Risk of earthquake increased for about half of US

SETH BORENSTEIN, AP Science Writer
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This undated handout image provided by the US Geological Survey (USGS) shows an updated federal earthquake risk map. (AP Photo/USGS)

This undated handout image provided by the US Geological Survey (USGS) shows an updated federal earthquake risk map. (AP Photo/USGS)

WASHINGTON (AP) — A new federal earthquake map dials up the shaking hazard just a bit for about half of the United States and lowers it for nearly a quarter of the nation.

The U.S. Geologic 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.

FILE - This Aug. 23, 2011 file photo shows office workers gathering on the sidewalk in downtown Washington after a 5.9 magnitude tremor shook the nation's capitol. The earthquake centered northwest of Richmond, Va., shook much of Washington, D.C., and was felt as far north as Rhode Island and New York City. (AP Photo/J. Scott Applewhite, File)

FILE – This Aug. 23, 2011 file photo shows office workers gathering on the sidewalk in downtown Washington after a 5.9 magnitude tremor shook the nation’s capitol. The earthquake centered northwest of Richmond, Va., shook much of Washington, D.C., and was felt as far north as Rhode Island and New York City. (AP Photo/J. Scott Applewhite, File)

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.

This undated handout image provided by the US Geological Survey (USGS) shows where the earthquake hazard increased and decreased from 2008. Red/brown increased. Blue decreased. (AP Photo/USGS)

This undated handout image provided by the US Geological Survey (USGS) shows where the earthquake hazard increased and decreased from 2008. Red/brown increased. Blue decreased. (AP Photo/USGS)

Copyright 2014 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.

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