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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 mapped area boundary, flood inundation extents, and depth rasters were created to provide an estimated extent of flood inundation along the Greenbrier River within the community of Alderson, West Virginia. These geospatial data include the following items: 1. greenbrier_ald_bnd; shapefile containing the polygon showing the mapped area boundary for the Greenbrier River flood maps, 2. greenbrier_ald_hwm; shapefile containing high-water mark points, 3. polygon_greenbrier_ald_hwm; shapefile containing mapped extent of flood inundation, derived from the water-surface elevation surveyed at high-water marks, 4. depth_hwm; raster file for the flood depths derived from the water-surface elevation surveyed at high-water...
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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) 16894 Garretts Bend WV (published 20231222) Shapefile USGS Topo Map Vector Data (Vector) 16990 Gay WV (published 20231222) Shapefile USGS Topo Map Vector Data (Vector) 19979 Hedgesville WV (published 20231222) Shapefile USGS Topo Map Vector Data (Vector) 21529 Huntington WV (published 20231222) Shapefile USGS Topo Map Vector Data (Vector) 27393 Man WV (published 20231222) Shapefile USGS Topo Map Vector Data (Vector) 29959 Montgomery WV (published 20231222) Shapefile USGS Topo Map Vector Data (Vector) 41000 Shepherdstown WV (published 20231222) Shapefile USGS Topo Map Vector Data (Vector) 43413 Strange Creek WV (published 20231222) Shapefile USGS Topo Map Vector Data (Vector) 7922 Center Point WV (published 20231222) Shapefile USGS Topo Map Vector Data (Vector) 30235 Morgantown North WV (published 20231222) Shapefile USGS Topo Map Vector Data (Vector) 32902 Odd WV (published 20231222) Shapefile USGS Topo Map Vector Data (Vector) 34710 Peniel WV (published 20231222) Shapefile USGS Topo Map Vector Data (Vector) 37991 Ripley WV (published 20231222) Shapefile USGS Topo Map Vector Data (Vector) 40802 Sharp Knob WV (published 20231222) Shapefile USGS Topo Map Vector Data (Vector) 41582 Skelt WV (published 20231222) Shapefile USGS Topo Map Vector Data (Vector) 41816 Smithville WV (published 20231222) Shapefile USGS Topo Map Vector Data (Vector) 44095 Sylvester WV (published 20231222) Shapefile Greenbrier River at Alderson, West Virginia, Flood Map Files from June 2016 USGS Topo Map Vector Data (Vector) 16894 Garretts Bend WV (published 20231222) Shapefile USGS Topo Map Vector Data (Vector) 16990 Gay WV (published 20231222) Shapefile USGS Topo Map Vector Data (Vector) 19979 Hedgesville WV (published 20231222) Shapefile USGS Topo Map Vector Data (Vector) 21529 Huntington WV (published 20231222) Shapefile USGS Topo Map Vector Data (Vector) 27393 Man WV (published 20231222) Shapefile USGS Topo Map Vector Data (Vector) 29959 Montgomery WV (published 20231222) Shapefile USGS Topo Map Vector Data (Vector) 41000 Shepherdstown WV (published 20231222) Shapefile USGS Topo Map Vector Data (Vector) 43413 Strange Creek WV (published 20231222) Shapefile USGS Topo Map Vector Data (Vector) 7922 Center Point WV (published 20231222) Shapefile USGS Topo Map Vector Data (Vector) 30235 Morgantown North WV (published 20231222) Shapefile USGS Topo Map Vector Data (Vector) 32902 Odd WV (published 20231222) Shapefile USGS Topo Map Vector Data (Vector) 34710 Peniel WV (published 20231222) Shapefile USGS Topo Map Vector Data (Vector) 37991 Ripley WV (published 20231222) Shapefile USGS Topo Map Vector Data (Vector) 40802 Sharp Knob WV (published 20231222) Shapefile USGS Topo Map Vector Data (Vector) 41582 Skelt WV (published 20231222) Shapefile USGS Topo Map Vector Data (Vector) 41816 Smithville WV (published 20231222) Shapefile USGS Topo Map Vector Data (Vector) 44095 Sylvester WV (published 20231222) Shapefile Percent impervious surface for selected Chesapeake Bay watersheds