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The New Madrid fault systems extends 120 miles southward from the area of Charleston, Missouri, and Cairo, Illinois, through New Madrid and Caruthersville, following Interstate 55 to Blytheville and on down to Marked Tree, Arkansas. It crosses five state lines and cuts across the Mississippi River in three places and the Ohio River in two places.

The San Andreas Fault in California is about 810 miles long, and the Cascadi Fault just offshore from Oregon and Washington is about 650 miles long. (Sorry for the finger-check - it should be the Cascadia Fault.

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13y ago
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13y ago

THE NEW MADRID FAULT SYSTEM EXTENDS 120 MILES SOUTHWARD from the area of Charleston, Missouri, and Cairo, Illinois, through New Madrid and Caruthersville, following Interstate 55 to Blytheville and on down to Marked Tree, Arkansas. It crosses five state lines and cuts across the Mississippi River in three places and the Ohio River in two places.

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12y ago

I don't really know all of them for sure, I but I do know the San Andreas fault line. Which runs somewhere along west California.

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14y ago

New Madrid Fault and San Andreas Fault

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Q: Two important geological faults in the US?
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