- Current Update, last updated Dec 1, 2014 14:56 :
During November 2014, the University of Utah Seismograph Stations, responsible for the operation and analysis of the Yellowstone Seismic Network, reports 119 earthquakes were located in the Yellowstone National Park region. The largest event was a small earthquake of magnitude 2.3 on November 26, at 12:09 AM MST, located about 34 miles southwest of Grant Village in Yellowstone National Park, Wyoming.
November 2014 seismicity is characterized by four separate small earthquake swarms .
1) A small series of 26 earthquakes occurred in the Norris Geyser Basin area, throughout November with the majority of earthquakes occurring on November 25th. The largest earthquake (magnitude 2.0) occurred November 21, at 09:37 PM MST, located 13 miles west-northwest of Lake, WY.
2) A small series of 16 earthquakes occurred November 4th and 5th MST. The largest earthquake (magnitude 1.7) occurred November 4, 09:59 PM MST, 8 miles west of Old Faithful, WY.
3) A small series of 14 earthquakes began November 27. The largest earthquake in the series (magnitude 1.9) occurred on November 27, at 04:15 PM MST, located 5 miles south from Lake, WY.
4) A small series of 12 earthquakes occurred over November 27th and 28th. The largest earthquake (magnitude 2.0) occurred November 27, at 02:33 PM MST, nine miles north-northwest of Old Faithful, WY.
Earthquake sequences like these are common and account for roughly 50% of the total seismicity in the Yellowstone region.
Yellowstone earthquake activity in November is at background levels.
Deformation in north-central Yellowstone is decreasing. Subsidence at the NRWY GPS station has slowed to a rate of < 2 cm/yr.
Caldera GPS stations continue to record the pattern of uplift that has persisted since the beginning of 2014. An example can be found at:
http://www.unavco.org/instrumentation/networks/status/pbo/data/HVWY (click on Static Plots / Time Series)
- Volcanic History Overview: The Yellowstone Plateau volcanic field developed through three volcanic cycles spanning two million years that included some of the world's largest known eruptions. Eruption of the >2450 cu km Huckleberry Ridge Tuff about 2.1 million years ago created the more than 75-km-long Island Park caldera. The second cycle concluded with the eruption of the Mesa Falls Tuff around 1.3 million years ago, forming the 16-km-wide Henrys Fork caldera at the western end of the first caldera. Activity subsequently shifted to the present Yellowstone Plateau and culminated 640,000 years ago with the eruption of the >1000 cu km Lava Creek Tuff and the formation of the present 45 x 85 km caldera. Resurgent doming subsequently occurred at both the NE and SW sides of the caldera and voluminous (1000 cu km) intracaldera rhyolitic lava flows were erupted between 150,000 and 70,000 years ago. No magmatic eruptions have occurred since the late Pleistocene, but large phreatic eruptions took place near Yellowstone Lake during the Holocene. Yellowstone is presently the site of one of the world's largest hydrothermal systems including Earth's largest concentration of geysers.
- Location: Western US, WY
Elevation: 2805 m
- Hazard Assessments: Christiansen, R. L., Lowenstern, J. B., Smith, R. B., Heasler, H, Morgan, L. A., Nathenson, M., Mastin, L. G., Muffler, L. J. P., and Robinson, J. E., 2007, Preliminary Assessment of Volcanic and Hydrothermal Hazards in Yellowstone National Park and Vicinity, U.S. Geological Survey Open-File Report 2007-1071.
- Link to monitoring data:
Recent earthquake activity in Yellowstone National Park (map and catalog with links)
GPS Measured Horizontal Ground Motions
Provisional real-time stream-flow data
See the Yellowstone Volcano Observatory Monitoring Page for more.
Volcanic Alert Level: NORMAL Aviation Color Code: GREEN