Earthquakes in U.S.A.-natural and otherwise

[packman]

Earthquake zones - areas you'd expect such as California. Few surprises in the mid-west and a few here and there. BUT, the blue boxed areas are man-made ones due to fracking and drilling. NOTE the one in middle of country :


"The probability of dangerous levels of ground shaking in some of these areas, such as the one that bleeds from central Oklahoma into southern Kansas, rivals that of California, the traditional earthquake king. “It was kind of a surprise,” says Mark Petersen, chief of the USGS National Seismic Hazard Mapping Project in Golden, Colorado."

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http://news.sciencemag.org/earth/2015/04/heartland-danger-zones-emerge-new-u-s-earthquake-hazard-map