1999年岫岩地震序列尾波Q（下標 c）的變化過程

Using the Sato's single isotropic scattering model, the authors calculated the Scoda attenuation factor Q(subscript c) values of 1999 Xiuyan M(subscript L) 5.9 earthquake sequence at Xiuyan station and Yingkou station. And the temporal changes of Q(subscript c) in three components and 10 center frequencies are obtained for the two stations. Dividing the sequence into three time periods by the occurrence of two main quakes, the Q(subscript c) and frequency relation for the three time periods and total time sequence were calculated. The results show that Q(subscript c) increases in trend before the strong earthquake and decreases after the strong earthquake. The changes of Q(subscript c) vary at different stations and in different components. Compared it with Aki's single backscattering model, the authors believe that Sato's model is more reasonable for our data processing.