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This dataset contains watershed means of estimated percent impervious surfaces for three time periods: 1992, 2002, and 2012. Estimates are based on coefficients derived from comparing land use of the 2012 NAWQA Wall-to-wall Anthropogenic Land-use Trends (NWALT) product to the 2011 National Land Cover Database (NLCD) imperviousness, then applying those coefficients to previous years (1974-2002) of the NWALT dataset.
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The U. S. Geological Survey (USGS) makes long-term seismic hazard forecasts that are used in building codes. The hazard models usually consider only natural seismicity; non-tectonic (man-made) earthquakes are excluded because they are transitory or too small. In the past decade, however, thousands of earthquakes related to underground fluid injection have occurred in the central and eastern U.S. (CEUS), and some have caused damage. In response, the USGS is now also making short-term forecasts that account for the hazard from these induced earthquakes. A uniform earthquake catalog is assembled by combining and winnowing pre-existing source catalogs. Seismicity statistics are analyzed to develop recurrence models,...


map background search result map search result map Percent impervious surface for selected Chesapeake Bay watersheds USGS Topo Map Vector Data (Vector) 553 Aliquippa PA (published 20231221) Shapefile USGS Topo Map Vector Data (Vector) 2196 Bakersville PA (published 20231221) Shapefile USGS Topo Map Vector Data (Vector) 6305 Burnham PA (published 20231221) Shapefile USGS Topo Map Vector Data (Vector) 8882 Clarendon PA (published 20231221) Shapefile USGS Topo Map Vector Data (Vector) 9305 Clymer PA (published 20231221) Shapefile USGS Topo Map Vector Data (Vector) 9350 Coalport PA (published 20231221) Shapefile USGS Topo Map Vector Data (Vector) 17020 Geistown PA (published 20231221) Shapefile USGS Topo Map Vector Data (Vector) 17415 Glen Richey PA (published 20231221) Shapefile USGS Topo Map Vector Data (Vector) 22735 Johnstown PA (published 20231221) Shapefile USGS Topo Map Vector Data (Vector) 10564 Cranberry PA (published 20231221) Shapefile USGS Topo Map Vector Data (Vector) 11468 Dawson PA (published 20231221) Shapefile USGS Topo Map Vector Data (Vector) 12887 Du Bois PA (published 20231221) Shapefile USGS Topo Map Vector Data (Vector) 13169 Dutch Mountain PA (published 20231221) Shapefile USGS Topo Map Vector Data (Vector) 13677 Edinboro South PA (published 20231221) Shapefile USGS Topo Map Vector Data (Vector) 13882 Eldred PA (published 20231221) Shapefile USGS Topo Map Vector Data (Vector) 14149 Ellsworth PA (published 20231221) Shapefile USGS Topo Map Vector Data (Vector) 16682 Galeton PA (published 20231221) Shapefile USGS Topo Map Vector Data (Vector) 47320 Wallaceton PA (published 20231221) Shapefile USGS Topo Map Vector Data (Vector) 553 Aliquippa PA (published 20231221) Shapefile USGS Topo Map Vector Data (Vector) 2196 Bakersville PA (published 20231221) Shapefile USGS Topo Map Vector Data (Vector) 6305 Burnham PA (published 20231221) Shapefile USGS Topo Map Vector Data (Vector) 8882 Clarendon PA (published 20231221) Shapefile USGS Topo Map Vector Data (Vector) 9305 Clymer PA (published 20231221) Shapefile USGS Topo Map Vector Data (Vector) 9350 Coalport PA (published 20231221) Shapefile USGS Topo Map Vector Data (Vector) 17020 Geistown PA (published 20231221) Shapefile USGS Topo Map Vector Data (Vector) 17415 Glen Richey PA (published 20231221) Shapefile USGS Topo Map Vector Data (Vector) 22735 Johnstown PA (published 20231221) Shapefile USGS Topo Map Vector Data (Vector) 10564 Cranberry PA (published 20231221) Shapefile USGS Topo Map Vector Data (Vector) 11468 Dawson PA (published 20231221) Shapefile USGS Topo Map Vector Data (Vector) 12887 Du Bois PA (published 20231221) Shapefile USGS Topo Map Vector Data (Vector) 13169 Dutch Mountain PA (published 20231221) Shapefile USGS Topo Map Vector Data (Vector) 13677 Edinboro South PA (published 20231221) Shapefile USGS Topo Map Vector Data (Vector) 13882 Eldred PA (published 20231221) Shapefile USGS Topo Map Vector Data (Vector) 14149 Ellsworth PA (published 20231221) Shapefile USGS Topo Map Vector Data (Vector) 16682 Galeton PA (published 20231221) Shapefile USGS Topo Map Vector Data (Vector) 47320 Wallaceton PA (published 20231221) Shapefile Percent impervious surface for selected Chesapeake Bay watersheds