The 4.8-magnitude earthquake on the East Coast Friday came from ancient dormant faults. The faults formed when two continents collided about 500 million years ago, creating the Appalachians and ...

Earthquakes are common on the West Coast, with multiple plate boundaries like the San Andreas fault making geologic activity more likely. They are rarer on the East Coast, but they do happen .

The earthquake that just shook the East Coast was caused by one of dozens of ancient fault lines that have lain dormant for hundreds of millions of years, top scientists announced on Friday ...