Recurrent slow slip event reveals the interaction with seismic slow earthquakes and disruption from large earthquake
Recurrent slow slip event reveals the interaction with seismic slow earthquakes and disruption from large earthquake
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反复发生的慢滑事件揭示了慢地震与大地震破坏的相互作用
DOI：
10.1093/gji/ggv238
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发表时间：
2015
影响因子：
2.8
通讯作者：
S. Owen
中科院分区：
文献类型：
--
作者：
Zhen Liu;A. Moore;S. Owen
在许多俯冲带，慢滑事件如何与其他慢震事件和远距离大地震相互作用仍然是个谜。本文利用GEONET GPS定位时间序列和基于卡尔曼滤波的时变滑动反演方法，模拟了2009-2011年日本西南部邦果海峡地区最近长期SSE的时空滑动演变。本文研究了南开海槽附近的慢滑瞬变地震和地震观测到的低频地震与甚低频地震的时空关系。我们发现瞬态滑移与LFEs和V-LFEs之间存在强烈而明显的时间相关性，表明它们与SSE之间存在不同的关系。我们还发现东北大地震似乎破坏了SSE的正常震源过程，这可能反映了地震引起的大规模应力重分布。2009-2011年上证指数与同一地区其他指数相比，在滑移和力矩释放上有很大的相似性，证实了其周期性。瞬变滑移与板块耦合的对比表明，瞬变滑移主要集中在强耦合区到下倾lfe的过渡区，瞬变滑移缓解了过渡深度的弹性应变积累。长期SSE与地震慢震之间不太一致的空间相关性，以及这些慢震对包括长期慢震在内的各种触发源的敏感性，表明在使用地震确定的慢震作为慢震的代理时要谨慎。
It remains enigmatic how slow slip events (SSEs) interact with other slow seismic events and large distant earthquakes at many subduction zones. Here we model the spatiotemporal slip evolution of the most recent long-term SSE in 2009–2011 in the Bungo Channel region, southwest Japan using GEONET GPS position time-series and a Kalman filter-based, time-dependent slip inversion method. We examine the space-time relationship between the geodetically determined slow slip transient and seismically observed low frequency earthquakes (LFEs) and very-low frequency earthquakes (V-LFEs) near the Nankai trough. We find a strong but distinct temporal correlation between transient slip and LFEs and V-LFEs, suggesting a different relationship to the SSE. We also find the great Tohoku-Oki earthquake appears to disrupt the normal source process of the SSE, probably reflecting large-scale stress redistribution caused by the earthquake. Comparison of the 2009–2011 SSE with others in the same region shows much similarity in slip and moment release, confirming its recurrent nature. Comparison of transient slip with plate coupling shows that slip transients mainly concentrate on the transition zone from strong coupling region to downdip LFEs with transient slip relieving elastic strain accumulation at transitional depth. The less consistent spatial correlation between the long-term SSE and seismic slow earthquakes, and susceptibility of these slow earthquakes to various triggering sources including long-term slow slip, suggests caution in using the seismically determined slow earthquakes as a proxy for slow slip.
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影响因子：
5.2
作者：
Ide, Satoshi;Shelly, David R.;Beroza, Gregory C.
通讯作者：
Beroza, Gregory C.
影响因子：
56.9
作者：
Kodaira, S;Iidaka, T;Kaneda, Y
通讯作者：
Kaneda, Y
影响因子：
64.8
作者：
Shelly, David R.;Beroza, Gregory C.;Nakamula, Sho
通讯作者：
Nakamula, Sho
影响因子：
64.8
作者：
Shelly, David R.;Beroza, Gregory C.;Ide, Satoshi
通讯作者：
Ide, Satoshi