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我国是一个多地震的国家,地震活动十分频繁。据记载,我国绝大多数省分都发生过六级以上地震,在近七十多年来,已发生五百多次六级以上的地震。我国地震活动的特点是分布广、震源浅、强度高。全国面积有三分之一以上处于七度或七度以上地震区,绝大多数是二、三十公里深的浅源地震。由于震源浅、强度大,加之我国地震区现有房屋很多不符合抗震要求,因此,历次大地震曾使我国遭受巨大损失,一九七六年唐山地震的教训更为严重。
China is a country with multiple earthquakes and earthquakes are very frequent. According to records, most provinces in China have experienced earthquakes with magnitudes of more than six. In the past 70 years, more than 500 earthquakes with magnitudes of more than six have occurred. The seismic activity in China is characterized by its wide distribution, shallow source, and high intensity. More than one-third of the country’s area is in areas of seven or seven degrees of earthquakes, and the vast majority are shallow earthquakes that are two or three kilometers deep. Due to the shallow source and high strength, together with the large number of existing buildings in the seismic area of our country that do not meet the seismic requirements, the major earthquakes in the past caused great losses to China. The lessons of the Tangshan earthquake in 1976 were even more severe.