Determination of focal mechanisms of nonvolcanic tremor using S wave polarization data corrected for the effects of anisotropy

Determination of focal mechanisms of nonvolcanic tremor using S wave polarization data corrected for the effects of anisotropy
复制标题

使用校正各向异性影响的 S 波偏振数据确定非火山震颤的震源机制

DOI:
10.1002/2015gl067249
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发表时间:
2016
影响因子:
5.2
通讯作者:
N. Takeda
N. Takeda
中科院分区:
地球科学1区
文献类型:
--
作者:
K. Imanishi;T. Uchide;N. Takeda

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我们提出了一种方法来确定非火山震颤的震源机制,使用直接从嘈杂的震颤信号测量的各向异性校正的S偏振。在噪声信号的偏振角的成功检索归功于观察,在一般情况下,震颤传播缓慢,因此不会立即改变它们的位置。震颤的这一特征使我们能够使用更长的时间窗口来计算偏振角(例如,1分钟或更长时间),导致粒子运动的叠加。我们将该方法应用于2013年4月发生在纪伊半岛下方的地震事件。虽然大多数推断的震源机制表明,地震表现为板块界面上的剪切滑动,但也发现了一些具有走滑分量的事件。所提出的方法为我们提供了一种工具,用于研究整个震颤区的震源机制的较小尺度空间分布和时间变化。
We propose a method to determine the focal mechanisms of nonvolcanic tremors using anisotropy‐corrected S polarizations measured directly from noisy tremor signals. The successful retrieval of polarization angles in noisy signals owes much to the observation that, in general, tremors propagate slowly and therefore do not change their location immediately. This feature of tremors enables us to use longer time windows to compute polarization angles (e.g., 1 min or longer), resulting in a stack of particle motions. We applied the method to a tremor episode that occurred beneath the Kii Peninsula in April 2013. Although the majority of inferred focal mechanisms suggested that tremors manifest shear slip on the plate interface, some events with strike‐slip components were also found to have occurred. The proposed method provides us with a tool for investigating smaller‐scale spatial distributions and temporal variations of focal mechanisms throughout tremor zones.
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