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<CreaDate>20160601</CreaDate>
<CreaTime>18061300</CreaTime>
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<idAbs>Probabilistic seismic-hazard maps were prepared for the conterminous United States portraying peak horizontal acceleration and horizontal spectral response acceleration for 0.2- and 1.0-second periods with probabilities of exceedance of 10 percent in 50 years and 2 percent in 50 years.  This particular data set is for peak horizontal acceleration with a 2 percent probability of exceedance in 50 years.  All of the maps were prepared by combining the hazard derived from spatially smoothed historic seismicity with the hazard from fault-specific sources.  The acceleration values contoured are the random horizontal component.  The reference site condition is firm rock, defined as having an average shear-wave velocity of 760 m/sec in the top 30 meters corresponding to the boundary between NEHRP (National Earthquake Hazards Reduction program) site classes B and C.

For more information online visit:
http://pubs.usgs.gov/sim/3195/,
http://pubs.usgs.gov/of/2008/1128/, and 
http://earthquake.usgs.gov/hazards/</idAbs>
<searchKeys>





      
      
      
    <keyword>earthquake</keyword>
      <keyword>hazard</keyword>
      <keyword>pga</keyword>
      <keyword>seismic</keyword>
    </searchKeys>
<idPurp>Peak Horizontal Acceleration with 2% Probability of Exceedance in 50 Years (2014)</idPurp>
<idCredit>US Geological Survey National Seismic Hazard Mapping Program</idCredit>
<resConst>
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<idCitation>
<resTitle>US pga 2% in 50 years</resTitle>
</idCitation>
</dataIdInfo>
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