Volcano Update from Archive

Tuesday, January 19, 2010 3:41 PM MST (Tuesday, January 19, 2010 2241 UTC)

Yellowstone Volcano
44°25'48" N 110°40'12" W, Summit Elevation 9203 ft (2805 m)
Current Volcano Alert Level: NORMAL
Current Aviation Color Code: GREEN

Earthquake swarm on the northwest edge of Yellowstone Caldera continues.


Released: January 19, 2010 03:00 PM MST

The University of Utah Seismograph Stations reports an update of information on an ongoing earthquake swarm in Yellowstone National Park that began January 17, 2010 (1:00 PM MST). The swarm is located about 10 miles northwest of Old Faithful, WY and 9 miles southeast of West Yellowstone, MT. The largest earthquake in the swarm as of 3 PM, January 19, 2010, was a magnitude 3.7 event that occurred at 2:31 PM, MST, January 19, 2010. and there have been 469 located earthquakes in the swarm of magnitudes 0.5 to 3.7. This includes 5 events of magnitude larger than 3, with 34 events of magnitude 2 to 3, and 430 events of magnitude less than 2. There have been multiple personal reports of ground shaking from observations inside Yellowstone National Park and in neighboring communities in Montana and Idaho for some of the larger events. Earthquake swarms of this nature are relatively common in Yellowstone National Park.

At this time the Yellowstone Volcano Observatory does not consider the swarm to be unusual and the earthquakes are likely related to tectonic fault sources. Also there is no indication of premonitory volcanic or hydrothermal activity, but ongoing analyses will evaluate these different sources.

Information on the earthquake can be viewed at the University of Utah Seismograph Stations: http://www.seis.utah.edu/.

Seismograph recordings from stations of the Yellowstone seismograph station can be viewed online at: http://quake.utah.edu/helicorder/yell_webi.htm.

Anyone who has felt earthquakes in the swarm are encouraged to fill out a form on the USGS Community Felt reports web site: http://earthquake.usgs.gov/eqcenter/dyfi/.

This press release was prepared by the Yellowstone Volcano Observatory partners of the U.S. Geol. Survey, the University of Utah, and the National Park Service: http://volcanoes.usgs.gov/yvo/

Peter Cervelli, Acting Scientist-in-Charge, USGS

pcervelli@usgs.gov (650) 329-5188