Images

Photo of a bull elk wintering in Yellowstone National Park. Photo by Elizabeth Mordensky, March 5, 2024.

Schematic of the Huckleberry Ridge Tuff magma storage configuration, consisting of discrete batches of magma. Analyzing the compositions of melt inclusions can help paint this type of big picture of the magmatic system. Figure modified from Myers et al. (2016).

Map of the locations of water samples collected in and around Yellowstone National Park and detailed in the USGS Data Release "Historic Water Chemistry Data for Thermal Features, Streams, and Rivers in the Yellowstone National Park Area, 1883-2021." Colors indicate type of water sample.

Illustration of the crystal growth process that leads to melt inclusion entrapment. (a) A crystal (gray area) nucleates and grows. (b) As the magma cools, the crystal corners will grow more efficiently than crystal edges. (c) This growth process will lead to the entrapment of surrounding melt (orange area).

Melt inclusions (<50 micrometers in diameter) in a quartz crystal from the Huckleberry Ridge Tuff, erupted 2.1 million years ago. Photomicrograph taken by Behnaz Hosseini at Montana State University.

Vertical motion at GPS station P720, near the Slough Creek Campground in the northeast part of Yellowstone National Park, clearly shows a large annual cycle.

Histogram showing the number of earthquakes per 3-month period (quarter) in the Yellowstone region during 1973–2023.  Red bars represent all earthquakes located in the area, and blue bars indicate swarm seismicity.

Map of Yellowstone earthquakes that were located during 1973-2023. Red circles are earthquakes located in the Yellowstone region, and blue circles indicate swarm seismicity.  The size of the circle scales with the magnitude of the earthquake.

Map of areas predicted as having conditions favorable for fostering a hydrothermal system in the western United States.  Black dots are mapped hydrothermal systems.  From Mordensky et al., 2023 (https://www.sciencedirect.com/science/article/pii/S0375650523000160).

Trigger Action Response Plan (TARP) for the Yellowstone River Bridge replacement project.  The plan gives three levels of response for various conditions that might be encountered during drilling of bridge footings.  The level of severity is indicated by the colors, with green being least severe and red being most severe.

Hydrograph showing discharge in cubic feet per second for Corwin Springs streamgage site on the Yellowstone River, MT, spanning 1889-2023.  The spike in 2022 is from the June floods of that year.

Plot of specific conductance, discharge, and temperature measured at the Yellowstone River at Corwin Springs, Montana, during early-mid 2023. The anomalous spikes in temperature and specific conductance on May 23, 2023, are thought to be when a large sand and bar was deposited at the site. May 23 is also the peak flow in 2023.

Map of seismicity (red circles) in the Yellowstone region during 2023. 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.

Infrasound-array processing for the newly installed station YNB, at Norris Geyser Basin. Top panel shows the pressure waveform from one of the three elements that comprise the array, filtered between 1 and 15 Hz. Bottom panel shows the backazimuth from the station to the source.

Thermal imagery from near Beryl Spring showing heat from a buried pipe that vents steam from the concrete containment box built in1962 around a spring that opened in the adjacent roadbed in 1942. National Park Service photo by Erin Dundas, November 8, 2023.

Shaded relief maps based on lidar data and showing fault scarps in Paradise Valley, Montana.  Lidar imagery is given as a colored, shaded slope map, with higher elevations in brown and white, and lower elevations in green. Darker shading indicates steeper slopes. Top image is a northwestward view (toward Livingston) of Paradise Valley near Carbella.

Flagg Ranch exposure showing lower unknown ignimbrite (ash flow), the Lava Creek Tuff (LCT) ash fall deposit, and upper ignimbrite of the LCT. Thanks to work by Montana State University geologists, it is now known that the unknown ignimbrite was deposited immediately prior to the ash fall, with no significant time gap in between.

Photo of ash-fall deposit of the Lava Creek Tuff overlying the lower “unknown” ignimbrite (an ash-flow unit, denoted by light yellow box).  Images of quartz-hosted melt inclusions show fully “baked” (dark) melt inclusions in the lowest ash fall layers (1–2).

Regional shaded relief map of the Eastern Snake River Plain (ESRP). The map highlights the low relief terrain of the ESRP and the dramatic rhyolite domes that punctuate it. Map by Zach Lifton, Idaho Geological Survey.

Shaded relief maps based on lidar data and showing landslides in the area of Yankee Jim Canyon, Montana. Lidar imagery is given as a colored, shaded slope map, with higher elevations in brown and white, and lower elevations in green. Darker shading indicates steeper slopes.

Scanning electron microscope (SEM) photograph of a diatom on a lodgepole pine needle from Upper Geyser Basin. A 10 micrometer (µm) scale is shown at the bottom of the image (slightly less than the width of human hair).