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地动山摇,天崩地裂的大地震,给人类带来毁灭性的灾害。1976年7月28日,我国唐山发生7.8级大地震,把一个中等城市给毁灭了。1999年9月21日,我国台湾省南投县以东发生7.5级大地震,主震后几天里,余震发生一万多次,最大的余震达到6.9级和7.1级,使灾害雪上加霜。地震是一种不可抗拒的自然灾害。如今,某些超级大国正在利用这种自然灾害,研制一种叫地震弹的武器,人为制造大地震,使敌对国在大地震中毁灭,不战自亡。世界上95%以上的地震,发生在平均厚度33公里的地壳层中。地壳的断裂变动造成的地震,称之为构造地震。3%的地震来源于地壳下面的地幔层。此外,火山爆发,洞穴坍塌等也可造成地震,但其数量和能量都很
Earthshaking, earthshaking earthquakes, devastating damage to mankind. On July 28, 1976, a magnitude 7.8 earthquake struck Tangshan in our country, destroying a medium-sized city. On September 21, 1999, a magnitude 7.5 earthquake struck east of Nantou County, Taiwan Province of China. After a few days in the main shock, more than 10,000 aftershocks occurred and the largest aftershocks reached 6.9 and 7.1 levels, making the disaster worse. Earthquake is an irresistible natural disaster. Today, some superpowers are using this natural disaster to develop a weapon called a seismic bomb to artificially create a major earthquake that will allow hostile states to be destroyed in a major earthquake and will not be on their own feet. Over 95% of the earthquakes in the world occur in the crust at an average thickness of 33 km. Earthquake caused by changes in the crustal fracture, known as the tectonic earthquake. Three percent of the earthquakes come from the mantle beneath the crust. In addition, volcanic eruptions, cave collapse, etc. can also cause earthquakes, but both in terms of quantity and energy