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地震和刮风、下雨一样是一种自然现象。当地下某处岩层突然破裂,或因局部岩层塌陷、火山喷发等发出了振动,并以波的形式传到地表引起地面的颠簸和摇晃,这种地面运动就叫地震,有人也叫它“地动”。据统计,世界上每年发生五百万次地震。人们对许多小地震并无感觉,只有仪器才能记录到,三级左右的有感地震每年发生约五万次,但它对人民的生命安全和工程建设并无危害;能造成严重破坏的地震,世界上每年平均约十八次。近年来在我国河北邢台、云南通海、昭通;四川甘孜和辽宁海城及唐山丰南地区
Earthquakes and windy, like rain is a natural phenomenon. Somewhere under the local rock suddenly burst, or due to local rock collapse, volcanic eruptions and other vibration, and in the form of waves spread to the ground caused by the bumpy and shaking, this earth movement is called earthquakes, some people call it “ground move”. According to statistics, five million earthquakes occur each year in the world. People do not feel much about many small earthquakes. Only instruments can record that an earthquakes of about three magnitude occur about 50,000 times a year, but it is not harmful to people’s life safety and construction. Any earthquake that can cause serious damage, The world averages about eighteen times a year. In recent years, Xingtai in Hebei Province in our country, Yunnan Tonghai, Zhaotong; Ganzi in Sichuan and Liaoning Haicheng and Tangshan Fengnan area