16258

Analysis of the March 13, 2005 Earthquake in Southeastern Iran Based on Teleseismic and Regional Distances

Mostafazadeh Mehrdad نويسنده

153

162

10

ABSTRACT: The treatment of the seismic source inverse problem, when waveform data are available, is simple and elegant using synthetic se ismog ram formalism . This study constrains source parameters of the March 13, 2005 earthquake by analyzing body wave seismograms in teleseismic and regional distances. The results from waveform modeling indicate that source depth was 32km and that it was a normal mechanism with a small strike slip component. The duration ofsource time fun ction (STF) is approximately 5sec. Regional determination of body wave (S) sp ectra are used to es timate the parameters of seismic moment (Mo = 10.45 x 1025dyne-cm) , corne r frequen cy (fo=0.54hz), source dimension (R=2.5km) and stress drop ( .1cr = 0.26 x1()4 bar) . Comparison between obtained results and the Harvard CMT solution data show that there is some difference in common parameters, especially in the depth value and seismic moment (the depth value and seismic moment reported by Harvard is 56km and 1.17x 1025dyne-cm respectively). Scatter in the seismic mom ent values is caused by suchfactors as the site conditions and errors in the radiat ion patt ern corrections.

1200035