Images

Big Ben Volcano on Heard Island. Credit: Australian Antarctic Division (A.J. Graff).

Temperature record from Echinus Geyser outflow channel for February 6, 2026, at 8 p.m. MST to February 7, 2026, at 8 a.m. MST.  The plot shows initial baseline temperatures, then two spikes to 50 °C representing water surges, then an eruption marked by a spike to 70 °C followed by a lull to 10 °C, and finally a return to baseline.

(a) NAIP (National Agriculture Imagery Program) natural-color aerial photograph of Secret Valley Hot Springs, in the backcountry between Norris Geyser Basin and Madison Junction, from September 25, 2015, showing snow-free zone mapping based on snowy wintertime imagery from multiple years. The mapped boundaries of the thermal area are indicated by the orange out

(a) NAIP (National Agriculture Imagery Program) natural-color aerial photograph of Fern Lake, in the east part of Yellowstone National Park, from July 17, 2022, showing mapped locations of liquid water during the winter when the rest of the water body was iced over.  The mapped boundary of the lake is indicated by the orange outline, with shaded areas noting re

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

Map of uplift as seen by interferometric synthetic aperture radar (InSAR) covering the time between October 7, 2024, and October 2, 2025 (the uplift began in July 2025) along the north rim of Yellowstone Caldera to the south of Norris Geyser Basin (NGB). 

Map of seismicity (red circles) in the Yellowstone region during 2025. Gray lines are roads, black dashed line shows the caldera boundary, Yellowstone National Park is outlined by black dot-dashed line, and gray dashed lines denote state boundaries.

The 2013–2014 Norris Geyser Basin (NGB) uplift and associated earthquakes.

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.

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.

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.

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).

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.

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.

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.