The University of Utah Seismograph Stations reports that a period of increased seismic activity occurred on February 2, 2010 beginning at ~3:30 PM MST. This period of increased activity lasted about six hours and included at least two events that were reported felt in Yellowstone National Park. The two largest earthquakes during this sequence were magnitude 3.1 and 2.8 that occurred at 7:31 PM and 7:44 PM respectively.
Since then there’s been no activity at all: no earthquakes were recorded on Feb. 3 and the morning of Feb. 4, through 6 a.m. This parallels the slowdown in seismic activity around the globe; in addition to the Yellowstone swarm, tectonic shifts were thought to be responsible for the Haitian earthquakes as well as earthquakes around the globe, including an earthquake in Oklahoma that was more severe than any earthquake reported in Yellowstone. Monitoring equipment shows no changes or activity in the Yellowstone supervolcano caldera.
Fourteen of the earthquakes have been magnitude 3.0 or greater. The larger quakes have been felt by people in Old Faithful, West Yellowstone, Canyon, Mammoth Hot Springs, Grant Village, Madison, and Gardiner. No damage or injuries have been reported.
Almost 80 swarms have been recorded in Yellowstone since 1995.
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