海南岛介质非弹性衰减及场地响应反演

利用海南数字地震台网18个地震台274条波形资料，运用遗传算法反演海南岛非弹性衰减系数及台站场地响应，计算得到海南岛非弹性衰减Q值随频率f的关系为Q（f）=343.7f^0.42，说明海南岛适中Q值区域，地壳相对稳定。18个地表台站的场地响应场与频率有关，其中：7个台站的场地响应接近1，平稳变化；2个台站在高频部分衰减；7个台站的场地响应小于1，变化平稳； 2个台站低频部分场地响应接近1，高频部分放大。

The inversion for inelastic attenuation and site response of each seismic station in Hainan island

Based on 274 pieces of digital seismograms recorded at 18 seismologic stations located in Hainan region and relation of inelastic attenuation Q value with media frequency in the crust of this area, the site responses of 18 stations were calculated with the genetic algorithm. The results indicate that the frequency-dependent relation of inelastic attenuation value Q in the studied area is estimated as:Q(f)=343.7f^0.42, which indicates that the province is a low Q-value area with a relatively active crust and strong seismic activity. The results show that the site effects of the 18 stations are related to the frequency. The site effects of 7 stations are close to 1 and vary stably; those of 2 stations attenuate at high frequency. The site effects of 7 stations are less than 1 and vary stably; Those of 7 stations show obvious attenuation at high frequency and close to 1 at low frequency.