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地震是一种自然现象。全世界每年大约发生500万次地震,其中8级和8级以上的地震大约发生1～2次,7～7.9级地震大约发生18次,5～6.9级地震大约发生120次,人们能察觉到的小地震大约发生6200次。近几十年来,在太平洋沿岸和地中海地区这两个活动地震带上的一些国家,多次发生了大地震。最大的一次是1960年5、6月间,在智利接连发生的大地震中,一次震级高达8.9级,震中烈度11度。这次地震的特点是震次多,震级高,持续时间长,波及面广,引起了地面下沉,滑坡坍方,火山爆发,海啸突起,造成灾情相当严重。从智利首都
Earthquakes are a natural phenomenon. About 5 million earthquakes occur each year in the world. Among them, magnitude 8 and magnitude 8 earthquakes occur about one or two times. About magnitude 7 to 7.9 earthquakes occur about 18 times. About magnitude 5 to magnitude 6.9 earthquakes occur about 120 times. People can perceive that The small earthquake occurred about 6,200 times. In recent decades, a number of major earthquakes have occurred in several countries on the active seismic belts along the Pacific coast and the Mediterranean Sea. The biggest one was in May and June of 1960. In a series of earthquakes in Chile, one magnitude was 8.9 and the epicenter intensity was 11 degrees. The earthquake was characterized by many earthquakes, high magnitude, long duration, wide spread, caused ground sinking, landslides, volcanic eruptions, tsunami prominent, causing serious damage. From the capital of Chile