The 4.8-magnitude earthquake on the East Coast Friday came from ancient dormant faults. The East Coast, however, is located in the middle of a plate and doesn't experience much of that movement. NOAAInstead, East Coast quakes come from stress that builds up on those ancient fault lines. The glaciers heavily weighed down and compressed the northern part of the East Coast. Though that weight has been lifted for more than 10,000 years, the Earth's crust is still rising back to its former shape.

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Persons: —, Jessica Jobe, Matt Rourke, Lingsen Meng, George Rose, Jobe, Ben Fernando, Johns Hopkins, Meng, Fernando, It's Organizations: East, Service, Geological Survey, UCLA Locations: East Coast, New Jersey, Mill, Lebanon , New Jersey, West, Hot Springs , North Carolina, West Coast, East, Johns, North America