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https://hdl.handle.net/20.500.14094/90007810
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2024-05-20
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90007810 (fulltext)
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6.30 MB
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メタデータID
90007810
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open access
出版タイプ
Version of Record
タイトル
Slip Distributions of Short-Term Slow Slip Events in Shikoku, Southwest Japan, From 2001 to 2019 Based on Tilt Change Measurements
著者
著者ID
A0001
研究者ID
1000000465965
KUID
https://kuid-rm-web.ofc.kobe-u.ac.jp/search/detail?systemId=ae245f3e8cf28cd4520e17560c007669
著者名
Hirose, Hitoshi
廣瀬, 仁
ヒロセ, ヒトシ
所属機関名
都市安全研究センター
著者名
Kimura, Takeshi
収録物名
Journal of Geophysical Research. Solid Earth
巻(号)
125(6)
ページ
e2020JB019601-e2020JB019601
出版者
American Geophysical Union (AGU)
刊行日
2020-06
公開日
2021-02-01
抄録
In the southwest Japan subduction zone, short-term slow slip events (SSEs) accompanying nonvolcanic tremor (ETS: episodic tremor and slip) occur repeatedly with recurrence intervals of several months. It is important to know the detailed slip areas of the SSEs because short-term SSEs occur at the downdip extension of a megathrust earthquake rupture zone, and hence, the SSEs play a key role in the stress buildup processes of the megathrust earthquakes. Although most of the previous studies model a SSE fault motion with uniform slip on a rectangular fault, this may lead to a bias in estimating the slip area. In this study we estimate a spatial slip distribution for each of the short-term SSEs from tilt offset measurements. In total, the slip distributions of 61 SSEs in Shikoku from January 2001 to March 2019 are obtained. The ETS zone in Shikoku is divided into three segments in terms of slip history of the SSEs. Before 2011, the slip areas of most of the SSEs are limited in any one of the three segments. After 2012, however, the number of SSEs having a slip area that extends to multiple segments increases. The slip histories at each position in the ETS zone suggest that the short-term SSE activity is affected by the occurrence of nearby long-term SSEs. The average slip rate over 18 years suggests that an estimated slip deficit in the ETS zone in western Shikoku could be released by long-term SSEs, or coseismic slip or afterslip of the megathrust earthquakes.
キーワード
subduction zone
geodetic inversion
tiltmeter
earthquake cycle
strain budget
aseismic slip
カテゴリ
都市安全研究センター
学術雑誌論文
権利
© 2020. American Geophysical Union.
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資源タイプ
journal article
言語
English (英語)
ISSN
2169-9313
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eISSN
2169-9356
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関連情報
DOI
https://doi.org/10.1029/2020JB019601
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