Characteristics of short‐term slow slip events estimated from deep low‐frequency tremors in Shikoku, Japan
Characteristics of short‐term slow slip events estimated from deep low‐frequency tremors in Shikoku, Japan
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日本四国深部低频地震估计的短期慢滑移事件特征
DOI：
10.1029/2010jb007608
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发表时间：
2010
影响因子：
--
通讯作者：
K. Obara
中科院分区：
文献类型：
--
作者：
T. Hirose;Y. Hiramatsu;K. Obara
[1] 我们利用非火山深部低频 (DLF) 震动研究了日本四国地区下方板块界面上的短期慢滑移事件 (SSE) 的特征、复发间隔和大小分布以及滑移率。根据大地测量观测到的SSE地震矩与相应事件的DLF震颤总大小之间的比例关系，我们从DLF震颤中估计了由于板块界面滑移引起的地震矩和累积地震矩的时间变化。主要短期上证事件的复发间隔西部地区约为6个月，中东部地区为3个月。短期 SSE 和 DLF 地震的规模分布是通过指数定律而不是幂律来近似的，这显示出常规地震的不同尺度。根据SSE累积震矩随时间估算的过渡带平均滑移速率，西部、中部和东部地区分别为4.2 cm/yr、3.3 cm/yr和4.9 cm/yr。这些值补偿了海沟处的收敛速率与俯冲菲律宾海板块过渡区的滑移赤字率之间的差异。换句话说，根据 DLF 震动估计的滑移率提供了板块界面过渡区滑移不足率的约束。
[1] We have investigated the characteristics of short-term slow slip events (SSEs), recurrence interval and size distribution, and the slip rate at the transition zone on the plate interface beneath the Shikoku region, Japan, using nonvolcanic deep low frequency (DLF) tremors. On the basis of a proportional relationship between the seismic moment of SSE observed geodetically and the total size of DLF tremors of the corresponding episode, we estimated the seismic moment due to the slip on the plate interface from the DLF tremors and a temporal variation in the cumulative seismic moment. The recurrence interval of major short-term SSEs is ∼6 months in the western area and 3 months in the central and the eastern areas. The size distribution of short-term SSEs as well as DLF tremors is approximated by an exponential law rather than by a power law, showing a different scaling for regular earthquakes. The average slip rate at the transition zone estimated from the cumulative seismic moment with time of SSEs is 4.2 cm/yr, 3.3 cm/yr, and 4.9 cm/yr in the western, central, and eastern areas, respectively. These values compensate for the difference between the convergence rate at the trench and the slip deficit rate at the transition zone of the subducting Philippine Sea plate. In other words, the slip rate estimated from the DLF tremors provides a constraint of the slip deficit rate at the transition zone on the plate interface.
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作者：
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通讯作者：
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影响因子：
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作者：
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作者：
Shelly, David R.;Beroza, Gregory C.;Ide, Satoshi
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DOI：
--
发表时间：
2019
期刊：
影响因子：
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作者：
Ide;S.
通讯作者：
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DOI：
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发表时间：
2009
期刊：
影响因子：
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作者：
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