甘肃地区S波非弹性衰减Q值研究  

Q Values of S Wave Inelastic Attenuation in Gansu Region

作　　者：陈继锋[1] 赵翠萍[2] 杨立明[1] 

机构地区：[1]中国地震局兰州地震研究所,甘肃兰州730000 [2]中国地震局地震预测研究所,北京100036

出　　处：《地震》2010年第1期125-130,共6页Earthquake

基　　金：中国地震局行业专项(200708026);中国地震局兰州地震研究所青年基金(2009265)资助

摘　　要：文中利用新建"十五"数字化地震观测网络项目记录到的甘肃地区地震波形资料,研究了甘肃地区S波的非弹性衰减Q值,得到甘肃东南地区Q值与频率的关系为Q(f)=374.0f0.3084;祁连山中东段地区Q值与频率的关系为Q(f)=693.6f0.2865。从分区Q值研究结果看,各分区之间存在较大差异,显示出了Q值空间分布的非均匀性特征,这种区域差异性与甘肃地区构造活动、地震活动、地壳速度结构及热活动状态的区域差异性有较好的一致性,活动强烈、高热活动以及低速区为相对低Q值区,地震波衰减较快。By using of wave data from the Lanzhou digital seismic network, quality factor Q values of S wave inelastic attenuation had been studied in Gansu region. It has been obtained that the frequency-dependent inelastic attenuation Q value is Q（f）= 374.0^0.3084 in the southeastern Gansu, and Q（f）=693.6f^0.2865 in the middle-east segment of the Qiliansban. The results show that there exists great difference in the subarea Q values, presenting the heterogeneity of Q value space distribution. The Q value is lower in southeastern Gansu area, and higher in the middle-east segment of the Qilianshan. These spatial differences of Q value distribution is in accordance with the regional difference of tectonic activity, seismieity and geothermal structures in Gansu region. The zones with intensively tectonic activities and higher geothermal activities belong to low Q value zones, where seismic waves attenuate more rapidly.

关 键 词：甘肃地区 联合反演 非弹性衰减Q值 SH波 

分 类 号：P315.7[天文地球—地震学]