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The East Coast earthquake came from a fault that's been asleep for hundreds of millions of years but suddenly reactivated
Instead, East Coast quakes come from stress that builds up on those ancient fault lines ... amount of weight that deformed the underlying rock in the crust," Fernando said.
Underwater fault line could produce major earthquake on the West Coast
A similar fault zone off the coast of Japan erupted in 2011 ... than other major fault lines because they have different rock ...