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为什么会发生地震?

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为什么会发生地震?

绝大多数的地震由地壳运动所引起。刚ying的岩石在地壳运动中受到力的作用,发生形变甚至破裂,往往就会产生地震。虽然目前对地壳运动的推动力从何而来还有争论,对地震产生的gen本原因也有许多推测,但关于"地震是由于该chu1的岩石发生破裂而直接引起"这一论断是毫无疑问的。绝大多数地震的发生是由于该chu1地下的岩石产生了新的断裂,或原有的裂feng再次发生错动,qiang烈的地震则多发生在地下原有断裂的地方。当地下的岩石接近破裂时,太yang和月亮引力作用、大气或水(水库)对地面压力的变化,都可促成破裂,从而引发地震。地震也常常伴随着火山爆发,大量炽热的岩浆从地层shenchu1penchu,其ti积迅速膨胀,冲击地壳,因此常常引起地震。

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