West coast = earthquakes.
East coast = tornadoes.
Having just recently had F2/F3 tornadoes touch down in our county....they can be devastating.
Don't kid yourself. A large extremely devastating earthquake is far more likely in the Eastern USA than a devastating tornado in, say, CA. There was a huge quake in the Missouri Valley in the 19th century:
http://en.wikipedia.org/wiki/1812_New_Madrid_earthquake
1812 New Madrid earthquake
The 1811-1812 New Madrid Earthquakes (pronounced /nuː ˈmædrɨd/) were an intense intraplate earthquake series beginning with an initial pair of very large earthquakes on December 16, 1811.
These earthquakes remain the most powerful earthquakes ever to hit the eastern United States.[1] These events, as well as the seismic zone of their occurrence, were named for the Mississippi River town of New Madrid, Louisiana Territory, now Missouri.
There are estimates that the earthquakes were felt strongly over roughly 130,000 square kilometers (50,000 square miles), and moderately across nearly 3 million square kilometers (1 million square miles). The historic 1906 San Francisco earthquake, by comparison, was felt moderately over roughly 16,000 square kilometers (6,000 square miles).
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Further down at that page on the New Madrid earthquakes of 1812:
Recurrence potential
In a report filed in November 2008, The U.S. Federal Emergency Management Agency warned that a serious earthquake in the New Madrid Seismic Zone could result in
"the highest economic losses due to a natural disaster in the United States," further predicting "widespread and catastrophic" damage across Alabama, Arkansas, Illinois, Indiana, Kentucky, Mississippi, Missouri and particularly Tennessee, where a 7.7 magnitude quake or greater would cause damage to tens of thousands of structures affecting water distribution, transportation systems, and other vital infrastructure.[18]