Images

Photograph showing roadcut exposure of Huckleberry Ridge Tuff and Mesa Falls Tuff along U.S. Route 20 between Ashton and Island Park, Idaho. This exposure is approximately 60 feet high.

Field crew from Oregon State University and University of Wisconsin-Madison install a magnetotelluric site within Yellowstone National Park. 

Changes in snow conditions at a gravity station in Yellowstone National Park in 2017. Each photo is taken from about the same location in May, July, August, and October of that year. The red circle in the May photograph shows the location of the gravity station in this area, which is near Craig Pass, a few miles southeast of Old Faithful.

Map of gravity stations measured in 2017 in Yellowstone National Park. Yellow lines are roads, dashed line marks the caldera boundary, black line outlines Yellowstone National Park, green circles note resurgent domes, and red dots are gravity stations.

The head of an immature wetsalts tiger beetle at the entrance to the burrow it dug. Photo by Robert K. D. Peterson, 2017.

Steam-driven vents on the floor of Yellowstone Lake in the Deep Hole, east of Stevenson Island. Image acquired by the Global Foundation for Ocean Exploration ROV Yogi in August 2017.

Dr. Jacob Lowenstern, Scientist-in-Charge of the Yellowstone Volcano Observatory during 2002-2017. In this photo, he's leading a field trip in Yellowstone National Park with a group of international volcanologists. 

Map showing volcanoes that formed at the leading edge of the Yellowstone hotspot in the past several million years.  (A) Map of northwest Wyoming, eastern Idaho, and southern Montana (modified from Brueseke et al., 2017, https://doi.org/10.1130/GES01553.1).  Upper Wind River Basin (UWRB) is depicted by dashe

Grant Village boat dock, on the West Thumb of Yellowstone Lake, where a water-level sensor measures the level of the lake. Photo by David Mencin (EarthScope Consortium).

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.

Echinus Geyser in eruption on October 24, 2017.  Photo by MA Bellingham, used with permission.

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

Sunset lake in Black Sand Basin of Yellowstone National Park

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.

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.