Newest Volcano Notice Including Yellowstone

Summary

Yellowstone Caldera activity remains at background levels, with 61 located earthquakes in March (largest = M1.9). Deformation measurements indicate a pause in the uplift that had been occurring along the north caldera rim since July 2025.

Recent Work and News

Echinus Geyser, in Norris Geyser Basin, reawakened from a several-year slumber in February, with about 40 eruptions that month, but the geyser had only one eruption in March.  An eruption was detected by acoustic, seismic, and temperature measurements at Black Diamond Pool in Biscuit Basin (site of a hydrothermal explosion in 2024) on March 9 at 1:27 a.m. MDT.

Seismicity

During March 2026, the University of Utah Seismograph Stations, responsible for the operation and analysis of the Yellowstone Seismic Network, located 61 earthquakes in the Yellowstone National Park region. The largest event of the month was a microearthquake of magnitude 1.9 located about 5 miles north of West Yellowstone, Montana, on March 15 at 5:14 a.m. MDT.

March seismicity in Yellowstone was marked by a swarm of 10 earthquakes that occurred approximately 5 miles north of West Yellowstone, Montana, on March 15. The largest earthquake in the sequence was also the largest in March (described above).

Earthquake activity in Yellowstone is at background levels.

Ground Deformation

Continuous GPS stations indicate that the uplift that started in July 2025 on the north caldera rim ceased by mid-January 2026.  In Yellowstone Caldera, continuous GPS data recorded little net change since December, although results are ambiguous due to the impacts of winter weather conditions on GPS data.

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