US5hz250 1:5M poly
type: Dataset
description: 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/
issued: 2018-03-14T12:58:22+00:00
modified: 2018-05-23T11:43:35+00:00
publisher: GeoPlatform ArcGIS Online
keyword: 0.2-second
keyword: 5Hz
keyword: earthquake
keyword: hazard
keyword: seismic
landing page: https://prep-response-portal.napsgfoundation.org/datasets/geoplatform::us5hz250-15m-poly-10

ArcGIS Hub Dataset
type: Distribution
format: HTML
issued: 2025-09-19T01:29:41.273399
modified: 2025-09-19T01:29:41.266506
access URL: https://prep-response-portal.napsgfoundation.org/datasets/geoplatform::us5hz250-15m-poly-10

OGC WMS
type: Distribution
format: OGC WMS
issued: 2025-09-19T01:29:41.273403
modified: 2025-09-19T01:29:41.266698
access URL: https://earthquake.usgs.gov/arcgis/services/haz/US5hz250_2014/MapServer/WMSServer

ArcGIS GeoService
type: Distribution
format: ArcGIS GeoServices REST API
issued: 2025-09-19T01:29:41.273402
modified: 2025-09-19T01:29:41.266614
access URL: https://earthquake.usgs.gov/arcgis/rest/services/haz/US5hz250_2014/MapServer/76

GeoJSON
type: Distribution
format: GeoJSON
issued: 2025-09-19T01:29:41.273407
modified: 2025-09-19T01:29:41.266931
access URL: https://prep-response-portal.napsgfoundation.org/api/download/v1/items/be9a9b9cd0b340e9a919e30c3b3e4ff9/geojson

Shapefile
type: Distribution
format: ZIP
issued: 2025-09-19T01:29:41.273406
modified: 2025-09-19T01:29:41.266855
access URL: https://prep-response-portal.napsgfoundation.org/api/download/v1/items/be9a9b9cd0b340e9a919e30c3b3e4ff9/shapefile

KML
type: Distribution
format: KML
issued: 2025-09-19T01:29:41.273408
modified: 2025-09-19T01:29:41.267006
access URL: https://prep-response-portal.napsgfoundation.org/api/download/v1/items/be9a9b9cd0b340e9a919e30c3b3e4ff9/kml

CSV
type: Distribution
format: CSV
issued: 2025-09-19T01:29:41.273404
modified: 2025-09-19T01:29:41.266776
access URL: https://prep-response-portal.napsgfoundation.org/api/download/v1/items/be9a9b9cd0b340e9a919e30c3b3e4ff9/csv