Federal Emergency Management Association
    http://www.fema.gov/

Centers for Disease Control and Prevention
    http://www.cdc.gov/

Ready America
   http://www.ready.gov/

Specific Event Information:

Flood Smart
    http://www.floodmart.gov

Earthquake
    http://www.72hours.org/

Tornado
    http://www.bt.cdc.gov/disasters/tornadoes/

Hurricane
    http://www.fema.gov/hazard/hurricane/index.shtm

Flood
    http://www.bt.cdc.gov/disasters/floods/

Avian and Pandemic Influenza
   http://www.state.gov/g/avianflu/91242.htm

USGS
  http://astrogeology.usgs.gov/Projects/BrowseTheSolarSystem/earth.html