During the month of December 2011 (through 5:00 PM MST December 29) 68 earthquakes were located in the Yellowstone National Park region. The largest was a magnitude 2.5 event on December 27 at 10:40 PM MST, located about 9 miles north of Tower Junction, YNP. A small swarm of 18 quakes located 5 miles north of West Thumb, YNP was recorded on December 8 with magnitudes from 0.3 - 1.6.
Yellowstone earthquake activity continues at normal background levels.
Slow subsidence of the caldera, which began in early 2010, continues. Current deformation patterns at Yellowstone are well within historical norms.
Please see: http://www.uusatrg.utah.edu/ts_ysrp.html for a map of GPS stations in the Yellowstone vicinity. For a graph of daily GPS positions at White Lake, within the Yellowstone caldera, please see: http://pboweb.unavco.org/shared/scripts/stations/?checkkey=WLWY&sec=timeseries_plots
The Moon is Waxing Gibbous (84% of Full)
Yellowstone Monthly Update issued Jan 1, 2012: Volcano Alert Level NORMAL - Aviation Color Code GREEN
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