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タイトル: Frictional property of plate interface east off NE Japan inferred from spatial variation in b-value
その他のタイトル: b値から推定した東北日本太平洋下プレート境界面の摩擦特性 : 特集「地震発生の物理からみた地震発生帯堀削」
著者: Yabe, Yasuo
著者(別言語): 矢部, 康男
キーワード: AE activity
frictional property
plate interface
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. 107-111
抄録: Simultaneous evolutions of AE activityon a pre-cut fault and frictional properties of the fault with sliding were observed in a laboratory. The evolutions are probably due to brittle evolution of fault surfaces. It is reported in literature that the b-value of shallow earthquakes east off NE Japan varies with distance from the trench-axis. Because the distance from the trench-axis is regarded as a displacement of the subducting slab, the b-value variation is considered to be a similar phenomenon to the evolution of AE activityin the laboratory. The spatial variation of the b-value is examined to estimate the upper limits of the unstable region on the plate interface. The depths of estimated upper limits are 20km on average, and varylaterallyto depict unstable regions estimated from other seismological and geodetic evidence. The present studysuggests that detailed analyses of high-qualityseismic data provide useful information about the mechanical properties of the plate interface.
URI: http://hdl.handle.net/2261/5737
ISSN: 00408972


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