Short-term spatiotemporal variations in the aftershock sequence of the 2004 mid-Niigata prefecture earthquake
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概要
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We deployed 56 temporary seismic stations within approximately a month after the occurrence of the 2004 mid-Niigata prefecture earthquake. Using manually-picked arrival data obtained from the temporary and surrounding permanent seismic stations, 1056 aftershocks have been relocated. Based on the spatiotemporal variations in the relocated aftershocks, the cluster activities associated with the mainshock and some large aftershock events are identified. The aftershocks associated with the mainshock, the largest occurred on the two steep west-dipping planes at an angle of 60° and approximately 5 km away. In contrast, the aftershocks following the event on Oct. 27 are aligned on east-dipping plane at a low angle of 25°. It is further observed that the aftershock area extended in both northeastward and southwestward directions at a later stage. The triggered seismicity around the northeast edge was more significant than that around the southwest edge. This difference could be understood by the discrepancy in the shear stress level accumulated at the dynamic shear rupture due to the mainshock.
- 公益社団法人 日本地震学会、地球電磁気・地球惑星圏学会 、特定非営利活動法人 日本火山学会、日本測地学会、日本惑星科学会の論文
著者
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Iwasaki Takaya
Earthquake Research Institute The University Of Tokyo
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Kanazawa Toshihiko
Earthquake Research Institute The University Of Tokyo
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Iidaka Takashi
Earthquake Research Institute The University Of Tokyo
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Igarashi Toshihiro
Earthquake Research Institute University Of Tokyo
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Yamanaka Yoshiko
Earthquake Research Institute University Of Tokyo
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Murotani Satoko
Earthquake Research Institute University Of Tokyo
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Kawamura Tomonori
Earthquake Research Institute University Of Tokyo
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Nagai Satoru
Earthquake Research Institute University Of Tokyo
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Hirata Naoshi
Earthquake Research Institute The University Of Tokyo
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Kurashimo Eiji
Earthquake Research Institute The University Of Tokyo
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Sakai Shinichi
Earthquake Research Institute University Of Tokyo
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Kato Aitaro
Earthquake Research Institute The University Of Tokyo
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