Images

WorldView-2 natural-color satellite image from December 9, 2017, showing thermal areas as snow-free zones on the north side of Mallard Lake resurgent dome in Yellowstone National Park.

A blue glow is emitted by radiation during operation of the USGS TRIGA® Reactor, a low-power nuclear research reactor in Denver, Colorado. Photo by Christopher Farwell, October 27, 2017.

Sunset lake in Black Sand Basin of Yellowstone National Park

View of the Silver Gate landslide complex from Bunsen Peak in Yellowstone National Park.  The landslide originates from Terrace Mountain.

A weir constructed by Irving Friedman and Dan Norton to measure water discharge and to monitor changes in hydrothermal activity on a tributary flowing into Boundary Creek in southwest Yellowstone National Park. USGS photo by Shaul Hurwitz, September 17, 2017.

Focal mechanism determined by moment tensor analysis, which uses a model to fit the long-period (~10 s period or greater) ground motion records recorded at multiple locations.

Inverted funnel connected to thermoplastic tubing used to collect gas from a hot spring pool near Lassen Peak, California.

A newly emerged adult wetsalts tiger beetle. Photo by Robert K. D. Peterson, 2017.

Equipment for measuring carbon dioxide and methane emissions used to monitor changes at Steamboat Geyser in 2019. The white cylinder is the chamber, which is lowered to the ground. Gases emitted from the ground surface accumulate in the chamber. An instrument in the cart continuously measures gas concentrations and carbon isotope compositions.

Upright petrified tree in Yellowstone National Park. 

Amphitheater Mountain and Soda Butte Creek viewed from the Yellowstone National Park northeast entrance road. 

Fishing Cone, a small thermal feature near the shore of the West Thumb of Yellowstone Lake.

Hikers on Mount Everts near Mammoth Hot Springs, Yellowstone National Park.

Panoramic of the West Yellowstone rhyolite lava flow taken along Highway 20 (between the West entrance of Yellowstone National Park and Madison Junction). The flow is approximately 111,000 years old and has a volume of about 41 km³ (10 mi³). 

Big Southern Butte, a rhyolite dome located in the eastern Snake River Plain of Idaho. Photo by Devin Englestead, BLM (https://flic.kr/p/VYMDKz).

A geologist examples a basaltic lava flow along the Madison River, looking for an area that can yield samples suitable for ⁴⁰Ar/³⁹Ar geochronology.  USGS photo by Jorge Vazquez, June 2017.

Geophysicist Elske de Zeeuw-van Dalfsen (Royal Netherlands Meteorological Institute) collects a gravity reading from a station near Gibbon Falls in Yellowstone National Park. Gravity data collection was completed under Yellowstone National Park research permit 7074.

Photograph of eddy covariance and Multi-GAS stations that were deployed in a temporary configuration near Norris Geyser Basin in 2016. Research conducted under permit YELL-2016-SCI-7082.

Helicopter with airborne electromagnetics sensors dangling beneath as it flies over a portion of Yellowstone National Park.  Photo by Jeff Hungerford, November 2016.

Kullenberg coring platform from the University of Minnesota-Twin Cities Continental Scientific Drilling facility used to collect long (up to 12 m, or 40 feet) sediment cores from Yellowstone Lake.  Photo taken in September 2016 by Lisa Morgan.

Cut polycarbonate sections of sediment core collected from core YL16-3A from the Deep Hole, the deepest part of Yellowstone Lake at about 119 m (390 feet) depth, southeast of Stevenson Island. Photo taken in September 2016 by Lisa Morgan.