Abstract We select the waveform data of 127 ML≥3.0 earthquakes recorded by 36 stations of Chongqing digital seismic network from 2010 to 2020. Using the joint inversion method of Lg-wave attenuation parameters and station site response, we obtain the attenuation relationship between the three directions of Lg-wave (UD, EW, NS) at the frequency of l to 7 Hz, which is QUD(f)=173.6f0.77,QEW(f)=154.9f0.78, QNS(f)=157.6f0.73. The study area is a tectonic active area with low Q0 value and high frequency dependence. We calculate the site responses of 36 seismic stations. The results show that the amplitude curve of most stations is relatively smooth, and the site responses of each station are different. Among them, the site response curves of SHG, PAL and JIP stations have abnormal amplification in some frequency band. We select the seismic observation reports of 642 ML≥2.0 to correct the site response of stations with amplification effect. The average magnitude of most stations is closer to the average magnitude of the network, the correction effect of CQT, SHG and HCB stations is obvious, and the influence of medium attenuation of some stations on seismic wave amplitude is greater than that of site response.
Wang Jian,Zhu Xinyun,Shao Yuanyuan et al. Lg-Wave Attenuation, Station Site Response and ML Determination in Chongqing Region[J]. jgg, 2023, 43(6): 633-640.
Wang Jian,Zhu Xinyun,Shao Yuanyuan et al. Lg-Wave Attenuation, Station Site Response and ML Determination in Chongqing Region[J]. jgg, 2023, 43(6): 633-640.