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http://news.yahoo.com/Earth's-moving-mantle-leads-earthquakes-unusual-places-100843422.html
Yellowstone is a relatively hot area.
http://volcanoes.usgs.gov/observatories/yvo/
http://volcanoes.usgs.gov/volcanoes/yellowstone/monitoring_tomography.html
Then there is the New Madrid fault zone in the middle of the US.
http://dnr.mo.gov/geology/geosrv/geores/techbulletin1.htm
Researchers found that intraplate earthquakes — which occur in the middle, instead of at the borders, of tectonic plates — are influenced by convection, or heat-driven movements, of the molten mantle beneath the planet's cold, solid crust.
Although intraplate quakes make up a small percentage of overall earthquakes (98 percent of earthquakes occur at the boundaries of tectonic plates), they have been recorded at strengths of up to magnitude 7.0 and can be among the most disastrous temblors because they're unexpected, . . .
Yellowstone is a relatively hot area.
http://volcanoes.usgs.gov/observatories/yvo/
http://volcanoes.usgs.gov/volcanoes/yellowstone/monitoring_tomography.html
Then there is the New Madrid fault zone in the middle of the US.
http://dnr.mo.gov/geology/geosrv/geores/techbulletin1.htm