@mashable Faults need to be mapped - new study claims that human activity could set off quakes on existing faults
http://bit.ly/1C2oBHy
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Scary if fault line was created recently that caused the earthquake *shiver*
#napaquake#napaearthquake http://on.mash.to/1zBeLbA@mashableThanks. Twitter will use this to make your timeline better. UndoUndo
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“
@mashable: Scientists scramble to map previously unknown fault that caused#Napa#earthquake http://on.mash.to/1zBeLbA ”Thanks. Twitter will use this to make your timeline better. UndoUndo
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@mashable encerioThanks. Twitter will use this to make your timeline better. UndoUndo
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