A Canadian-led study of major 1811-12 central U.S. earthquakes has identified a possible driving mechanism for intraplate seismicity.
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Moderator: Astro
They found remnants of the ancient Farallon plate -- a slab of crust swallowed beneath the western North American continental margin nearly 70 million years ago -- continues to descend into the deep mantle under central North America -- possibly producing modern seismic hazards in the central Mississippi River Valley.