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Double-difference Relocation of the Aftershocks of the Tecomán, Colima, Mexico Earthquake of 22 January 2003

Andrews, Vanessa and Stock, Joann and Ramírez Vázquez, Carlos Ariel and Reyes-Dávila, Gabriel (2011) Double-difference Relocation of the Aftershocks of the Tecomán, Colima, Mexico Earthquake of 22 January 2003. Pure and Applied Geophysics, 168 (8-9). pp. 1331-1338. ISSN 0033-4553. doi:10.1007/s00024-010-0203-0.

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On 22 January 2003, the M_w = 7.6 Tecomán earthquake struck offshore of the state of Colima, Mexico, near the diffuse triple junction between the Cocos, Rivera, and North American plates. Three-hundred and fifty aftershocks of the Tecomán earthquake with magnitudes between 2.6 and 5.8, each recorded by at least 7 stations, are relocated using the double difference method. Initial locations are determined using P and S readings from the Red Sismológica Telemétrica del Estado de Colima (RESCO) and a 1-D velocity model. Because only eight RESCO stations were operating immediately following the Tecomán earthquake, uncertainties in the initial locations and depths are fairly large, with average uncertainties of 8.0 km in depth and 1.4 km in the north–south and east–west directions. Events occurring between 24 January and 31 January were located using not only RESCO phase readings but also additional P and S readings from 11 temporary stations. Average uncertainties decrease to 0.8 km in depth, 0.3 km in the east–west direction, and 0.7 km in the north–south direction for events occurring while the temporary stations were deployed. While some preliminary studies of the early aftershocks suggested that they were dominated by shallow events above the plate interface, our results place the majority of aftershocks along the plate interface, for a slab dipping between approximately 20° and 30°. This is consistent with the slab positions inferred from geodetic studies. We do see some upper plate aftershocks that may correspond to forearc fault zones, and faults inland in the upper plate, particularly among events occurring more than 3 months after the mainshock.

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Stock, Joann0000-0003-4816-7865
Additional Information:© 2010 The Author(s). This article is distributed under the terms of the Creative Commons Attribution Noncommercial License which permits any noncommercial use, distribution, and reproduction in any medium, provided the original author(s) and source are credited. Received 12 February 2010; Revised: 6 August 2010; Accepted: 9 August 2010; Published online: 10 November 2010. Research supported by the US National Science Foundation under grant EAR-0510395 and by the California Institute of Technology’s division of Geological and Planetary Sciences under contribution 10051.
Group:Seismological Laboratory, Division of Geological and Planetary Sciences
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Subject Keywords:Aftershocks – Colima – earthquakes – seismicity – relocation
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Caltech Division of Geological and Planetary Sciences10051
Issue or Number:8-9
Record Number:CaltechAUTHORS:20110801-073428119
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Official Citation:Double-difference Relocation of the Aftershocks of the Tecomán, Colima, Mexico Earthquake of 22 January 2003 Vanessa Andrews, Joann Stock, Carlos Ariel Ramírez Vázquez and Gabriel Reyes-Dávila
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:24602
Deposited By: Ruth Sustaita
Deposited On:01 Aug 2011 15:20
Last Modified:09 Nov 2021 16:25

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