The Worst Disaster of Its Kind

7月 16, 2010 · Posted in 未分類 

This quake was felt over a wide area, and, but for the sparse settlement of the country, would probably have caused great havoc. Many people think of a severe earthquake as consisting of a violent heaving or lurching of the earth’s surface, but such movements, when they occur, are only incidental. The essential feature of an earthquake is a series of rapid vibrations in the elastic rocks of the earth’s crust, caused by a sudden jar, which occurs, as a rule, some miles underground.

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