Constraining the source location of the 30 May 2015 (Mw 7.9) Bonin deep-focus earthquake using seismogram envelopes of high-frequency P waveforms: occurrence of deep-focus earthquake at the bottom of a subducting slab
Constraining the source location of the 30 May 2015 (Mw 7.9) Bonin deep-focus earthquake using seismogram envelopes of high-frequency P waveforms: occurrence of deep-focus earthquake at the bottom of a subducting slab
复制标题
利用高频 P 波形地震图包络约束 2015 年 5 月 30 日（兆瓦 7.9）博宁深源地震的震源位置：深源地震发生在俯冲板片底部
DOI：
10.1002/2016gl068437
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
and K. Obara
中科院分区：
文献类型：
--
作者：
S. Takemura;T. Maeda;T. Furumura;and K. Obara
在这项研究中，2015年5月30日（Mw7.9）深源小笠原地震的震源位置使用日本各地记录的P波地震图进行了限制。重点研究了高频P波的传播特性。深源实验室内地震通常显示纺锤形的地震图包络，峰值延迟数秒，随后是长持续时间的尾波;然而，2015年小笠原事件的主震和余震都显示出具有高视速度（~12.2 km/s）的脉冲状P波传播。通过有限差分法模拟板底震源情况下的地震波传播，再现了这种P波传播特征。从2015年小笠原地震观测到的脉冲状P波地震图包络显示，其震源位于太平洋板块底部约680 km的深度，而不是在其中部或上部区域。
In this study, the source location of the 30 May 2015 (Mw7.9) deep‐focus Bonin earthquake was constrained usingPwave seismograms recorded across Japan. We focus on propagation characteristics of high‐frequencyPwave. Deep‐focus intraslab earthquakes typically show spindle‐shaped seismogram envelopes with peak delays of several seconds and subsequent long‐duration coda waves; however, both the main shock and aftershock of the 2015 Bonin event exhibited pulse‐likePwave propagations with high apparent velocities (~12.2 km/s). SuchPwave propagation features were reproduced by finite‐difference method simulations of seismic wave propagation in the case of slab‐bottom source. The pulse‐likePwave seismogram envelopes observed from the 2015 Bonin earthquake show that its source was located at the bottom of the Pacific slab at a depth of ~680 km, rather than within its middle or upper regions.