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  1. 防災科研関係論文

Rupture process of the 2001 Hyogo-Ken Hokubu, Japan, earthquake (Mw 5.2) and comparison between the aftershock activity and the static stress changes

https://nied-repo.bosai.go.jp/records/5321
https://nied-repo.bosai.go.jp/records/5321
13b63ed6-2707-42cf-ae2a-8db3a40a1164
Item type researchmap(1)
公開日 2023-03-30
タイトル
言語 en
タイトル Rupture process of the 2001 Hyogo-Ken Hokubu, Japan, earthquake (Mw 5.2) and comparison between the aftershock activity and the static stress changes
言語
言語 eng
著者 T Kimura

× T Kimura

en T Kimura

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Y Kakehi

× Y Kakehi

en Y Kakehi

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抄録
内容記述タイプ Other
内容記述 The 2001 Hyogo-ken Hokubu earthquake (M-w 5.2) occurred in the northern part of Hyogo prefecture in southwestern Japan and some clusters of the following aftershock activity extended in a direction different from the mainshock strike direction. First, we investigate the rupture process of this event by inverting near-source strong-ground-motion waveforms. Though it is an M 5 class event, high-quality waveforms were recorded by the high-density, strong ground motion networks. To obtain accurate Green's functions for the source inversion, we calibrate the crustal structure models by forward modeling of the observed waveforms of small events. The rupture process imaged from the inversion of the 0.4-2.0 Hz waveforms is relatively simple. A large slip area is located around the rupture nucleation point. Second, we examine the effect of the static stress changes caused by the mainshock and the large aftershocks on the following seismicity. We calculate the changes of Coulomb failure function (Delta CFF) using the heterogeneous slip distribution on the fault plane of the mainshock estimated from the waveform inversion and taking into account the effects of the following large aftershocks. In this way, we obtain a complex spatiotemporal distribution of Delta CFF in the focal area. Most of the aftershocks separated from the mainshock fault occurred in the positive Delta CFF region. This result suggests that these aftershocks were strongly affected by Delta CFF caused by the mainshock and the preceding large aftershocks.
言語 en
書誌情報 en : BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA

巻 95, 号 1, p. 145-158
出版者
言語 en
出版者 SEISMOLOGICAL SOC AMER
ISSN
収録物識別子タイプ EISSN
収録物識別子 1943-3573
DOI
関連識別子 10.1785/0120040012
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