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Earthquake risk increased for one-third of US

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By SETH BORENSTEIN
AP Science Writer

WASHINGTON (AP) - A new federal earthquake map dials up the shaking hazard just a bit for about one-third of the United States and lowers it for one-tenth of the nation.

The U.S. Geological Survey updated Thursday its national seismic hazard maps for the first time since 2008, taking into account research from the devastating 2011 earthquake and tsunami off the Japanese coast and the surprise 2011 Virginia temblor.

Most of the changes are slight. Project chief Mark Petersen said parts of Washington, Oregon, Utah, Oklahoma, Colorado, Wyoming and Tennessee moved into the top two hazard zones.

Parts of 16 states have the highest risk for earthquakes: Alaska, Hawaii, California, Oregon, Washington, Nevada, Utah, Idaho, Montana, Wyoming, Missouri, Arkansas, Tennessee, Illinois, Kentucky and South Carolina.

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