S-wave attenuation and spectral decay parameter for the Avaj region, Iran, submitted for J. Asian Earth Sci

Abstract – The strong ground motions recorded during the 2002 Avaj earthquake have been used to estimate S wave attenuation, Qβ, and spectral decay parameter, κ, for the Avaj region. Qβ for shear wave is estimated as a function of frequency in the range of 0.6- 18 Hz. The results show that Qβ increases with frequency in the form of Qβ=62.7 f 0.9. Our estimates are within the estimated range for different parts of the world for Qo and n. The spectral decay parameter, κ, has been estimated from the high frequency of the spectra. The dependence of κ on the epicenteral distance for the Avaj region is also found