Low-frequency earthquakes in the Mexican Sweet Spot
Low-frequency earthquakes in the Mexican Sweet Spot
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DOI：
10.1002/grl.50561
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发表时间：
2013-06-16
影响因子：
5.2
通讯作者：
Prieto, German A.
中科院分区：
文献类型：
--
作者：
Frank, William B.;Shapiro, Nikolai M.;Prieto, German A.
我们使用视觉识别模板来执行网络波形相关性搜索，生成了大约 17,000 个经过稳健检测的 LFE，这些 LFE 形成了 15 个不同的系列。叠加LFE系列的相应检测结果可以得到具有高信噪比和清晰的P波和S波到达的地震图；我们利用这些旅行时间来定位源头。由此产生的位置叠加了先前确定的永久性非火山震颤（NVT）活动区域。哈斯克等人。 （2012）将该地区称为“甜蜜点”，表明当地条件足以持续产生 NVT。 LFE 震源位于上板-板界面周围 40-45 公里深度的区域。我们通过将叠加地震图与合成地震图进行比较来描述它们的震源机制。该分析揭示了一种常见的低倾焦点机制。
We use visually-identified templates to perform a network waveform correlation search that produced similar to 17,000 robustly detected LFEs that form 15 distinct families. Stacking an LFE family's corresponding detections results in seismograms with high signal-to-noise ratios and clear P and S wave arrivals; we use these travel times to locate the sources. The resulting locations superpose a previously identified region of permanent non-volcanic tremor (NVT) activity. Husker et al. (2012) called this region a Sweet Spot, suggesting that the local conditions are adequate to continuously generate NVT. The LFE hypocenters have been located at a depth of 40-45km in an area that is surrounding the upper slab-plate interface. We characterize their focal mechanisms by comparing their stacked seismograms to synthetic seismograms. This analysis reveals a common low-dipping focal mechanism.