HR: 1340h
AN: S43A-1052    [Abstracts]
TI: Earthquake Locations in Southeastern Spain Obtained Using the COMPLOC Software
AU: * Ocana Peinado, E
EM: elena@iag.ugr.es
AF: Instituto Andaluz de Geofísica, University of Granada, Campus de Cartuja s/n. 18071, Granda, 18071, Spain
AU: Shearer, P
EM: pshearer@ucsd.edu
AF: Institute of Geophysics and Planetary Physics, U.C. San Diego, La Jolla, CA 92093-0225, United States
AU: Lin, G
EM: glin@geology.wisc.edu
AF: University of Wisconsin-Madison, Dept. of Geology and Geophysics 1215 W. Dayton St., Madison, WI 53706, United States
AU: Sanchez, F V
EM: sanchez@iag.ugr.es
AF: Instituto Andaluz de Geofísica, University of Granada, Campus de Cartuja s/n. 18071, Granda, 18071, Spain
AB: We present preliminary results of relocating over 9500 events in southeastern Spain from 1998 to 2006 using the COMPLOC earthquake location software (Lin and Shearer, 2006). This algorithm uses a robust misfit measure and improves the relative location accuracy among nearby earthquakes by computing source-specific station terms. COMPLOC has been tested mainly in southern California but is available for use in other regions. Because of the relatively sparse station coverage in southern Spain, we modified the programs to use regional Pn and Sn arrivals, in addition to crustal P and S picks. Determining the best reference 1-D velocity model for the region is challenging because nearby stations are lacking for most of the events and there are large tradeoffs between the event locations and the velocity model. Our preferred velocity model locates most of the seismicity between 5 and 15 km depth and yields locations that are reasonably robust with respect to changes in the maximum epicentral distance. Our locations exhibit greater clustering of seismicity than is seen in the standard catalog, which may permit improved identification of faults.
DE: 7230 Seismicity and tectonics (1207, 1217, 1240, 1242)
SC: Seismology [S]
MN: 2007 Fall Meeting