6. New Madrid Fault Line
Length: 150 miles
We are continuing our list of biggest fault lines in US with New Madrid Fault Line that covers five states: Illinois, Missouri, Arkansas, Kentucky, and Tennessee. According to some scientists, it has a potential to produce a massive earthquake, on par with those expected in Cascadia and San Andreas zones. To make matters worse, it would appear that it is long overdue for a shake or two.
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