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  1. 防災科研関係論文

Tremor and Inferred Slow Silo Associated With Afterslip of the 2011 Tohoku Earthquake

https://nied-repo.bosai.go.jp/records/2868
https://nied-repo.bosai.go.jp/records/2868
f6b0e01d-2ee2-4825-934e-2b40207b0986
Item type researchmap(1)
公開日 2023-03-30
タイトル
言語 en
タイトル Tremor and Inferred Slow Silo Associated With Afterslip of the 2011 Tohoku Earthquake
言語
言語 eng
著者 Kazuaki Ohta

× Kazuaki Ohta

en Kazuaki Ohta

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Yoshihiro Ito

× Yoshihiro Ito

en Yoshihiro Ito

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Ryota Hino

× Ryota Hino

en Ryota Hino

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Shukei Ohyanagi

× Shukei Ohyanagi

en Shukei Ohyanagi

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Takanori Matsuzawa

× Takanori Matsuzawa

en Takanori Matsuzawa

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Hajime Shiobara

× Hajime Shiobara

en Hajime Shiobara

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Masanao Shinohara

× Masanao Shinohara

en Masanao Shinohara

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抄録
内容記述タイプ Other
内容記述 Characterizing shallow interplate slip is essential for modeling the potential generation of megathrust earthquakes and tsunamis. Large postseismic crustal deformation caused by the 2011 Tohoku-Oki earthquake suggests the occurrence of shallow afterslip, but it is unclear what kind of slip is dominant at the shallow plate interface. Here we report episodic tremor activity south of the primary rupture area based on ocean bottom seismometer observations. Five tremor episodes with recurrence intervals of similar to 60 days show migration behavior and shear mechanisms consistent with plate subduction, indicating the occurrences of the episodic slow slip events in the vicinity of the afterslip area. The association of slow slip events and afterslip sheds new light on the frictional nature and stress state of shallow megathrusts and may help predict the possible rupture extent of future earthquakes.Plain Language Summary Understanding the slip characteristics in the shallow part of subduction zone is essential to evaluate the potential risk of megathrust earthquakes and tsunamis. It remains unclear, however, what type of slip occurs at the shallow plate interface due to the difficulty in observing offshore seismic activity. In this paper, we report newly discovered tremor and slow slip activity in the afterslip region where coseimic rupture did not happen during the 2011 Tohoku-Oki earthquake, based on a new campaign ocean bottom seismometer observation. We propose that the tremor and slow slip region illuminate the boundary between fast coseismic slip and stable aseismic slip that could limit the rupture extent of future megathrust earthquakes. The observed tremor and slow slip activities also suggest that the interplate stress state has been recovered to the level of that before the Tohoku earthquake.
言語 en
書誌情報 en : GEOPHYSICAL RESEARCH LETTERS

巻 46, 号 9, p. 4591-4598, 発行日 2019-05
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 10.1029/2019GL082468
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