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December 29,2004

什麼是海嘯？

資料來源：新華社

海嘯是一種具有強大破壞力的海浪。水下地震、火山爆發或水下塌陷和滑坡等大地活動都可能引起海嘯。

地震發生時，海底地層發生斷裂，部分地層出現猛然上升或者下沉，由此造成從海底到海面的整個水層發生劇烈“抖動”。

這種“抖動”與平常所見到的海浪大不一樣。海浪一般只在海面附近起伏，涉及的深度不大，波動的振幅隨水深衰減很快。地震引起的海水“抖動”則是從海底到海面整個水體的波動，其中所含的能量驚人。

Posted by tsunamihelp at 樂多Roodo! │00:27 │回應(116) │引用(41) │認識地震‧海嘯

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