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Low-frequency earthquakes in the Mexican sweet spot
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Autores
Frank, William B.
Shapiro, Nikolaï M.
Kostoglodov, Vladimir
Husker, Allen L.
Campillo, Michel
Payero, Juan S.
Prieto, Germán A.
Fecha
2013-05-16
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John Wiley and Sons
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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.
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Keywords
Low?frequency , Earthquakes , Tremor , Slow?slip , Mexico , Subduction
