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  1. 防災科研関係論文

Detection of "rapid" aseismic slip at the Izu-Bonin Trench

https://nied-repo.bosai.go.jp/records/2884
https://nied-repo.bosai.go.jp/records/2884
71c11229-a356-4442-b451-f1623f278ae4
Item type researchmap(1)
公開日 2023-03-30
タイトル
言語 ja
タイトル Detection of "rapid" aseismic slip at the Izu-Bonin Trench
タイトル
言語 en
タイトル Detection of "rapid" aseismic slip at the Izu-Bonin Trench
言語
言語 eng
著者 Yoshio Fukao

× Yoshio Fukao

ja Yoshio Fukao

en Yoshio Fukao

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Tatsuya Kubota

× Tatsuya Kubota

ja Tatsuya Kubota

en Tatsuya Kubota

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Hiroko Sugioka

× Hiroko Sugioka

ja Hiroko Sugioka

en Hiroko Sugioka

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Aki Ito

× Aki Ito

ja Aki Ito

en Aki Ito

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Takashi Tonegawa

× Takashi Tonegawa

ja Takashi Tonegawa

en Takashi Tonegawa

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Hajime Shiobara

× Hajime Shiobara

ja Hajime Shiobara

en Hajime Shiobara

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Mikiya Yamashita

× Mikiya Yamashita

ja Mikiya Yamashita

en Mikiya Yamashita

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Tatsuhiko Saito

× Tatsuhiko Saito

ja Tatsuhiko Saito

en Tatsuhiko Saito

Search repository
抄録
内容記述タイプ Other
内容記述 No great earthquakes have been historically documented at the Izu-Bonin Trench, where subduction is believed to occur largely by aseismic slip, although the details are poorly understood. We deployed an array of ocean bottom pressure gauges here for a year from May 2015. The array recorded the coseismic seafloor uplift/subsidence and tsunamis generated by the nearby Mw6.0 thrust earthquake. In association with this event, we detected two much larger aseismic slip events with rise times around 1 h. The total moment of these two aseismic events was 17 times larger than that of the mainshock. Such aseismic, yet still rapid, slip can be interpreted as one amid the transitional regime. This regime is expected to host slow slip events near its boundary with the stable sliding regime and, possibly, tsunami earthquakes and very low frequency earthquakes near the boundary with the unstable seismic slip regime. Slip in the transitional regime may be a prevalent mode of subduction in the Izu-Bonin trench, where effective normal force on the frictional plate interface is tectonically reduced.
言語 ja
抄録
内容記述タイプ Other
内容記述 No great earthquakes have been historically documented at the Izu-Bonin Trench, where subduction is believed to occur largely by aseismic slip, although the details are poorly understood. We deployed an array of ocean bottom pressure gauges here for a year from May 2015. The array recorded the coseismic seafloor uplift/subsidence and tsunamis generated by the nearby Mw6.0 thrust earthquake. In association with this event, we detected two much larger aseismic slip events with rise times around 1 h. The total moment of these two aseismic events was 17 times larger than that of the mainshock. Such aseismic, yet still rapid, slip can be interpreted as one amid the transitional regime. This regime is expected to host slow slip events near its boundary with the stable sliding regime and, possibly, tsunami earthquakes and very low frequency earthquakes near the boundary with the unstable seismic slip regime. Slip in the transitional regime may be a prevalent mode of subduction in the Izu-Bonin trench, where effective normal force on the frictional plate interface is tectonically reduced.
言語 en
書誌情報 ja : Journal of Geophysical Research: Solid Earth
en : Journal of Geophysical Research: Solid Earth

巻 126, 号 9, p. e2021JB022132, 発行日 2021-08-17
出版者
言語 ja
出版者 American Geophysical Union
出版者
言語 en
出版者 American Geophysical Union
ISSN
収録物識別子タイプ EISSN
収録物識別子 2169-9356
DOI
関連識別子 10.1029/2021JB022132
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