期刊
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
卷 119, 期 10, 页码 7686-7700出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/2014JB011457
关键词
low-frequency earthquakes; slow earthquakes; systematic data processing
资金
- Agence Nationale de la Recherche (France) [RA0000CO69]
- European Research Council [227507]
- Russian Science Foundation [14-47-00002]
- Russian Science Foundation [14-47-00002] Funding Source: Russian Science Foundation
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
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