山东数字地震台站场地响应估算

Calculation of site response of digital seismic station in Shandong Province

为了建立山东省数字地震台站场地响应数据库,选取山东区域数字地震台网自2009年4月至2012年1月记录的M_L≥2.5地震事件,通过信噪比方法挑选出质量较高的86次地震,采用互相衔接的三段几何衰减模型,基于遗传算法,利用Moya等方法对山东省36个地震台站进行场地响应测算。其中35个台站未显示明显的放大作用,聊城台场地响应变化起伏较大,高频部分放大明显,烟台、招远、即墨、五连、菏泽台场地响应总体表现出一定衰减作用。

For the construction of database for site response of digital earthquake stations in Shandong Province,86 high quality earthquake events were chose from events ML≥2.5 recorded by regional digital seismic network of Shandong Province from Apr.2009 to Jan.2012 by SNR method.The cross cohesion trilinear geometrical spreading model,the genetic algorithm and Moya method were combined for site response calculation of 36 seismic stations.The result shows that the amplification effect of 35 seismic stations is not obvious.While the site response of Liaocheng Seismic Station varies significantly,the high-frequency part magnified obviously.Attenuation effects were exhibited by the site responses of Yantai Seismic Station,Zhaoyuan Seismic Station,Jimo Seismic Station,Wulian Seismic Station,Heze Seismic Station.