The combined effects of soft rock sites and anelastic attenuation factor have been separated and determined respectively by(using) this method.

The inelastic attenuation model of media in the Sichuan Basin region has been studied by using the joint conversion of genetic algorithm based on the waveform data recorded by Sichuan Digital Seismic Network.

In this paper, according to the relationship of observation spectrum with source spectrum, travel-path attenuation factor and site effect, we use the digital seismic data of moderate-small earthquakes to invert the soft rock site effect and S wave inelastic attenuation under the constraint of site effect, and determine the parameters of path and site.

Using 487 pieces of digital oscillograms of 19 seismic events recorded at 32 seismologic stations located on Ordos massif and its surroundings, we calculate the parameters of three segments attenuation and the relation of inelastic attenuation Q value with frequency in the crust of Ordos Massif, the site responses of 32 stations and the source parameters of 19 events by the genetic algorithm.

According to 437 horizontal-component seismograms recorded at 21 stations of Gansu Digital Seismic Network,we used Genetic Algorithm and Atkinson s method to study the inelastic attenuation value Q of the northeastern margin of Qinghai-Tibet plateau and the site response of each station based on the trilinear geometrical spreading model.