Fact of the day
400 earthquakes in 3 days
During one seismic swarm at Yellowstone in 2004, instruments recorded about 400 earthquakes in three days. Most were too weak for people to feel.
Source: United States Geological Survey
ShelterShelterFact of the day
During one seismic swarm at Yellowstone in 2004, instruments recorded about 400 earthquakes in three days. Most were too weak for people to feel.
Source: United States Geological Survey