US5hz250_2014

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 horizontal spectral response acceleration for 0.2-second period 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/

Data and Resources

Field Value
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metadata_source arcgis
metadata_type geospatial
old-spatial {"type": "Polygon", "coordinates": [[[-125, 24], [-125, 50], [-65, 50], [-65, 24], [-125, 24]]]}
spatial {"type": "Polygon", "coordinates": [[[-125, 24], [-125, 50], [-65, 50], [-65, 24], [-125, 24]]]}
Groups
  • AmeriGEOSS
  • National Provider
  • North America
Tags
  • 02-second
  • 5hz
  • amerigeo
  • amerigeoss
  • ckan
  • earthquake
  • geo
  • geoss
  • hazard
  • national
  • north-america
  • seismic
  • united-states
isopen False
metadata_created 2025-11-21T08:52:44.426930
metadata_modified 2025-11-21T08:52:44.426934
notes 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 horizontal spectral response acceleration for 0.2-second period 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/
num_resources 2
num_tags 13
title US5hz250_2014