Below are some useful links :

Government Agencies

• Centers For Disease Control
  http://www.bt.cdc.gov
• Federal Emergency Management Agency
  http://www.fema.gov
• National Oceanic and Atmospheric Administration
  http://www.noaa.gov
• United States Geological Survey
  http://www.usgs.gov
• California Governor's Office of Emergency Services
  http://www.oes.ca.gov
• American Red Cross
  http://www.redcross.org
  

Research Centers

• Disaster Research Center at University of Delaware
  http://www.udel.edu/DRC
• Natural Hazards Center at University of Colorado
  http://www.colorado.edu/hazards
• Earthquake Engineering Research Institute
  http://www.eeri.org
• National Terrorism Preparedness Institute at St. Petersburg College
  http://terrorism.spjc.edu
• National Institute for Urban Search & Rescue
  http://www.niusr.org

Natural Hazards

• National Hurricane Center
  http://www.nhc.noaa.gov
• Volcano Center
  http://vulcan.wr.usgs.gov
• National Earthquake Information Center
  http://wwwneic.cr.usgs.gov/

Business Continuity

• Disaster Recovery Institute
  http://www.dr.org/ppcont.htm
• Contingency Planning and Disaster Recovery
  http://www.disasterplan.com
• Business Continuity Planners Online Resource
  http://www.continuityplanner.com
  

Risk Management

• RiskInfo
  http://www.riskinfo.com
• Risk Management Resource Center
  http://www.eriskcenter.org
• Public Entity Risk Institute
  http://www.riskinstitute.org

Associations

• International Association of Emergency Managers
  http://www.iaem.com
• Business Recovery Managers Association
  http://www.brma.com
• National Association of Emergency Managers
  http://www.nemaweb.org