In their article, Kochkin and Crandell (2004) make two assumptions that have a profound impact on their results. They assume a soil amplification of 1.6 (NEHRP site class D for short-period structures) for St. Louis in 1811-1812, and they assume that the earthquake that caused the damage in St. Louis was the event that occurred at approximately 2:15 am local time on 16 December 1811.

In 1811, the population of St. Louis is estimated to have been 1,200, and the settlement covered an area of about 7.6 square miles bordered by the Mississippi River to the east, present-day...

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