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From Yahoo! News:
How unusual was the magnitude-4.0 earthquake that struck southern Maine yesterday (Oct. 16)?
U.S. Geological Survey geophysicist Julie Dutton said it was larger than most but not too out of the ordinary for New England, where one or two minor earthquakes can be felt somewhere every year.
It's unclear what exactly caused the quake, Dutton told OurAmazingPlanet. "To pinpoint which fault it was - we don't have that information and we may never have that information," she said. The area lacks the extensive network of seismometers present in more tectonically active areas. There are many faults in the area, and the fault that was active yesterday was probably small and may never be active again, Dutton said.
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Re: The Facts Behind the Maine Earthquake
