2016年6月
Background seismicity in Boso Peninsula, Japan: Long-term acceleration, and relationship with slow slip events
GEOPHYSICAL RESEARCH LETTERS
- ,
- ,
- ,
- 巻
- 43
- 号
- 11
- 開始ページ
- 5671
- 終了ページ
- 5679
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1002/2016GL068524
- 出版者・発行元
- AMER GEOPHYSICAL UNION
Slow slip events (SSEs) in subduction zones can trigger earthquake swarms, especially at shallow depth. The monitoring of seismicity rates has therefore the potential to help detect and characterize SSEs, and transient changes in coupling. However, the relationship between seismicity rate and slow slip rate during a SSE is unknown and made complicated by aftershock triggering within the swarm. Here we propose to complement geodetic methods with an objective measure of the seismicity rate that is directly associated with changes in slip rate. We show that this measure, applied to known occurrences of SSEs in the Boso area, Japan, yields an estimate, albeit indirect, of their seismic moment, hence their slip rate. We finally prove that the background rate in Boso has been accelerating since 1990; this explains previous observations of the shortening of the recurrence time between SSEs in Boso, that clearly predate the 2011 M(w)9.0 Tohoku-Oki earthquake.
- リンク情報
- ID情報
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- DOI : 10.1002/2016GL068524
- ISSN : 0094-8276
- eISSN : 1944-8007
- ORCIDのPut Code : 25784327
- Web of Science ID : WOS:000379851800016