Genetic Algorithm Inversion The Media Attenuation Of Jiangsu Province And Stations Venue Response

With the completion of digitized earthquake net rhtoughout the nation, it is necessary to research a large amout of waveform materials and serve for anticipating and analyzing the earthquake. When wu research on waveform data, the attenuation characteristics of regional media and the various station site response coefficient is very important message.Using the waveforms(ML>3) recorded by Jiangsu digital seismic network since 2004, Jiangsu region as southern, central and northern Jiangsu region in the geological structure, showing some differences, and LiuHonggui, etc.(2004) has studied the southern region six stations in response to the venue and southern regions of medium attenuation, to comprehensive,reasonable figures of the Jiangsu network of site response and the media in Jiangsu attenuation, this study discusses the northern Jiangsu region and the whole region. The coastal areas of Jiangsu is a relatively frequent seismic activity areas, no separate discussion area lack of stations.The method used by Atkinson use three of the geonetric model of reasonable deduction attenuation of seismic waves recorded geometric attenuation, use genetic algorithm to calculate the inversion medium quality factor Q-switching; on the basic of the quality factor Q, Moya used a method to calculate the station site response coefficient and venues in response to the earthquake source spectral parameters. Comparative analysis of the results after the northern region of the quality factor with frequency, it is very close to central Europe ang Guangdong of China. It is identical between the quality factor Q0 and the earthquake activity. Because of the difference of the wave path, the distance of the earthquake and the site cause the quality factor Q different. Rock of the station is one of important factors that decide site response factor. Location and geological conditions of station is also factors that response to calculate site response,site amplification factor of the high geoglogical active great than site amplification factor of the low geoglogical active.