Volcano Updates

Alert Level: NORMAL, Color Code: GREEN 2021-03-01 17:21:27

YELLOWSTONE VOLCANO OBSERVATORY MONTHLY UPDATE
U.S. Geological Survey
Monday, March 1, 2021, 10:21 AM MST (Monday, March 1, 2021, 17:21 UTC)


YELLOWSTONE VOLCANO (VNUM #325010)
44°25'48" N 110°40'12" W, Summit Elevation 9203 ft (2805 m)
Current Volcano Alert Level: NORMAL
Current Aviation Color Code: GREEN

Recent work and news

As was the case in January, Steamboat Geyser had two major water eruptions in the past month, on February 3 and 21. This is typical of winter, when low groundwater levels seem to correlate with longer intervals between Steamboat eruptions.

Seismicity

During February 2021, the University of Utah Seismograph Stations, responsible for the operation and analysis of the Yellowstone Seismic Network, located 67 earthquakes in the Yellowstone National Park region. The largest event was a minor earthquake of magnitude 2.4 located 13 miles north of Pahaska Tepee, WY, on February 2 at 3:08 AM MST.

A swarm of 20 earthquakes, with magnitudes between 0.3 and 2.3, was recorded in the area of West Yellowstone, MT, during February 1–16. The largest event of the swarm occurred on February 4 at 05:30 AM (MST) and was located one mile southwest of West Yellowstone.

Earthquake sequences like these are common and account for roughly 50% of the total seismicity in the Yellowstone region.

Yellowstone earthquake activity remains at background levels.

Ground deformation

Deformation rates and styles at Yellowstone, as recorded by continuous GPS stations, have been steady over the past year. Subsidence of Yellowstone Caldera, which has been ongoing since 2015, continued at an average rate of 2-3 cm (about 1 in) per year. In the area of Norris Geyser Basin, no significant uplift or subsidence has been detected by a nearby GPS station since the start of 2020.

An example of GPS data can be found at http://www.unavco.org/instrumentation/networks/status/pbo/data/NRWY (click on Static Plots / Cleaned)



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



CONTACT INFORMATION:

Michael Poland, Scientist-in-Charge
mpoland@usgs.gov