Lg-wave attenuation relationship and site response of stations in Zhejiang area

Based on the spectral ratio data， the Lg-wave attenuation relationship along a specific path across Taiwan Strait and the site response from 36 stations in Zhejiang area were calculated by using the joint inversion method of field response and the path attenuation. We used the data of 355 M_S≥4.0 earthquakes during the period of 2007—2012, which were recorded by Zhejiang digi-tal seismic network in Taiwan region. During the calculation process， the data in the frequency range of 1—7 Hz were selected with the interval of 0.2 Hz. The attenuation relationships are γ_UD(f)=0.0055f^0.94， γ_NS(f)=0.0064f^1.11 and γ_EW(f)=0.0048f^0.90 in U--D， N--S and E--W direction. The site response at high-frequency end of Qingyuan station showed an obvious amplification effect， meanwhile， the site response of the other 35 stations are nearly equal without obvious direction characteristic. Furthermore， the abnormal results were analyzed and verified， suggesting the results in this paper be correct and reliable.