ESTIMATION OF THE QUALITY FACTOR AND SOURCE PARAMETERS OF WEST OF IRAN FROM ACCELERATION SPECTRA OF THE TAZEHABADKERMANSHAH EARTHQUAKE 2018

Strong earthquakes occurred on the 26th of August 2018 (MW 5.9) in the Kermanshah Province, West of Iran.High-frequency strong-motion data of this earthquake has been analyzed to determine the source parameters and Qβ(f) by inversion of the recorded data. We have used the data from a local network of 26 acceleration records for the main shocks to estimate Q-relationship in 26 stations. The seismic hazard map for this region illustrates that most of the area in this province is located within high relative risk and characterized by a large number of heterogeneities. For frequency band of 1 to 20 HZ, the frequency-dependent attenuation for this region found to be Qβ(f)=(101±19)f (0.76±0.05). The authenticity of achieved Qβ(f) relation is checked by comparing the source spectra in various stations with the theoretical spectra. Low values of the coefficient (Q < 200) in the Qβ(f) relation suggest that the region is seismically and tectonically active.

Keywords:

Source Parameters , Shear Wave , Quality Factor , Strong Motion Data