Low-frequency earthquakes in the Mexican Sweet Spot
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Prieto_Low-frequency.pdf
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Author(s)
Frank, William B.
Shapiro, Nikolaï M.
Kostoglodov, Vladimir
Husker, Allen L.
Campillo, Michel
Payero, Juan S.
Prieto Gomez, German A.
Date Issued
June 2013
Journal
Geophysical Research Letters
Publisher
American Geophysical Union
Citation
Frank, William B., Nikolaï M. Shapiro, Vladimir Kostoglodov, Allen L. Husker, Michel Campillo, Juan S. Payero, and Germán A. Prieto. “Low-Frequency Earthquakes in the Mexican Sweet Spot.” Geophys. Res. Lett. 40, no. 11 (June 16, 2013): 2661–2666.
Version
Final published version
Abstract
We use data from the Meso-America Subduction Experiment to detect and locate low-frequency earthquakes (LFEs) in the Mexican subduction zone. We use visually-identified templates to perform a network waveform correlation search that produced ~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 40–45 km 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.
MIT Department
Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1002/grl.50561
