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タイトル: Structure and Physical Properties of Fracture Zone Derived From Seismic Observations at the Nojima Fault and the Western Tottori Earthquake Fault, Japan
その他のタイトル: 野島断層・鳥取県西部における地震観測による破砕帯の構造と物理的特性 : 特集「地震発生の物理からみた地震発生帯堀削」
著者: Tadokoro, Keiichi
著者(別言語): 田所, 敬一
キーワード: fracture zone
physical property
fault behavior
shear-wave splitting
induced earthquak
発行日: 2003年
出版者: 東京大学地震研究所
掲載誌情報: 地震研究所彙報. 第78号第1冊, 2003, pp. 67-74
抄録: Research on active faults, their structure, physical properties, and fault behavior during an earthquake cycle is important for the earthquake prediction. In this paper, we summarize the results of our seismological analyses of shear-wave splitting and injection-induced earthquakes on the basis of seismic observations at active faults. The shear-wave splitting observations performed on the fracture zone of the 2000 Western Tottori, Japan, earthquake revealed the fracture distribution inside the fracture zone, causing about 1% anisotropy. We can detect the detailed fracture distribution inside a fracture zone through shear-wave splitting observations with a dense (less than several kilometers in interval) seismic array set on and along the fracture zone. The analysis of earthquakes induced by water injection experiments at the Nojima fault, Japan, depicted that the fracture zone is permeable and has a low coefficient of friction immediately after the mainshock. Long-term monitoring of clustered microearthquake activity at the Nojima fault revealed the heterogeneity of crustal strength. We point out that we need to clearly define “fracture zone” for each research background in discussions of fracture zones because the thickness of the fracture zone varies depending on the research method.
URI: http://hdl.handle.net/2261/5733
ISSN: 00408972


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