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Alert Level: NORMAL, Color Code: GREEN
2019-07-01 18:26:12 UTC





YELLOWSTONE VOLCANO OBSERVATORY MONTHLY UPDATE
U.S. Geological Survey
Monday, July 1, 2019, 12:26 PM MDT (Monday, July 1, 2019, 18:26 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

In June 2019, Steamboat geyser smashed more records! During the month, 7 water eruptions occurred, on June 1, 7, 12, 15, 19, 23, and 28, bringing the total number of eruptions for the year to 25. At this rate, the annual record for eruptions—32, set last year—will fall this summer! June also saw the shortest interval between eruptions that has ever been recorded—slightly over 3 days. University of Utah and National Park Service scientists deployed a network of 51 temporary seismometers around Steamboat geyser in mid-June and have already captured 4 water eruptions. These data will be a terrific complement to last year's May-June deployment and should teach scientists quite a lot about Steamboat's activity patterns and plumbing system! In addition to work at Steamboat, UNAVCO engineers visited Global Positioning System (GPS) stations around the park to conduct routine maintenance.

Seismicity

During June 2019, the University of Utah Seismograph Stations, responsible for the operation and analysis of the Yellowstone Seismic Network, located 73 earthquakes in the Yellowstone National Park region. The largest event was a microearthquake of magnitude 2.0 located 5 miles north of West Yellowstone, MT, on June 14 at 2:25 AM MDT. The earthquake was not reported felt.

Two small earthquake swarms were located 5 miles south-southeast of West Thumb in Yellowstone National Park. One occurred on June 13 and included 12 located earthquakes, while the other took place on June 19 and was made up of 10 located earthquakes. The largest earthquake in either sequence had a magnitude of 1.8 and occurred on June 19.

Yellowstone earthquake activity remains at background levels.

Ground deformation

There were no major 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 2-3 centimeters per year. Minor fluctuations in subsidence rate are most likely due to seasonal changes in snow melt and lake level. In the area of Norris Geyser Basin, GPS data show little 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
Saturday, June 1, 2019, 12:19 PM MDT (Saturday, June 1, 2019, 18:19 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

In May 2019, Steamboat geyser returned to its pattern of more frequent activity, with water eruptions occurring almost weekly, on May 3, 8, 13, 20, and 27. Field work by YVO scientists during the month involved the deployment of semipermanent GPS stations to 15 locations around Yellowstone National Park, as well as maintenance of the Norris temperature network—including the datalogger at Steamboat geyser, which had not been operating due to an equipment failure.

Seismicity

During May 2019, the University of Utah Seismograph Stations, responsible for the operation and analysis of the Yellowstone Seismic Network, located 77 earthquakes in the Yellowstone National Park region. The largest event was a microearthquake of magnitude 2.8 located 17 miles west-northwest of West Yellowstone, MT, on May 6 at 7:04 PM MDT. The earthquake was not reported felt.

Yellowstone earthquake activity remains at background levels.

Ground deformation

There were no major 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 2-3 centimeters per year. In the area of Norris Geyser Basin, GPS data show little net deformation 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