Aftershock of the Earthquake

7月 16, 2010 · Posted in 未分類 

One of the most interesting cases of this kind is furnished by the seismic history of our own country. During the years 1811 and 1812 a remarkable series of shocks, now usually referred to as the “New Madrid earthquake,” occurred in the middle Mississippi Valley. In the course of a few months no less than 1,874 shocks were felt. Eight of these were very severe, and were perceptible over the whole of the then settled portion of the United States. This earthquake produced notable geographic changes; new islands came into existence in the Mississippi, new lakes were formed in neighboring valleys (one of them one hundred miles long), and old lakes disappeared.

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