Likely cause for recent southeast US earthquakes: Underside of the North American Plate peeling off
The southeastern United States should, by all means, be relatively quiet in terms of seismic activity. It’s located in the interior of the North American Plate, far away from plate boundaries where earthquakes usually occur. But the area has seen some notable seismic events — most recently, the 2011 magnitude-5.8 earthquake near Mineral, Virginia that shook the nation’s capital.
Now scientists report in a new study a likely explanation for this unusual activity: pieces of the mantle under this region have been periodically breaking off and sinking down into the Earth. This thins and weakens the remaining plate, making it more prone to slipping that causes earthquakes. The study authors conclude this process is ongoing and likely to produce more earthquakes in the future.
“Our idea supports the view that this seismicity will continue due to unbalanced stresses in the plate,” said Berk Biryol, a seismologist at the University of North Carolina at Chapel Hill and lead author of the new study. “The [seismic] zones that are active will continue to be active for some time.” The study was published today in the Journal of Geophysical Research — Solid Earth, a journal of the American Geophysical Union.
Source: http://ncrenegade.com/editorial/likely-cause-for-recent-southeast-us-earthquakes-underside-of-the-north-american-plate-peeling-off/
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