摘要
引言 1920年12月16日的海原大地震是我国近代史上最大的地震之一,震级达8.5级。地震时波及范围特别大,据有关资料记载:北京“电灯摇动,令人头晕目眩”,上海“时钟停摆,悬灯晃动”,广州“掉灰泥片”,汕头“客轮荡动”,香港地区“大多数人感觉地震”,甚至越南海防附近的观象台上也“时钟停摆”等。
On December 16,1920,a great earthquake of magnitude of 8.5 occurred in Haiyuan.The felt radius of the shock was over 1,800 kilometers.Its pleistoseismic zone was located in Haiyuan,Ningsia Province.The surface fault caused by the earthquake was more than 200 kilometers in length.This paper gives an account of and discusses the macroscopic phenomena during the earthquake,the foreshock and aftershock activities,the geological conditions for the formation of the earthquake,the characteristics of the activities of the earthquakes in history with regard to time and space in the areas around the epiccntral region,some precursory phenomena of the great earthquake,and finally the external triggering conditions and epiccntral migration after the occurrence of the earthquake.It is pointed out in this paper that the energy of the great earthquake was supplied by the relative movement of the three great tectonic masses in West China which are different in geological features.This great earthquake had precursors before its occurrence.The activities of the moderate earthquakes around the epicentral region before and after the great earthquake seemed to have certain regularities with respect to time and space.
出处
《地球物理学报》
1976年第1期42-49,共8页
Chinese Journal of Geophysics
