YELLOWSTONE VOLCANO OBSERVATORY MONTHLY UPDATEWednesday, February 1, 2012 12:59 PM MST (Wednesday, February 1, 2012 19:59 UTC)

YELLOWSTONE VOLCANO (CAVW #1205-01-)
44°25'48" N 110°40'12" W, Summit Elevation 9203 ft (2805 m)
Current Volcano Alert Level: NORMAL
Current Aviation Color Code: GREEN

During January 2012, 26 earthquakes were located in the Yellowstone National Park region. The largest was a magnitude 2.5 event on January 18 at 2:32 AM MST, located about 7 miles north northeast of West Yellowstone, MT.

Yellowstone earthquake activity continues at relatively low background levels and no swarms were detected.

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 Yellowstone Volcano Observatory (YVO) is a partnership of the U.S. Geological Survey (USGS), Yellowstone National Park, and University of Utah to strengthen the long-term monitoring of volcanic and earthquake unrest in the Yellowstone National Park region. Yellowstone is the site of the largest and most diverse collection of natural thermal features in the world and the first National Park. YVO is one of the five USGS Volcano Observatories that monitor volcanoes within the United States for science and public safety.

CONTACT INFORMATION:
Jacob Lowenstern, USGS
Scientist-in-Charge, Yellowstone Volcano Observatory
jlwnstrn@usgs.gov

Robert Smith, University of Utah
Coordinating Scientist, YVO

Henry Heasler, Yellowstone National Park
Coordinating Scientist, YVO