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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.\n\nFor more information online visit:\nhttp://pubs.usgs.gov/sim/3195/,\nhttp://pubs.usgs.gov/of/2008/1128/, and \nhttp://earthquake.usgs.gov/hazards/", "mapName": "US_1Hz_10PercentIn50Years", "description": "", "copyrightText": "US Geological Survey National Seismic Hazard Mapping Program", "supportsDynamicLayers": false, "layers": [ { "id": 0, "name": "1:1,128 (L1)", "parentLayerId": -1, "defaultVisibility": true, "subLayerIds": [ 1, 2, 3, 4, 5, 6 ], "minScale": 1691, "maxScale": 0, "type": "Group Layer", "supportsDynamicLegends": false }, { "id": 1, "name": "US1hz050 1:5M arc", "parentLayerId": 0, "defaultVisibility": true, "subLayerIds": null, "minScale": 0, "maxScale": 0, "type": "Feature Layer", "geometryType": "esriGeometryPolyline", 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This particular data set is for horizontal spectral response acceleration for 1.0-second period with a 10 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. 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