摘要
利用甘肃数字地震台网的波形记录,基于遗传算法,首先用Atkinson方法计算非弹性衰减系数,在此基础上用Moya方法同时反演震源参数和场地响应。反演结果表明:甘东南地区非弹性衰减Q值与频率的关系为Q(f)=404.2f0.264;9个台站中除了天水台,其余台站的场地响应均没有显示明显的放大效应,这与其均处于岩石地基的情况相吻合;研究区地震的应力降范围为1～70bar;震源参数拐角频率与地震矩、地震矩与震级之间存在较明显的依赖关系。
Using digital seismograms recorded by the Gansu Digital Seismic Network,the inelastic attenuation coefficient is calculated based on genetic algorithm and a method proposed by Atkinson.Then,the site response and source parameters are investigated by the Moya method.The inversion results indicate the frequency-dependent of inelastic attenuation Q value in the southeast area of Gansu is estimated as Q（f）=404.2f 0.264.Except the Tianshui station,the site response of the others do not show significant amplifications,which is consistent with their basement on rocks.The stress drops of 39 earthquakes range from 0.1MPa to 7MPa.It is also found the dependence of corner frequency on seismic moment,seismic magnitude.
出处
《中国地震》
CSCD
北大核心
2007年第4期383-392,共10页
Earthquake Research in China
基金
中国地震局"十五"项目"兰州市活断层探测与地震危险性评价"(1-4-28-1)资助
中国地震局兰州地震研究所论著编号:LC20070064
关键词
品质因子Q
值场地响应
震源参数
Q value of quality factor Site response Source parameter
