When:
December 6, 2017 all-day
2017-12-06T00:00:00-07:00
2017-12-07T00:00:00-07:00

Dec 6, 1811. New Madrid, MO. Most prolonged series of earthquakes in US history occurred not in California, but in the Midwest. Lasted until Feb 12, 1812. There were few deaths because of the sparse population. These were the most severe earthquakes in the contiguous US; those higher on the Richter scale have all occurred in Alaska.

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