青海地区S波非弹性衰减Q值、场地响应特征研究  

S wave inelastic attenuation and site response in Qinghai area

作　　者：马建新[1] 姚家骏[1] 陈继锋[2] 

机构地区：[1]青海省地震局,中国西宁810001 [2]中国地震局兰州地震研究所,中国甘肃730000

出　　处：《地震地磁观测与研究》2015年第3期38-42,共5页Seismological and Geomagnetic Observation and Research

基　　金：地震科技星火计划(XH14050Y);青海省地震科学基金(2012A04)联合资助

摘　　要：根据地质构造及地震台网分布特征,将青海地区分为柴达木盆地、青海东北部、青海东南部3个区域,运用青海地震台网记录的112条数字地震波形资料,利用Atkinson方法得到3个区域的非弹性衰减Q值随频率的关系,结果表明,柴达木盆地Q值最大,青海东南部Q值最小。采用Moya方法反演得到3个区域24个地震台的场地响应,其中15个台站的场地响应在频率域不平坦,9个台站稳定性相对较好,GOM(格尔木)作为国家基准地震台,具有良好的观测环境,场地响应曲线稳定。According to the geological structure the distribution of observation network, Qinghai area was divided into three subregions, including Qaidam Basin, the northeastern and southeastern of Qinghai. Based on the 112 digital seismic waveforms data recorded by Qinghai network, the inelastic attenuation Q value with frequency of these subregions are inversed by Atkinson＇s genetic algorithm, showing that the Q value of Qaidam Basin is maximum while the southeastern is minimum. Site responses of 24 stations in these subregions are inversed using the Moya method, the results indicate that site responses of 15 stations are uneven in frequency domain, the others have better stability,and as a standard station, GOM station has better observation conditions, making the site responses has no magnification nearly in frequency domain.

关 键 词：Q值 场地响应 几何衰减 

分 类 号：P315.2[天文地球—地震学]