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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
The earthquake that just shook the East Coast was caused by one of dozens of ancient fault lines that have lain ... a geologist at the US Geological Survey, said in a briefing on Friday.
Why epicenter of 3.9 earthquake between Hayward, Calaveras fault lines is significant
From Napa to Santa Cruz, many Bay Area residents say they felt the big jolt of a 3.9 earthquake on the Calaveras fault in the ...