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Nonvolcanic tremor observed in the Mexican subduction zone

Payero, Juan S. and Kostoglodov, Vladimir and Shapiro, Nikolai and Mikumo, Takeshi and Iglesias, Arturo and Pérez-Campos, Xyoli and Clayton, Robert W. (2008) Nonvolcanic tremor observed in the Mexican subduction zone. Geophysical Research Letters, 35 (7). Art. No. L07305. ISSN 0094-8276. http://resolver.caltech.edu/CaltechAUTHORS:20101112-150954054

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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 km^2 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.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1029/2007GL032877 DOIUNSPECIFIED
http://www.agu.org/pubs/crossref/2008/2007GL032877.shtmlPublisherUNSPECIFIED
Additional Information:© 2008 American Geophysical Union. Received 4 December 2007; revised 17 February 2008; accepted 28 February 2008; published 4 April 2008. This study is based on the MASE data and partially supported by PAPIIT IN102105, CONACYT 46064, SEP-CONACYT- ANUIES-ECOS M06-U02, and ANR-06-CEXC-005 (COHERSIS) project grants. We thank Ing. Casiano Jiménez Cruz, SSN (Mexico) for the recent seismic catalog and Kazushige Obara for some suggestions at an initial stage of this study. The authors gratefully acknowledge the assistance of the UNAM students in numerous field works during the MASE project. The MASE experiment of the Caltech Tectonics Observatory was funded by the Gordon and Betty Moore Foundation. Contribution 82 from the Caltech Tectonics Observatory.
Group:Caltech Tectonics Observatory, Caltech Tectonics Observatory. MesoAmerican Subduction Experiment (MASE)
Funders:
Funding AgencyGrant Number
Gordon and Betty Moore FoundationUNSPECIFIED
PAPIITIN102105
Consejo Nacional de Ciencia y Tecnologí (CONACYT)46064
COHERSIS SEP-CONACYT-ANUIES-ECOS M06-U02
COHERSIS ANR-06-CEXC-005
Subject Keywords:dynamic subsidence; geodynamic models; sea level
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Caltech Tectonics Observatory82
Record Number:CaltechAUTHORS:20101112-150954054
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20101112-150954054
Official Citation:Payero, J. S., V. Kostoglodov, N. Shapiro, T. Mikumo, A. Iglesias, X. Pérez-Campos, and R. W. Clayton (2008), Nonvolcanic tremor observed in the Mexican subduction zone, Geophys. Res. Lett., 35, L07305, doi:10.1029/2007GL032877.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:20783
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:17 Nov 2010 21:58
Last Modified:26 Dec 2012 12:38

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