Avalanche:

http://www.avalanche.org/

Colorado:

http://www.colorado.edu/hazards

Dartmouth Flood Observatory:

http://www.dartmouth.edu/artsci/geog/floods

Earthquake Engineering Research:

http://www.eerc.berkeley.edu/

EPIX Home Page:

http://hoshi.cic.sfu.ca/epix/

The Natural Hazards Center - Info. on Human Adaptation to Disaster:

http://www.colorado.edu/hazards/

National Hurricane Center:

http://www.nhc.noaa.gov/

http://utvols.8m.com/

Tsunami:

http://tsunami.ce.washington.edu

UM Weather:

http://cirrus.sprl.umich.edu/wxnet/

US Geological Surveys:

http://info.er.usgs.gov/

USGS-National Seismic Hazard Mapping:

http://geohazards.cr.usgs.gov/eqint/html/zipcode.shtml

Volcano Observatory:

http://vulcan.wr.usgs.gov/home.html