江苏地区介质非弹性衰减和场地响应研究

选取江苏数字地震台网在2001年1月-2010年7月记录到43次高质量数字地震波形,采用Atkinson(1992)和Moya(2000)的方法,反演得到江苏地区的介质非弹性衰减特性和场地响应.

Study on inelastic attenuation and site response in Jiangsu area

In this paper, we inversed the inelastic attenuation of medium and site response in Jiangsu area with the selected high-quality waveform of 43 earthquakes recorded by Jiangsu digital seismic network during January 2001 to June 2010 by the method of Atkinson （1992） and Moya （2000）. The results showed that the relation between medium quality factor with frequency in Jiangsu area is Q（f） =320.8 f0.5671. At the same time, we also calculated absolute site response of 32 digital seismic stations, the results showed that 1--10 Hz site response changes within the frequency bands from 1. 264 to 7. 184, the average is about 2. 056. A re- gional change characteristics is also revealed. Loose deposition site response in the middle region was largest, average of about 2. 739 at 1 10 Hz frequency range, indicating that amplification effect for seismic signal. Limestone in northern Jiangsu Province and mixing granite and granite gneiss in the central and western regions, site response in the 1--20 Hz frequency range, and the value of the minimum, the average is about 1.83. Site response of a small number of stations in 10--20 Hz frequency band is less than 1.