A magnitude 5.9 earthquake off North Korea early Thursday jolted watchers of the country's weapons development but experts say it was not caused by a nuclear test.
A 6.8-magnitude earthquake reportedly hit the Pacific Ocean about 10 miles from Santa Barbara, Calif., the U.S. Geological Survey alert stated - in error.
A magnitude 5.0 earthquake centered near one of the world's key oil hubs brought down building facades and shattered windows in a central Oklahoma city.
A pandemic influenza; a chemical spill; a terror attack; an earthquake, wildfire or hurricane. Each is a catastrophe that hospitals are preparing for now.