and technical challenges, and experimental design for a deep borehole, long-term deep borehole monitoring system aimed at understanding the processes of earthquake generation in the seismogenic zone of subduction plate boundaries. We focus specifically on the relationships between environmental conditions in the deep subsurface, details of monitoring and recording, and design and implementation of scientific tools and programs.
Year of Publication: 2003
Research Program: IODP Integrated Ocean Drilling Program
Key Words: 19 Geophysics, Seismology; Accreting plate boundary; Earthquakes; Faults; Focus; Integrated Ocean Drilling Program; Japan Trench; Monitoring; North Pacific; Northwest Pacific; Ocean bottom seismographs; Ocean floors; Pacific Ocean; Philippine Sea Plate; Plate tectonics; Seismic zoning; Seismographs; Seismotectonics; Splay Fault; Tectonics; West Pacific
Record ID: 2005008340
Copyright Information: GeoRef, Copyright 2018 American Geosciences Institute.

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