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利用WWSSN长周期远场P波的初相、破出相和终止相研究了1976年8月16日、22日和23日松潘三次大震的震源断层面破裂错动传播的全过程,判定了发震断层面和确定了它们的震源动力学参数。由较弱的P波初相求得三次大震的始破裂区长度分别为8、5和6 km。它们均为双侧破裂,震源体的破裂长度分别为73、43和52km。由于震源区存在重叠现象,因此,总的震源尺度仅为90 km。由破出相确定8月16日松潘大震的震源深度为9 km。此外,研究还发现,显著的终止相和较大的破裂速度与震源端部存在调整单元有关。
The whole process of fault rupture propagation in the source fault plane of the Songpan earthquake on August 16, 22, 23, and August 1976 was studied by using the primary phase, broken-out phase and the termination phase of the long-period P-wave in WWSSN. Seismogenic fault planes and determine their source kinetic parameters. The initial rupture length of three large earthquakes obtained from the weaker P-wave primary phase are 8, 5 and 6 km, respectively. Both of them are double-sided rupture, and the rupture lengths of focal body are 73, 43 and 52km respectively. Due to the overlap of source regions, the total source size is only 90 km. Confirmed by the rupture phase The focal depth of the Songpan earthquake on August 16 was 9 km. In addition, the study also found that significant termination phase and larger rupture velocity correlate with the presence of adjustment units at the source end.