Using systematically characterized low-frequency earthquakes as a fault probe in Guerrero, Mexico
Using systematically characterized low-frequency earthquakes as a fault probe in Guerrero, Mexico
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DOI：
10.1002/2014jb011457
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发表时间：
2014-10-01
影响因子：
3.9
通讯作者：
Campillo, Michel
中科院分区：
文献类型：
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作者：
Frank, William B.;Shapiro, Nikolai M.;Campillo, Michel
低频地震（LFEs）的研究主要集中在检测先前确定的构造震颤中的事件。然而，匹配过滤器搜索的主要LFE检测工具本质上不能检测先前尚未被表征为模板事件的事件。因此，在这项研究中，我们专注于产生尽可能多的LFE模板，通过统一应用最近开发的LFE模板检测方法，在墨西哥的格雷罗的2.5年的数据集。在匹配过滤器搜索中使用每个检测到的模板，然后我们形成每个代表单个源的事件族。最后，我们开发了简单的，经验的统计选择的事件家庭，代表LFE。我们得到的目录包含1120个独特的LFE源和1，849，486检测LFE超过2.5年的数据集。LFE源的位置，然后被划分为子目录的基础上，他们的距离俯冲海沟。考虑到每个LFE作为一个小单元的滑动沿着俯冲界面，我们观察到离散的LFE活动的区域与大的慢滑事件;这与在先前确定的LFE/震颤最佳点内向下倾斜35公里处观察到的近乎连续的活动形成了直接对比。一次强慢滑事件中低频地震活动的演化
Studies of low-frequency earthquakes (LFEs) have focused on detecting events within previously identified tectonic tremor. However, the principal LFE detection tools of matched-filter searches are intrinsically incapable of detecting events that have not already been characterized previously as a template event. In this study, we therefore focus on generating the largest number possible of LFE templates by uniformly applying a recently developed LFE template detection method to a 2.5 yearlong data set in Guerrero, Mexico. Using each of the detected templates in a matched-filter search, we then form event families that each represents a single source. We finally develop simple, empirical statistics to select the event families that represent LFEs. Our resulting catalog contains 1120 unique LFE sources and a total of 1,849,486 detected LFEs over the 2.5 yearlong data set. The locations of the LFE sources are then divided into subcatalogs based on their distance from the subduction trench. Considering each LFE as a small unit of slip along the subduction interface, we observe discrete episodes of LFE activity in the region associated with large slow-slip events; this is in direct contrast to the near-continuous activity observed 35 km farther downdip within the previously identified LFE/tremor sweet spot.Key PointsUnprecedented systematic analysis of low-frequency earthquakesPrecise details of two different low-frequency earthquake activity regimesEvolution of low-frequency earthquake activity during a strong slow-slip event