宁夏及邻区地震动衰减和场地响应的分区研究

摘要

Based on 294 digital seismograms recorded on 19 seismic stations of Ningxia Telemeterd Network, the attenuation of ground motion and site response of each station is investigated in the south and north of Ningxia Region. Assuming a trilinear geometrical spreading model, we obtained the attenuation function in the south and north of Ningxia Region: Q(f) = 503. 92f0.32 and Q(f) = 267. 6f0.80 ,respectively. The site responses of 19 seismic stations do not show significant amplifications expect Jingyuan station, which is basicly consistent with actual situation.%根据宁夏数字地震台网19个地震台的294条波形资料,研究宁夏南区及北区的衰减模型和各台站的场地响应.采用三段几何衰减模型拟合,得到宁夏南区和北区非弹性衰减Q值随频率f的关系分别为:Q(f)=503.92f0.23和Q(f)=267.6f0.580；19个台站的场地响应除泾源地震台外,其余台站没有显示出明显的放大效应,与实际情况基本相符.