1976年7月28日唐山7.8级地震发生后,唐山及邻近地区测震台网加密,检测能力提高,为测定大量余震的震级和震源深度提供了有利条件,对于研究震中区浅层应力的变化与余震的关系也提供了丰富的资料。本文选取1976年至1978年应力观测资料和此期间每旬中较大地震进行统计研究一、赵各庄应力站的概况 After the Tangshan M7.8 earthquake occurred on July 28, 1976, the seismographic network in Tangshan and its adjacent areas was enhanced in density and detection capability, which provided favorable conditions for the determination of the magnitude and source depth of a large number of aftershocks. The relationship with aftershocks also provided a wealth of information. This paper selects the stress observation data from 1976 to 1978 and the large earthquakes in every ten days during this period to conduct a statistical study I. Overview of Zhaogezhuang Stress Station