Lot of faults and zones in the US nobody much talks about. I learned about New Madrid when I lived in Memphis. Geologists say it lets go very infrequently but when it does, its big.
I saw a journal kept by a riverboat captain where he described the last New Madrid quake. For a brief time, there was a waterfall on the Mississippi and the river ran north for a short time. The damage from one like that today would be pretty devastating.
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