Earthquake Summary: During the month of April 2011, 91 earthquakes were located in the Yellowstone National Park region. The largest was a magnitude 2.2 event on April 13 at 7:11 AM MDT, located about 15 miles southeast of West Thumb, YNP. A small swarm of 24 earthquakes was recorded on April 14, located about 5 miles east of West Thumb, YNP, with magnitudes ranging from M 2.0 to M -0.1. For a map of recent earthquakes, please see:
http://www.seis.utah.edu/req2webdir/recenteqs/Maps/Yellowstone.html
Ground Deformation Summary: The period of caldera uplift that began in 2004 ended about one year ago. Since then, the caldera has been subsiding, though seasonal deformation from ground water changes may temporarily mask the trend. 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×eries=raw.
The Moon is Waning Gibbous (92% of Full)
Yellowstone Monthly Update issued May 2, 2011 14:58 MDT Volcano Alert Level NORMAL - Aviation Color Code GREEN
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