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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.
A total of 546 broadband observations of 182 earthquakes recorded within 200km from Kunming Station were collected from IRIS network using the single wake scattering model of Aki and Chouet. According to the magnitude of the epicentral distance and the clumping of seismic distribution , Six sub-blocks are divided near Kunming station, and the coda Qc values of the corresponding scattering ellipsoid of each block are calculated.The Q0 of the medium in these scattering ellipsoids is between 40-55, and the frequency correlation coefficient η is between 0.96-1.06, indicating that the area is characterized by low Q high η value of tectonic activity area.