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我们脚下的大地并不是平静的,有时,地面会突然自动地晃动起来,振动持续会儿后便渐渐地平静下来,这就是地震。如果地震引起的地面振动很强烈,便会造成房倒屋塌、山崩地裂,给人类生命和财产带来巨大的危害。 很多地震,在相当广阔的区域内可同时感觉到,但最强烈的振动只限于某一较小的范围,并且离这个范围越远,振动变得越弱,以致在很远的方就感觉不到了,为什么?这是因为,在振动最强烈处的地下,发生了急剧的变动,由它产生的振动以波
The earth under our feet is not calm, and sometimes the ground will suddenly and automatically shake itself. After the vibration lasted for a while, it gradually calmed down. This is an earthquake. If the earthquake caused by the ground vibration is very strong, it will cause the housing collapse, landslides, to human life and property tremendous harm. Many earthquakes can be felt in quite a wide area at the same time, but the most intense vibration is limited to a smaller area, and the farther away from this area, the weaker the vibration becomes, so that it feels far away Why? This is because, in the most intense vibration of the ground, a sharp change occurred, the vibration generated by it wave