HR: 1340h
AN: S33A-0308    [Abstracts]
TI: The Crsut Structure of Northwest Mexico Through Multipath Surface Waves Analysis
AU: * Hincapie, J
EM: jimmyh63@yahoo.com
AF: University of Texas at El Paso, UTEP-Geology room 101, El Paso, TX 79968 United States
AU: Doser, D I
EM: doser@geo.utep.edu
AF: University of Texas at El Paso, UTEP-Geology room 101, El Paso, TX 79968 United States
AU: Ortega, R
EM: ortega@cicese.mex
AF: CICESE, Km. 107 Carretera Tijuana - Ensenada, Ensenada, BC 2732 Mexico
AB: The location of the crystalline basement and other crustal features in Northwestern Mexico (Sonora, and Chihuahua) is not well defined. This information is required to better understand its tectonic setting. Several researchers have carried out preliminary studies with results that show a great uncertainty about the velocity structure of the region as well. The only conclusion those studies agree upon is that the region has remarkable similarities with the southwestern U.S. Our study uses information from earthquakes originating in the Gulf of California, and recorded at broadband stations in the U.S. (Arizona, New Mexico, Texas) to determine the velocity structure of the region. Because earthquake sources occur along a 1200km long zone within the gulf, we are able to sample a variety of travel paths within Northwest Mexico. We will analyze Pnl waveforms, coda dacay, and surface waves to build a regional velocity attenuation model. The results are compared to regional gravity and magnetic maps.
DE: 1219 Gravity anomalies and Earth structure (0920, 7205, 7240)
DE: 7205 Continental crust (1219)
SC: Seismology [S]
MN: Fall Meeting 2005