关中、陕南及周边地区尾波衰减特性(Q_c)研究  

Research on the Q_c Value of Coda Wave in Shaannan, Guanzhong Area and Its Adjacent Region

作　　者：孟智民[1] 谢家树[1] 张宪[1] 

机构地区：[1]陕西省地震局,陕西西安710068

出　　处：《西北地震学报》2005年第1期75-79,共5页Northwestern Seismological Journal

摘　　要：根据单次散射模型的尾波功率谱分析方法,利用陕西数字地震台网宽频带数字地震波形记录资料,计算了关中陕南及周边地区13个频段的Qc值。结果显示:在2ts^35 s的时间窗内,Q0值在37.54~72.59之间,全区平均值为58.44,在上升运动显著的秦岭山脉值较大,关中盆地和陕南值较小;在2ts^70 s的时间窗内,Q0值在194.74~283.50 之间,全区平均值为186.79,莫霍界面高波速区值较大,低速区和低速梯度带值较小。According to the method of power spectrum analysis of indivi sing the wide-band digital waveform data recorded by Shaanxi digital s Qc values of coda wave in 13 frequency bands in Guanzhong, Shannan a estimated. The result shows that the coda Qc values are in range of 37. age value of 58.44 in the 2ts-35 s time window,and are higher in Qinli dual dispersion model, u where the ascending motion is marked, otherwise are lower in Guanzhong basin and Shannan area. In the 2ts-70 s time window, the Qc values are in range of 194.74-283.50 with the average value of 186.79,and are higher in wave highvelocity area of moho-discontinuity comparing with lower values in wave lowvelocity area and lowvelocity gradient belt.

关 键 词：单次散射 功率谱 尾波Qc 值时间窗 

分 类 号：P315.31[天文地球—地震学]