Hazard Notification System (HANS) for Volcanoes


U.S. Geological Survey
Wednesday, May 11, 2022, 9:11 AM MDT (Wednesday, May 11, 2022, 15:11 UTC)

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

The University of Utah, a YVO member agency, sent out the following press release about a magnitude 4.2 earthquake on the east side of Yellowstone National Park at 7:32 AM MDT.


University of Utah Seismograph Stations

Released: May 11, 2022 08:35 AM MDT

The University of Utah Seismograph Stations reports that a light earthquake of magnitude 4.2 occurred at 07:32 AM on May 11, 2022 (MDT).  The epicenter of the shock was located 23 mi NE of the East Entrance of Yellowstone National Park.  A total of 5 earthquakes of magnitude 3.0 or greater have occurred within 16 mi of the epicenter of this event since 1962.  The largest of these events was a magnitude 4.2 on March 25, 2008, 20 mi NE of Fishing Bridge, WY.

Anyone who felt the earthquake is encouraged to fill out a survey form on the US Geological Survey website for this event: https://earthquake.usgs.gov/earthquakes/eventpage/uu60497322/executive


As of 9 AM MDT, 15 felt reports had been submitted for the earthquake, with shaking described as "light" to "weak."  Earthquakes like this are common in the Yellowstone region, where over 30 earthquakes of M4 or greater have occurred since 1973.  Today’s earthquake, which took place at a depth of 14 km (8.7 miles), is the largest to occur in Yellowstone National Park since a M4.5 event on June 15, 2017 (part of a long-lived swarm of small earthquakes in the area between Hebgen Lake and Norris Geyser Basin, northeast of West Yellowstone, MT).

The Yellowstone Volcano Observatory (YVO) provides long-term monitoring of volcanic and earthquake activity 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.

YVO Member agencies: USGS, Yellowstone National Park, University of Utah, University of Wyoming, Montana State University, UNAVCO, Inc., Wyoming State Geological Survey, Montana Bureau of Mines and Geology, Idaho Geological Survey


Michael Poland, Scientist-in-Charge