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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.
BBC2y
Plate tectonic theory – WJEC
A large scale landform found along a conservative plate boundary is a fault line. One of the most active fault lines in the world is the San Andreas fault line in California, USA.