Images

An unnamed but charismatic thermal feature alongside Ferris Fork, near the Bechler River. The center of the pool is roiling with gas bubbles, but not boiling! The pool is only about 180 degrees F (81 degrees C), and all the gas is bubbling up from underground.

Mules loaded with sampling equipment and supplies for a mission to collect gas and thermal water samples from the Bechler River area in the southwest part of Yellowstone National Park. 

Ear Spring photographed on September 16, 2018. Rocks and other debris on the ground surrounding the spring were ejected during the September 15 water eruption. The spring is dry in this photo.

Serapeum, a Roman Marketplace in Pozzuoli, Italy, records deformation of Campi Flegrei caldera over two millennia.

Dragon’s Mouth in the Mud Volcano Area of Yellowstone National Park.

The Basalts of Warm River and Shotgun Valley, which erupted about 1.17 million years ago after the formation of Henrys Fork Caldera in southeast Idaho.  Photo by Brandi Lawler, University of Wyoming, August 8, 2018.

Hot spring waters with relatively high dissolved element concentrations on the floor of West Thumb, Yellowstone Lake. Image acquired by the Global Foundation for Ocean Exploration ROV Yogi on August 7, 2018.

Mushroom Pool, Lower Geyser Basin, Yellowstone National Park.

100 Spring Plain in Norris Geyser Basin, Yellowstone National Park.  The area is frequently flooded and impassable. Photo taken by Lauren Harrison in August 2018.

The Pinehaven Basalt, which erupted in Henrys Fork Caldera, southeast Idaho, about 35,000 years ago.  Photo by Brandi Lawler, University of Wyoming, August 6, 2018.

Fishing cone, a hot springs on the floor of Yellowstone Lake. The hot spring rim sits at lake level.

A sensor data logger recovered from the floor of Yellowstone Lake in the Deep Hole area in 2018 shows signs of melting due to unexpectedly high temperatures in sediments up to ~3 ft (1 m) away from an active hydrothermal vent. Image acquired by the Global Foundation for Ocean Exploration ROV Yogi on August 4, 2018.

Sensor deployed in the Deep Hole, east of Stevenson Island to monitor long-term temperature and chemical variations in an active vent. Image acquired by the Global Foundation for Ocean Exploration ROV Yogi on August 4, 2018.

Sensor (top), deformed battery/electronics package (bottom), and titanium sheath (left) following recovery from vent location A in teh Deep Hole area on the floor of Yellowstone Lake.

Sensor (left) and battery/electronics package (right) at vent location A in the Deep Hole area of Yellowstone Lake.  Photo was taken immediately before recovery from the lake floor. Notice the battery/electronics package slightly submerged in sediment.

Electrical Resistivity Tomography (ERT) line R3 during setup of ERT and induced polarization measurement near Rosette Spring, Lower Geyser Basin.  Photo by University of Wyoming Geophysics Team, July 17, 2018.

Spectrogram and wind data from stations on Stevenson Island for June 30, 2018. Warm colors in the spectrogram correspond to stronger seismic energy compared to cool colors. The ~1-second-period lake-generated microseism (outlined by the black box) that was generated on this day is correlated with elevated wind speeds (red circles) as a storm passed by overnight.

River Styx, Mammoth Hot Springs, Yellowstone National Park. This thermal feature is actually a subterranean hot water creek that likely collects water discharged from Mammoth Hot Spring pools that, after cooling and outflowing from vents, tends to disappear back underground through the porous travertine.

View of Lower Geyser Basin, with Fountain and Clepsydra Geysers in eruption, looking south towards Fountain Paint Pots. The vegetation in the photo is indicative of vegetation throughout much of Lower Geyser Basin—open grassland maintained by hot ground with patches of lodgepole pine.

A nodal seismometer can be easily deployed for a month in a closely spaced array of tens of instruments. Arrays have been installed at Yellowstone National Park to map subsurface of geyser basins.

Steamboat Geyser in the water-phase of an eruption on June 4, 2018, Norris Geyser Basin, Yellowstone National Park.