TSUNAMIS
  
                      US Tsunami Warning System
                      
VOLCANOS

                      USGS Volcano Hazards Program - Volcanoes and Current Activity Alerts

Any volcano has the capability to destroy surrounding life.  Volcanoes in the "super volcano" category have the capability to destroy global food production in a short time.  One such volcano is the supervolcano in Yellowstone National mark in the northwest corner of Wyoming