“烨烨震电,不宁不令。百川沸腾,山冢崪崩。高岸为谷,深谷为陵。” ——《诗经·小雅》 地震,像刮风下雨一样,是一种自然现象。地球上每年大约发生500万次地震,人们能感觉到的只有5万多次,能造成严重破坏的大地震一年只有几次。但是,地震一旦发生,就会给人类带来巨大的人员伤亡和财产损失。甚至是灭顶之灾。世界地震史上,一次死亡20万人以上的有4次,全在中国,其中2次就发生在近一百年里。 20世纪,又是一个震灾频频的世纪。 旧金山大地震拉开了20世纪震灾的序幕 “Ye Ye Zhendian, restless not. Baichuan boiling, mountain mound collapse collapse. High bank for the valley, deep valleys.” - “Book of Songs Xiaoya” earthquake, like a windy rain, is a natural phenomenon . About 5 million earthquakes happen on Earth every year, and people can only feel it in more than 50,000 times. There are only a few earthquakes that can cause serious damage. However, once an earthquake occurs, it will cause huge human casualties and property losses to human beings. Even out of disaster. In the history of world earthquakes, there were four deaths of more than 200,000 at a time, all in China, of which two occurred in nearly a hundred years. The twentieth century, but also a century of frequent earthquakes. The earthquake in San Francisco kicked off the tornado of the 20th century