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Alert Level: NORMAL, Color Code: GREEN
2019-03-01 19:06:05 UTC





YELLOWSTONE VOLCANO OBSERVATORY MONTHLY UPDATE
U.S. Geological Survey
Friday, March 1, 2019, 12:06 PM MST (Friday, March 1, 2019, 19:06 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

Yellowstone National Park turns 147 today! The Park was founded when President Ulysses Grant signed the bill that created the nation's first national park on March 1, 1872. Happy Birthday Yellowstone!

There were four water eruptions of Steamboat geyser in February 2019, on February 1, 8, 16, and 26. Discharge measured at the Tantalus stream gage suggests that these eruptions may have been smaller than past events of the current sequence (which started in March 2018), although it is difficult to confirm this without direct observations.

YVO scientists are looking forward to spring, when field operations will start in earnest in the park. Some of the first planned work includes the installation of semi-permanent GPS stations in May (a project that has occurred each year since 2008), and technicians are currently preparing that equipment for deployment.

Seismicity

During February 2019, the University of Utah Seismograph Stations, responsible for the operation and analysis of the Yellowstone Seismic Network, located 81 earthquakes in the Yellowstone National Park region. The largest event was a minor earthquake of magnitude 3.1 located 14 miles south of West Yellowstone, MT, on February 16 at 02:22 PM MST. The earthquake was reported felt in Yellowstone National Park.

February seismicity in Yellowstone included a swarm of 17 located earthquakes on February 20. The swarm events ranged in magnitude from 0.1 to 1.7 and were located 5 miles north of West Yellowstone, MT.

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

Yellowstone earthquake activity remains at background levels.

Ground deformation

There were no significant changes in surface deformation in the Yellowstone area as recorded by GPS stations. Ground subsidence of Yellowstone caldera continues, as it has since 2015, at a rate of a few millimeters per month. In the area of Norris Geyser Basin, GPS data indicate no vertical deformation (the area has shown little net change since October 2018).

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, 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




YELLOWSTONE VOLCANO OBSERVATORY MONTHLY UPDATE
U.S. Geological Survey
Friday, February 1, 2019, 1:36 PM MST (Friday, February 1, 2019, 20:36 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

Steamboat geyser remains active in 2019, with three eruptions during the month—January 4, 16, and 25, the latter being one of the smallest (based on seismicity at station YNM and water discharge measured at the Tantalus stream gage) since the current sequence of water eruptions begain in March 2018. Yellowstone National Park scientists visited Norris Geyser Basin on January 30 and were able to restart the Norris temperature network (which had been off line since December 20). Stored data were downloaded, and new data are coming in from all stations (except, unfortunately, Steamboat, which has been offline due to a faulty datalogger since November 2018).

We're very happy to be back after the partial shutdown of the federal government! New editions of Yellowstone Caldera Chornicles are being posted each Monday to https://volcanoes.usgs.gov/volcanoes/yellowstone/article_home.html.

Seismicity

During January 2019, the University of Utah Seismograph Stations, responsible for the operation and analysis of the Yellowstone Seismic Network, located 84 earthquakes in the Yellowstone National Park region. The largest event was a minor earthquake of magnitude 3.0 located 5 miles south-southwest of West Thumb (in Yellowstone National Park) on January 23 at 03:05 AM MST.

January seismicity in Yellowstone included a swarm of 12 located earthquakes during January 22–23. The swarm events ranged in magnitude from 0.1 to 1.3 and were located 8 miles north of West Yellowstone, MT.

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

Yellowstone earthquake activity remains at background levels.

Ground deformation

There were no significant changes in surface deformation in the Yellowstone area as recorded by GPS stations. Ground subsidence of Yellowstone caldera continues, as it has since 2015, at a rate of a few millimeters per month. In the area of Norris Geyser Basin, GPS data indicate no vertical deformation (the area has shown little net change since September 2018).

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, 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