终止相的理论地震图—兼论唐山地震震源破裂过程

THE SYNTHETIC SEISMOGRAMS FOR STOPPING PHASESDISCUSSING THE SOURCE RUPTURE PROCESS OF THE TANGSHAN EARTHQUAKE

本文首先较为系统地回顾了终止相研究的历史、进展,对震源破裂过程产生终止震相的物理机制进行了讨论,并详细讨论了主事件分析法以及合成包含终止相的理论图的方法。在此基础上应用主事件分析法处理了唐山地震的实际资料,给出唐山地震的震源破裂过程的大致时空图象,同时计算了包括终止事件的合成图。结果表明,考虑破裂过程的终止事件可以较好地拟合P波观测图,从而进一步确认唐山地震震源破裂过程包括两次终止事件的可能性。此外本文还对唐山地震的震源环境以及调整单元的让位情况进行了讨论。

In this paper, the history and progress of study on stopping phase are reviewed systematically, and the physical mechanism of stopping phases in the source rupture process is discussed. The master-event analysis method and the synthetic seismogram method including stopping phase are discussed in detail. By using the master-event analysis method, the actual data of the Tangshan earthquake are processed, and we get the spatial-temporal picture of the source rupture process during the Tangshan earthquake, meanwhile, the synthetic seismograms including stopping events are calculated. The results show that with taking into account of stopping events of rupture process, the Pwave observed seismograms can be fitted better, the possibility is further confirmed that there existed two stopping events during the source rupture process of the Tangshan earthquake. Finally, the source environment of the Tangshan earthquake and the abdication of adjustment element are also discussed.