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  1. 防災科研関係論文

Seismic velocity structure in the source region of the 2016 Kumamoto earthquake sequence, Japan

https://nied-repo.bosai.go.jp/records/4045
https://nied-repo.bosai.go.jp/records/4045
af0fa2b1-d90b-47f9-88a1-10295c2f2258
Item type researchmap(1)
公開日 2023-03-30
タイトル
言語 en
タイトル Seismic velocity structure in the source region of the 2016 Kumamoto earthquake sequence, Japan
言語
言語 eng
著者 Azusa Shito

× Azusa Shito

en Azusa Shito

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Satoshi Matsumoto

× Satoshi Matsumoto

en Satoshi Matsumoto

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Hiroshi Shimizu

× Hiroshi Shimizu

en Hiroshi Shimizu

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Takahiro Ohkura

× Takahiro Ohkura

en Takahiro Ohkura

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Hiroaki Takahashi

× Hiroaki Takahashi

en Hiroaki Takahashi

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Shinichi Sakai

× Shinichi Sakai

en Shinichi Sakai

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Tomomi Okada

× Tomomi Okada

en Tomomi Okada

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Hiroki Miyamachi

× Hiroki Miyamachi

en Hiroki Miyamachi

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Masahiro Kosuga

× Masahiro Kosuga

en Masahiro Kosuga

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Yuta Maeda

× Yuta Maeda

en Yuta Maeda

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Masayuki Yoshimi

× Masayuki Yoshimi

en Masayuki Yoshimi

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Youichi Asano

× Youichi Asano

en Youichi Asano

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Makoto Okubo

× Makoto Okubo

en Makoto Okubo

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抄録
内容記述タイプ Other
内容記述 We investigate seismic wave velocity structure and spatial distribution of the seismicity in the source region of the 2016 Kumamoto earthquake sequence. A one-dimensional mean velocity shows that the seismogenic zone has a high-velocity and low-Vp/Vs ratio relative to the average velocity structure of Kyushu Island. This indicates that the crust is relatively strong, capable of sustaining sufficiently high strain energy to facilitate two large (M-j > 6.5) earthquakes in close proximity to one another in rapid succession. Three-dimensional tomography of the seismogenic zone around the source of the 2016 Kumamoto earthquake sequence yields Vp = 6 km/s and Vs = 3.5 km/s. Most large-displacement areas (asperities) of the M-j 7.3 event overlap with the seismogenic zone and the overlying surface layer. Aftershock seismicity is distributed deeper than the conventional seismogenic zone, which suggests decreased strength due to fluids or increased stress, both caused by coseismic slip.
言語 en
書誌情報 en : GEOPHYSICAL RESEARCH LETTERS

巻 44, 号 15, p. 7766-7772
出版者
言語 en
出版者 AMER GEOPHYSICAL UNION
ISSN
収録物識別子タイプ EISSN
収録物識別子 1944-8007
DOI
関連識別子 10.1002/2017GL074593
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