Hot spot deep beneath North America could have triggered quakes

Hot spot deep beneath North America could have triggered quakes

Mantle plume might have left trail of hot rock under continental US

By Erin Wayman, 13:28 PM September 16, 2013

A hidden hot spot deep within the Earth could have set off seismic activity causing some earthquakes in the eastern United States.

Researchers have discovered a track of hot rock at the base of the North American plate, stretching from Missouri to Virginia. It marks a trail, they say, where the westward-drifting continent passed over a hot spot tens of millions of years ago. A hot spot is the top of a plume of abnormally hot, buoyant rock in the mantle that wells up like a blob in a lava la...

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