USGS Volcano Hazards Program Volcano Update


YVO update page and observatory web site


Updated January 3 from original update of January 1: During the month of December 2012, the University of Utah reports 101 earthquakes were located in the Yellowstone National Park region with a notable increase of earthquake swarms. The largest earthquake was a magnitude 2.6 event on December 15, 2012, at 6:25 AM MST, located about 10 miles north of Pahaska Teepee, WY. Dec. 9 through Dec. 10 a small swarm of 11 events was located 9 miles north northwest of West Yellowstone, MT with magnitudes 0.3 to 2.1. On Dec. 13 a small swarm of 12 quakes was recorded about 13 miles east of Old Faithful, YNP with magnitudes 0.3 to 2.1. Also on Dec. 13 a small swarm of 12 quakes was recorded between Lewis and Shoshone Lakes with magnitudes 1.4 to 2.5. Overall Yellowstone earthquake rates are normal for this monthly reporting period.

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://pbo.unavco.org/station/overview/WLWY

Update in Common Alerting Protocol (CAP) format