The effects of a 6.5 earthquake at the New Madrid fault are seen above. Numerals are based on the Mercalli scale. The effects in KC would be as follows:
Felt indoors by many people, outdoors by few people during the day. At night, some awakened. Dishes, windows, doors disturbed; walls make cracking sound. Sensation like heavy truck striking building. Standing motor cars rock noticeably. Dishes and windows rattle alarmingly.
However, the fault is capable of producing much larger earthquakes, and has done so in the past. One can just imagine the effects that a large (>7.5 on Richter scale) earthquake would have on Memphis and St. Louis. There are close to 4 million people in the greater metropolitan areas of those two cities combined.
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