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“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。其极震区在现宁夏自治区海原一带,当地山崩 Introduction The Haiyuan earthquake on December 16, 1920 was one of the largest earthquakes in modern history in China with a magnitude of 8.5. The scope of the earthquake was extremely large. According to the information recorded in Beijing, “the lights shook and the dizziness was caused by the lights”, the “shackles of hanging lights and shackles” in Beijing, the “stucco” in Shantou, the “ Most people feel the earthquake, ”and even the observatory near Haiphong in Vietnam has“ stopped the clock. ” Its earthquake area in the Haiyuan area of ​​Ningxia Autonomous Region, the local landslides