山东地区介质非弹性衰减关系与台站场地响应研究
Research of inelastic attenuation and site response of seismic stations in the Shandong area
董腾超 1苗庆杰 1殷海涛 1张春鹏 1李国一1
作者信息
摘要
利用山东地震台网及所接入周边省份共计 113 个台站(速度型观测)记录 329个ML≥2.0 地震波形资料,分别利用Atkinson反演方法和Moya方法,得到山东地区介质非弹性衰减关系和台站场地响应.其中,山东地区非弹性衰减关系式为Q(f)=416.7f 0.4728,场地响应计算结果表明:大部分台站台基良好,场地响应值在1-2上下波动;部分台站场地响应在高频部分存在放大效应,说明台基有一定风化;部分台站场地响应在高频出现衰减,说明台基可能存在松软沉积层.该研究可为山东地震台网计算地震震源参数提供更加全面的基础数据,对台站场地选址和评价、地震灾害评估和抗震工程设计均具有一定参考意义.
Abstract
Using seismic waveforms of 329 ML≥2.0 earthquakes recorded at a total of 113 stations(velocity-type observations)in the Shandong Seismic Network and the neighboring provinces accessed by the network,the inelastic attenuation relationship of the medium and the site response of the stations in Shandong are obtained by using the Atkinson inversion method and the Moya method,respectively.Among them,the inelastic attenuation relation in Shandong is Q(f)=416.7f 0.4728,and the results of site response calculation show that:most of the stations have good foundations,and the site response values fluctuate up and down in 1-2;the site response of some stations has amplification effect in the high-frequency part,which indicates that the foundations are weathered to a certain extent;and the site response of some stations has attenuation in the high-frequency,which indicates that the foundation may have loose sediments.Some stations show attenuation at high frequencies,indicating that there may be soft sedimentary layers at the base of the station.This study can provide more comprehensive basic data for the Shandong seismic network to calculate seismic source parameters and has certain reference significance for station site selection and evaluation,seismic hazard assessment,and seismic engineering design.
关键词
遗传算法/非弹性衰减/品质因子Q值/场地响应/震源参数Key words
genetic algorithm/inelastic attenuation/quality factor Q-value/site response/seismic source parameters引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
万方数据