The January 2019 (Mw 6.7) Coquimbo Earthquake: Insights from a Seismic Sequence within the Nazca Plate
The January 2019 (Mw 6.7) Coquimbo Earthquake: Insights from a Seismic Sequence within the Nazca Plate
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2019 年 1 月（震级 6.7）科金博地震：纳斯卡板块内地震序列的见解
DOI：
10.1785/0220190079
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发表时间：
2019
影响因子：
3.3
通讯作者：
R. Madariaga
中科院分区：
文献类型：
--
作者：
S. Ruiz;J. Ammirati;F. Leyton;L. Cabrera;B. Potin;R. Madariaga
2019年1月20日，智利城市科金博和拉塞雷纳在70公里深处发生了6.7级板内地震。高峰地面加速度值和宏观地震强度的报告。主震之后发生了超过150次高于ML 2.5的余震，这是一个由当地台站完全记录的地震序列。使用三维速度模型，我们精确地定位了地震活动。余震位于约20公里以上，并从主震转移，但仍在纳斯卡板块内。我们还对9个事件进行了矩张量反演，使用椭圆片方法获得了大部分正断层震源机制和运动学反演。我们发现主震破坏了一个大约6公里× 8公里的区域，向西北方向向上传播，远离余震区。从包含高达1 Hz的加速度记录反演的破裂具有7.51 MPa的高应力降和仅3 s持续时间的短震源时间函数的特征。
On 20 January 2019, the Chilean cities of Coquimbo and La Serena were shaken by an intraplate earthquake of Mw 6.7 located at 70 km depth. High peak ground acceleration values and macroseismic intensities were reported. The mainshock was followed by more than 150 aftershocks higher than ML 2.5, a seismic sequence completely recorded by local stations. Using a 3D velocity model, we precisely located the seismicity. The aftershocks were located some 20 km above and shifted from the mainshock but still inside the Nazca plate. We also performed moment tensor inversion of nine events obtaining mostly normal‐fault focal mechanisms and kinematic inversions using the elliptical‐patch approach. We found that the mainshock broke an approximated zone of 6 km by 8 km, propagated upward in the northwest direction and away from the aftershock area. The rupture inverted from accelerograms containing up to 1 Hz was characterized with a high stress drop of 7.51 MPa and a short seismic source time function of only 3 s duration.
超过 100,000 个双差重定位震源的智利北部弧前地震活动结构
DOI：
10.1002/2017jb015384
发表时间：
2018
期刊：
Journal of Geophysical Research: Solid Earth
影响因子：
--
作者：
C. Sippl;B. Schurr;G. Asch;J. Kummerow
通讯作者：
J. Kummerow