摘要
根据2007—2013年广西数字测震台网21个地震台的665条波形资料,运用三段几何衰减模型,采用Akinson方法多台多地震联合反演,得到广西地区非弹性衰减Q值,利用Moya方法进行台站的场地响应测算。结果表明:广西地区非弹性衰减Q值和频率f线性关系较好,Q(f)=366.3 f^(0.47);其中10个台站的场地响应在1附近,且随频率变化波动小;百色、桂林、梧州地震台场地响应随着高频增加而缓慢降低;钦州地震台低频部分较为平坦,高频部分有较为明显的放大效应;河池地震台低频部分较为平坦,在频率7 Hz以上快速下降;南宁地震台仪器通带范围的能量场地响应有明显的放大效应。
According to 665 waveform data of 21 seismic stations in Guangxi Digital Seismic Network from 2007 to 2013, using geometric attenuation of the third model fitting and Akinson meth- od, the inelastic attenuation Q value had been obtained in this paper. On basis of above works, the site response had also been calculated using Moya method. The results show that： there is a good linear relationship between inelastic attenuation Q value and frequency f, that is Q（f）=366.3f0.47. There are 10 of the 21 stations whose site response value were nearby 1 and had little fluctuatios accompanying with the frequency changes. The site re- sponses of Baise, Guilin and Wuzhou seismic stations decreased slowly along with frequency increases. The site responses of Qinzhou Seismic Station has a smooth low-frequency sec- tion, but its high-frequency part is more obvious amplification. The site responses of Hechi Seismic Station also has a smooth low-frequency part, and decreasing rapidly above 7 Hz. The site response of Nanning Seismic Station is apparent magnification.
出处
《地震地磁观测与研究》
2014年第5期15-20,共6页
Seismological and Geomagnetic Observation and Research
基金
桂科攻(12426001)
(1298005-2)
广西地震局三结合项目(GXJ2012004)联合资助
关键词
震源谱
几何衰减
Q值
场地响应
soure spectra, geometrical attenuation, Q value, site response
