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  1. 防災科研関係論文

Spatial distribution and focal mechanisms of aftershocks of the 2011 off the Pacific coast of Tohoku Earthquake

https://nied-repo.bosai.go.jp/records/5880
https://nied-repo.bosai.go.jp/records/5880
837c5c27-ed82-4a12-a1cb-fd8e2f7ff2e3
Item type researchmap(1)
公開日 2023-03-30
タイトル
言語 en
タイトル Spatial distribution and focal mechanisms of aftershocks of the 2011 off the Pacific coast of Tohoku Earthquake
言語
言語 eng
著者 Youichi Asano

× Youichi Asano

en Youichi Asano

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Tatsuhiko Saito

× Tatsuhiko Saito

en Tatsuhiko Saito

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Yoshihiro Ito

× Yoshihiro Ito

en Yoshihiro Ito

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Katsuhiko Shiomi

× Katsuhiko Shiomi

en Katsuhiko Shiomi

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Hitoshi Hirose

× Hitoshi Hirose

en Hitoshi Hirose

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Takumi Matsumoto

× Takumi Matsumoto

en Takumi Matsumoto

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Shin Aoi

× Shin Aoi

en Shin Aoi

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Sadaki Hori

× Sadaki Hori

en Sadaki Hori

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Shoji Sekiguchi

× Shoji Sekiguchi

en Shoji Sekiguchi

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抄録
内容記述タイプ Other
内容記述 We estimated centroid moment tensors of earthquakes that occurred from 2003 to 2011 in and around the focal area of the 2011 M(w) 9.0 megathrust earthquake in eastern Japan. The result indicates that earthquakes occurring before the mainshock, which included foreshocks off Miyagi, were basically interplate earthquakes with thrust-type focal mechanisms. On the other hand, the aftershocks exhibited a variety of focal mechanisms. Interplate aftershocks with thrust focal mechanisms did not occur within the large coseismic slip area estimated from GPS data but instead occurred in the surrounding regions. This implies that slip could no longer occur in the coseismic slip area due to the large amount of stress release during the mainshock rupture, whereas the aftershocks in the surrounding regions were caused by a stress concentration in these regions due to the large co-seismic slip associated with the mainshock asperity. Normal-fault-type aftershocks were widely distributed in the overriding plate and the outer-rise of the Pacific Plate. These aftershocks may have been due to a tensional stress change caused by the coseismic slip. Thrust-fault-type aftershocks in the subducting Pacific Plate were also interpreted as being due to compressional stress change as a result of the coseismic slip.
言語 en
書誌情報 en : EARTH PLANETS AND SPACE

巻 63, 号 7, p. 669-673, 発行日 2011
出版者
言語 en
出版者 TERRA SCIENTIFIC PUBL CO
ISSN
収録物識別子タイプ ISSN
収録物識別子 1343-8832
DOI
関連識別子 10.5047/eps.2011.06.016
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