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ID 27776
本文ファイル
著者
Nakata, Ryoko
Tsuruoka, Hiroshi
NDC
地球科学・地学・地質学
抄録(英)
Slow slip events1 are accompanied by swarms of non-volcanic tremor2, 3 along the subduction zone of the Philippine Sea plate in southwest Japan: the swarms often occur with a periodicity of about 12 or 24 h (refs 4, 5). These episodic events are considered to be a manifestation of stress relaxation at the subducting plate interface1, 6, 7. Here, we analyse seismic data to record the locations and durations of non-volcanic tremor swarms that occurred in May 2005 and February 2006. We evaluate the magnitude of stress changes produced by slow slip events as well as the effective normal stress on the plate interface where slow slip events occur. We find that the observed periodicity in tremor occurrence originates from a combined effect of the periodic stress due to Earth tides and the transient stress due to slow slip events. Our calculations show that non-volcanic tremor is sensitive to stress change. This phenomenon can therefore be effective in monitoring the process of stress relaxation at subducting plate interfaces.
掲載誌名
Nature Geoscience
1巻
1号
開始ページ
676
終了ページ
678
出版年月日
2008
出版者
Nature Pub Group
ISSN
1752-0894
NCID
出版者DOI
言語
英語
NII資源タイプ
学術雑誌論文
広大資料タイプ
学術雑誌論文
DCMIタイプ
text
フォーマット
application/pdf
著者版フラグ
author
関連情報URL
部局名
理学研究科