HR: 0800h
AN: S51B-0999    [Abstracts]
TI: Regional moment tensor inversion of Iranian earthquakes with Iranian broadband data
AU: * Alinaghi, A
EM: ali@geol.ku.dk
AF: Geological Institute, University of Copenhagen, Oster Voldgade 10, Copenhagen, 1350 Denmark
AU: Mostafazadeh, M
EM: merhdrad@iiees.ac.ir
AF: IIEES, o. 26, Arghavan St., North Dibajee, Farmanieh, Tehran, 19857 Iran (Islamic Republic of)
AU: Braunmiller, J
EM: jochen@sed.ethz.ch,
AF: Swiss Seismological Service, ETH-Hoenggerberg / HPP P 12.1, Zurich, Ch-8093 Switzerland
AU: Thybo, H
EM: thybo@geol.ku.dk
AF: Geological Institute, University of Copenhagen, Oster Voldgade 10, Copenhagen, 1350 Denmark
AB: The newly installed broadband seismic network of Iran, at present, consists of 12 stations distributed across the country. We combine these high-quality data with data from IRIS broadband stations in neighboring countries to perform full-waveform regional moment tensor inversions of Iranian earthquakes. The station distribution is relatively sparse. We thus use data up to 1200 km epicentral distance and perform low frequency (f < 0.033 Hz) inversions. Preliminary results indicate that the use of regional data lowers the earthquake analysis threshold to about magnitudes 4-4.5, which is an order of magnitude less than routine teleseismic inversions. We currently derive suitable crustal models for various source-receiver geometries before analyzing the large number of moderate-to-strong earthquakes that occur in Iran. Within a short time span, we expect to build a large moment tensor database, which significantly expands the existing databases and provides improved constraints for seismotectonic studies, earthquake size calibration and seismic hazard assessments.
DE: 7215 Earthquake source observations (1240)
SC: Seismology [S]
MN: Fall Meeting 2005