Images

Sediment cores from Twin Butte Lake, Yellowstone National Park, being analyzed in the laboratory.  (a) Photo of a freshly split core that exhibits a transition in lake productivity (grey sediment on bottom to dark organic rich sediment on top). One half of the core is scanned for multiple types of data and sampled while the other half of the core is archived.

Landsat 8 thermal infrared images of Yellowstone showing daily and seasonal differences.  In these greyscale images, bright pixels are warmer and dark pixels are cooler.  In the daytime images (A and C), you can see the effects of topography, with darker (cooler) pixels like shadows on north-facing slopes and brighter (warmer) pixels on sun-facing slopes.&

Dr. Cathy Whitlock (Montana State University) in the “core description boat” on Twin Butte Lake, Yellowstone National Park, with a freshly extruded one meter (3 feet) sediment core. Cores are described and measured in the field before being carefully wrapped for transport to the lab. Photo taken under NPS research permit YELL-2022-SCI-0009 by S.

A string of pack mules led by the National Park Service packers Hannah Miller and Ben Cunningham carrying lake coring equipment to a small backcountry lake in Yellowstone National Park; photo taken under NPS research permit YELL-2022-SCI-0009 by S. Hurwitz in August 2022.

Lake coring operations at Twin Buttes Lake, Yellowstone National Park,  (a) Assembled lake coring platform being launched into the Twin Buttes Lake and (b) anchored in the core sampling location. Photos taken under NPS research permit YELL-2022-SCI-0009 by S. Hurwitz (a) and L. Harrison (b) in August 2022.

Hillside Springs group at the margin of the Summit Lake post-caldera rhyolite lava flow (the looming cliff) in Upper Geyser Basin, Yellowstone National Park.  In the past few thousand years, the springs have occasionally deposited travertine, which can be found at the bottom of the hill below the active springs.

Extensive silica sinter breccia field along the Imperial Meadows Trail in the Lower Geyser Basin of Yellowstone National Park looking southwest towards Twin Buttes. The inset image shows a place where a passing hiker’s footstep brushed away the white surface sinter, revealing bright green phototrophic microorganisms underneath (boot toe for scale).

Field photograph showing the plateau-like nature of Timber Hill basalt. The Sweetwater Fault (yellow) vertically offsets the Timber Hill basalt at least 700 feet at this location. Photograph by Jesse Mosolf, Montana Bureau of Mines and Geology, 2022.

Boiling River, Yellowstone National Park, before and after the June 2022 flooding.  (Left) Visitors to Yellowstone National Park enjoy the warm waters of the Gardner River where it is joined by Boiling River, near Mammoth Hot Springs.  Yellowstone National Park photo by Jim Peaco, July 30, 2014.  (Right) Aerial view of Gardner River and Boiling River,

Thermal images and accompanying photographs of hot areas on Firehole Lake Drive in Lower Geyser Basin, Yellowstone National Park.  Top shows a hot pothole and deflected asphalt near Firehole Spring (images by Mark Wolf and Kiernan Folz-Donahue, July 13, 2022).  Bottom shows thermal road damage between Great Fountain Geyser and White Dome Geyser, which is v

Front cover of the Yellowstone Volcano Observatory’s Volcano and Earthquake Monitoring Plan for the Yellowstone Caldera System, 2022–2032.

Map of Yellowstone showing the location of seismic stations YSB and YUF (yellow triangles) as well as the stream gages (red triangles) at Lamar River (LRG) and the Yellowstone River (YRG) at the outlet of Yellowstone Lake.

Discharge data from the Lamar River (red line) compared to seismic data recorded at station YSB near Soda Butte Creek (a tributary of the Lamar River) during June 11–16, 2022.

Discharge data from the Yellowstone River (red line) near the outlet of Yellowstone Lake compared to seismic data recorded at station YUF near the Upper Falls of the Yellowstone River during June 11–16, 2022.

Map of SNOTEL snowpack telemetry sites (blue dots) and streamgages (red dots) in and around Yellowstone National Park.

Yellowstone River level (left) and discharge (right) during June 9–16, 2022, measured at the Corwin Springs streamgage just north of Yellowstone National Park (https://waterdata.usgs.gov/mt/nwis/uv/?site_no=06191500&PARAmeter_cd=00065,00060,00010).  The

Panoramic image of Valles Caldera, New Mexico, looking at the Valle Grande, part of the calderas “moat.”  The resurgent dome is the high topography at the left side of the image, while the hills at the center and right are lava domes.  USGS photo by Mike Poland, June 10, 2022.

Panoramic image of the Sulphur Springs thermal area in Valles Caldera, New Mexico.  The altered surface, composed of clays, strongly resembles acid-sulfate thermal areas in Yellowstone National Park, like the Mud Volcano region.  USGS photo by Mike Poland, June 10, 2022.

Photograph of the west side of Mount Everts taken from Sepulcher Mountain. The linear features seen on the western face are sedimentary rocks running north to south. (Photo by Jess Condon, June 8, 2022)

Outcrop of the Tuff of Lost Creek near Sepulcher Mountain in Yellowstone National Park.  Photo by Natalie Kraugh, Montana State University, on June 8, 2022.

The Bandelier Tuff near Los Alamos, New Mexico.  The Jemez Mountains, home to the Valles and Toledo calderas where the tuff originated, rise in the distance.  The tuff was hot and thick when it was deposited by caldera-forming eruptions 1.61 and 1.25 million years ago, and so it is welded in places, forming a dense and resistant rock.  USGS photo by M