Research on the Q_c Value of Coda Wave in Shaannan, Guanzhong Area and Its Adjacent Region
Meng Zhi-min · Northwestern Seismological Journal · 2005
According to the method of power spectrum analysis of individual dispersion model,using the wide-band digital waveform data recorded by Shaanxi digital seismograph network, the Q_c values of coda wave in 13 frequency bands in Guanzhong,Shannan and the adjacent areas are estimated. The result shows that the coda Q_0 values are in range of 37.54~78.59 with the average value of 58.44 in the 2t_s~35 s time window,and are higher in Qinling mountain chain region where the ascending motion is marked, otherwise are lower in Guanzhong basin and Shannan area. In the 2t_s~70 s time window, the Q_0 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.