Variation Of Coda Wave Attenuation In Two Different Tectonic Areas In The Iranian Plateau, Alborz And Nw Zagros

The attenuation of coda wave in Alborz and NW Zagros has been estimated using the single backscattering (SBS) and the single isotropic scattering (SIS) methods at 9 frequency bands with central frequencies of 1, 1.5, 2, 3, 4, 6, 8, 12 and 16 Hz. The database consisted of 677 local earthquakes (418 events in the Alborz region and 259 events in the NW Zagros region) with the M-N magnitude range from 3.0 to 5.7. A total of 8,717 seismograms with signal-to-noise ratios of greater than 3 and epicentral distances less than 200 km were used. To investigate the depth variation of attenuation in this study, the coda quality factor Q, was estimated in each area at epicentral distance range of R<100 km and 100更多