昆明台附近区域地震尾波Q值分析  

Analysis on seismic coda Q in a region nearby Kunming station

作　　者：马力[1,2] 雷湘鄂[1] 孙和平 

机构地区：[1]中国科学院测量与地球物理研究所,动力大地测量重点实验室,中国武汉430077 [2]中国科学院研究生院,中国北京100049

出　　处：《地震学报》2010年第6期670-679,共10页Acta Seismologica Sinica

基　　金：国家自然科学基金项目(40730316;40974046);中国科学院重要方向性项目(KZCX2-YW-133;KZCX2-YW-Q08-2);湖北省自然科学基金(2008CDB389)资助

摘　　要：采用Aki和Chouet的地震尾波单次散射模型,从IRIS台网下载昆明台记录到的200km范围内182次地震事件共546条宽频带观测资料.根据震中距的大小和地震分布的成丛性,在昆明台附近划分6个小区块,并计算了各区块对应散射椭球体内的尾波Qc值.计算得到这些散射椭球体内介质品质因子Q0在40—55之间,频率相关系数η在0.96—1.06之间.表明该地区是以低Q高η值为特征的构造活跃区.This study uses the single scattering model of seismic coda waves proposed by Aki and Chouet.546 broadband seismic records from 182 earthquakes nearby Kunming station,with epicentral distances less than 200 km,were downloaded from IRIS website. According to epicenter distances and earthquake clusters,earthquakes in 6 sub-regions were selected for studying coda Qc in the volume of corresponding scattering ellipsoids. The calculated Q0 values and η factors are about 40—55 and 0.96—1.06,respectively,suggesting that the study region is a tectonically active zone characterized with low Q0 and high η value.

关 键 词：IRIS台网资料 昆明台 地震 尾波Q值 单次散射 

分 类 号：P315.31[天文地球—地震学]