A new model on the cause of Tangshan earthquakes in 1976

作     者：WANG Jian 

作者机构：1. Institute of Geophysics China Seismological Bureau 100081 Beijing China 

出 版 物：《Acta Seismologica Sinica(English Edition)》 (地震学报)

年 卷 期：2001年第14卷第5期

页      面：589-595页

核心收录：

学科分类：070801[理学-固体地球物理学] 07[理学] 0708[理学-地球物理学] 

基　　金：Institute of Geophysics  China Seismological Bureau fund 

主　　题：Tangshan earthquakes seismicity local weakening of crust 

摘      要：In this paper the shortages of explanations on the cause of Tangshan earthquakes in 1976 are pointed out. Earthquake phenomena around Tangshan earthquakes are analyzed synthetically, it is noticed that the most prominent seismic phenomenon are seismic denseness of ML=4, but ML=3 and ML=2 is not active in the same temporal-spatial interval, which occurred from 1973 to 1975. We think that the phenomenon should correspond to relative integrity of the crust medium under higher regional stress. Assuming that the seismicity in circumjacent region could reflect the jostling extent of surrounding plates toward the Chinese mainland, it is inferred that there are multi-dynamical processes in North China region in 1970s, which supply the basic dynamical source to Tangshan earthquakes. A model of multi-dynamical processes and local weakening of the crust is proposed to explain the cause of Tangshan earthquakes. This model could unpuzzle many seismic phenomena related to Tangshan earthquakes.