BOLETÍN DE LA SOCIEDAD GEOLÓGICA MEXICANA VOL. 59, NÚM: 1, 2007, p. 71-81 http://dx.doi.org/10.18268/BSGM2007v59n1a6

Reporte preliminar del sismo del 13 de abril de 2007, Guerrero, México

Sara Ivonne Franco*, Caridad Cárdenas-Monroy, Aída Quezada-Reyes, Carlos Valdés-González, Casiano Jiménez-Cruz, Luis Edgar Rodríguez-Abreu, Javier Ortiz-Castro

Contribuciones hechas por: (en orden alfabético)

Arturo Cárdenas-Ramírez, José Luis Cruz-Cervantes, Jorge Alberto Estrada-Castillo, Ángeles Gutiérrez-García, Iván Rodríguez-Rasilla, Bernardino Rubí-Zavala, Yi Tan Li, Alfredo Yañez-Soto

Servicio Sismológico Nacional, Instituto de Geofísica, Universidad Nacional Autónoma de México, México, D.F., 04510.

* This email address is being protected from spambots. You need JavaScript enabled to view it.

Abstract

On april 13, 2007 at 05:42 (Universal Time) an earthquake, with magnitude Mw=5.8, occurred in the state of Guerrero, Mexico, near the Pacific Coast. The event was recorded in 27 stations that comprise the Broadband Seismic Network, managed by the National Seismological Service of Mexico. The source parameters show an interplate thrust earthquake with an almost vertical fault plane. The epicentral location lies within the Guerrero seismic gap. Nevertheless, the hypocentral depth of 30 km makes it difficult to associate this earthquake to a possible stress relaxation in this gap. The largest peak ground acceleration was recorded at CAIG, a broad-band station located less than 20 km from the epicenter. The attenuation curve suggests a very energetic earthquake in comparison with other Mexican interplate events.

Keywords: Guerrero gap, attenuation, focal mechanism, interplate earthquake.