Nonvolcanic tremor observed in the Mexican subduction zone
Abstract
Nonvolcanic tremor (NVT) activity is revealed as episodes of higher spectral amplitude at 1-8 Hz in daily spectrograms from the continuous seismological records in Guerrero, Mexico. The analyzed data cover a period of 2001-2007 when in 2001-2002 a large slow slip event (SSE) had occurred in the Guerrero-Oaxaca region, and then a new large SSE occurred in 2006. The tremor burst is dominated by S-waves. More than 100 strong NVT bursts were recorded in the narrow band of ~40 × 150 km2 to the south of Iguala City and parallel to the coastline. Depths of NVT hypocenters are mostly scattered in the continental crust between 5 and 40 km depth. Tremor activity is higher during the 2001-2002 and 2006 SSE compared with that for the ``quiet'' period of 2003-2005. While resistivity pattern in Guerrero does not correlate directly with the NVT distribution, gravity and magnetic anomaly modeling favors a hypothesis that the NVT is apparently related to the dehydration and serpentinization processes.
- Publication:
-
Geophysical Research Letters
- Pub Date:
- April 2008
- DOI:
- 10.1029/2007GL032877
- Bibcode:
- 2008GeoRL..35.7305P
- Keywords:
-
- Seismology: Seismicity and tectonics (1207;
- 1217;
- 1240;
- 1242);
- Seismology: Subduction zones (1207;
- 1219;
- 1240);
- Geodesy and Gravity: Transient deformation (6924;
- 7230;
- 7240);
- Geodesy and Gravity: Satellite geodesy: results (6929;
- 7215;
- 7230;
- 7240);
- Geodesy and Gravity: Seismic cycle related deformations (6924;
- 7209;
- 7223;
- 7230)