Links to natural hazards related GIS data
NOAA NGDC Natural Hazards Data -NOAA Satellite and Information Service National Geophysical Data Center. Natural hazard maps and GIS data center.
National Atlas - Various spatial layers including natural hazards.
SEDAC Hazards Data and Maps -Socioeconomic Data and Applications Center (SEDAC) Global Natural Hazards GIS data.
USGS Water Resources:Maps/GIS Data - Downloadable spatial data files for exploration and analysis of water resources of the United States. Groundwater, surface water, water quality etc.
More to come...