Plot of cumulative earthquakes at Yellowstone in Apr. of 2004.
By Volcano Hazards Program
2004 (approx.)
Detailed Description
The April 2004 swarm included about 400 events over the period of three days. On April 14th there were over 200 events. The red line shows the cumulative number of earthquakes over the one-month period.
Sources/Usage
Public Domain.