Images

Map of horizontal velocities between July and December 2025 at Global Positioning System (GPS) stations P711 and NRWY (arrows and yellow circles) in the area between Norris Geyser Basin and Madison Junction. Dashed red line indicates boundary of Yellowstone Caldera and gray lines are roads.

Plot of numbers of earthquakes per day in the immediate vicinity of the Norris Uplift Anomaly during 2024-2025.  An increase in the rate of seismicity occurred in September-December 2025, especially in November.  The largest earthquake during that time was M2.7.

Mike Stickney in front of one of the original seismograph drum recorders for the Montana Regional Seismic Network at the Montana Bureau of Mines and Geology Earthquake Studies Office. Today all earthquake data in Montana are recorded digitally from a large network of about 50 stations, including many telemetered broadband stations.

Changes in concentrations of hydrogen (H2), sulfide (HS-), and cells, and the accumulated seismic energy during May–November 2021, when microbial samples were collected from a borehole near West Thumb in Yellowstone National Park.

EarthScope field engineer Brendan Hodge waits in line to enter Yellowstone National Park via snowmobile at the West Entrance.  Photo by Lia Lajoie, EarthScope Consortium, winter 2025. 

Brendan Hodge, Field Engineer with EarthScope Consortium, cross-country skiing from the “oversnow” road to arrive at the Madison Junction GPS monitoring station (P711). All necessary tools and parts used for repairs and upgrades are carried on his back. Photo by Lia Lajoie, EarthScope Consortium, winter 2025.

Horses and mules carried batteries to the Slough Creek GPS station (P720) in their saddle bags. The GPS station itself is shown in the left foreground, including the box that houses the receiver and solar panel mounted up against it. Photo by Brendan Hodge, EarthScope Consortium, 2025.

Hot spring located along the trail to the Grand Prismatic Spring overlook shown before and after the Yellowstone National Park Geology Program team cleaned the feature of sticks and rocks that were thrown in by visitors.  National Park Service photos by Margery Price, July and September 2025,

Geological conditions in Yellowstone National Park during borehole microbiological study in 2021. Top panel (a) shows a map view of Yellowstone National Park, with different map colors representing water bodies and various rock types.

Plot showing total energy absorbed from earthquakes throughout the May to November 2021 sampling period of a microbial study in Yellowstone National Park. The five different sampling windows are distinguished by shading, and Julian Day is the number of the day within the year (so Julian Day 200, for example, was July 19, 2021).

Infographic showing the numbers, styles, colors, and other data regarding hats recovered from thermal areas by the Yellowstone National Park Geology Program in 2025.  Designed by Margery Price, Yellowstone National Park.

Map view of relocated Yellowstone seismicity recorded during 2008-2022, colored by time, on the left.  White line gives the outline of Yellowstone caldera. The A-A’ cross section through Yellowstone Lake is shown at the right and illustrates how seismic swarms that are distinct in time relate to one another.  Adapted from Florez and others, 2025 (

Interferogram created from satellite radar data collected on October 7, 2024, and October 2, 2025, over the Yellowstone region by the Sentinel-1 satellite system. Colored fringes indicate a change in distance (called range change) between the satellite and ground surface that is caused by surface deformation during the time spanned.

Map of seismic stations in the Yellowstone region, with numbers of channels indicated by number and sensor type by color.  Inverted triangles indicate stations operated by University of Utah Seismograph Stations (UUSS), and squares indicate stations operated by other agencies.

EarthScope engineers Brendan Hodge (left) and Lia Lajoie (right) perform upgrades at the WLWY (White Lake) continuous GPS station in Yellowstone National Park.  The white box contains the receiver, while the barrel on the ground contains batteries.  The tower holds the solar panels, as well as a cellular modem and meteorological sensors that were recently

Just some of the hats collected by the Yellowstone National Park Geology Program from sensitive thermal areas throughout the park in 2025.  National Park Service photo by Margery Price, September 3, 2025.

USGS geologists Mark Stelten (pictured) and Nicole Thomas collect a sample of what is potentially a newly recognized lava flow exposed along the Gibbon River. USGS photo by Nicole Thomas, September 2025.

Helicopter landing near GPS site WLWY to deliver personnel and equipment to repair the station’s damaged antenna cable.  Photo by Lia Lajoie, EarthScope Consortium, September 2025.

Plot of temperatures measured by continuous loggers at Guardian Geyser (light red) and Valentine Geyser (dark red) on August 24, 2025. Activity at Guardian Geyser included episodic splashing for a few hours prior to the near-simultaneous eruptions of both geysers just after 6:30 a.m. MDT on this date.  Data collected by Mara Reed, Yellowstone National Park.

Photo of Valentine Geyser and Guardian Geyser in eruption on August 7, 2025. Valentine Geyser is in the rear of the alcove, and Guardian Geyser is at the alcove’s mouth, closer to the camera. Visitors on a trail below the Norris Geyser Basin Museum can be seen at the top of the image. Photo by Carol Beverly, used with permission.

Aerial view of the summit of Mount Rainier taken during the gas flight. The photo was taken looking south, and Rainier (14,411’) rises prominently above the cloud deck at about 8,000’. Mount St. Helens (8,357’) is faintly visible in the distance.