Since 1950 there have been about 20 quakes with a magnitude above 4.5, according to the United States ... slippage along fault lines that generate earthquakes relatively often. East Coast quakes ...

The United States Geological Survey is urging ... but a byproduct of the East Coast’s unique geology of ancient fault lines and rock composition. “Earthquakes in this region are uncommon ...

Since 1950 there have been about 20 quakes with a magnitude above 4.5, according to the United States ... slippage along fault lines that generate earthquakes relatively often. East Coast quakes ...

Since 1950 there have been about 20 quakes with a magnitude above 4.5, according to the United States Geological Survey ... causing stress and slippage along fault lines that generate earthquakes ...