During the month of December 2010, 80 earthquakes were located in the Yellowstone National Park region. The largest was a magnitude 2.3 event on December 27 at 11:36 PM MST, located about 22 miles east southeast of West Thumb, YNP. This earthquake was part of a small earthquake swarm that occurred December 27 - 28. The swarm consisted of 12 events with magnitudes 2.3 to 0.4.
Earthquake activity continues at background levels.
Ground Deformation Summary: Careful analysis of the Yellowstone GPS data shows that the period of accelerated Yellowstone caldera uplift, beginning in 2004, has decreased. Some GPS stations exhibit little change and others appear to reflect slight subsidence. A record of recent ground displacement can be found at: http://pboweb.unavco.org/shared/scripts/stations/?checkkey=WLWY&sec=timeseries_plots×eries=raw