Earthquake Research Institute, University of Tokyo
Japan Marine Science and Technology Center
Schlumberger K.K.
Telnite, Co. Ltd.
Geophysical Surveying Co. Ltd.
OYO Corporation
Graduate School of Environmental Studies, Nagoya University
Grduate School of Science, Hokkaido University
Japan Petroleum Exploration Co., Ltd.
Graduate School of Agricultural and Life Sciences, University of Tokyo
Graduate School of Science, Tohoku University
School of Science and Engineering, Waseda University
National Institute of Advanced Industrial Science and Technology
抄録
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 3km 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 0km 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 deepborehole 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.
雑誌名
東京大學地震研究所彙報 = Bulletin of the Earthquake Research Institute, University of Tokyo
巻
78
号
2
ページ
205 - 218
発行年
2003
ISSN
00408972
書誌レコードID
AN00162258
フォーマット
application/pdf
日本十進分類法
051.1
出版者
東京大学地震研究所
出版者別名
Earthquake Research Institute, University of Tokyo
Long-Term Monitoring Using Deep Seafloor Boreholes Penetrating the Seismogenic Zone
IHO78208.pdf
(6.49MB)
