Volcano Hazards Program Office

Shaded relief map of Henrys Fork Caldera and vicinity. The margin of Henrys Fork Caldera is shown in blue. Note the smooth, low-relief topography within the caldera compared to the steep and dynamic topography associated with Yellowstone Caldera (at the right side of the image).

This overview photo of the Halema‘uma‘u lava lake was captured around noon on Friday, October 15, 2021, from the northwest rim of the crater. The western fissure (lower right) continues to erupt lava into the west side of the lava lake (right). The east side of the lake (left) is mostly stagnated and solidified on the surface. The lava lake measures approximately 1,035 m (

A morning overflight of Kīlauea summit on October 15, 2021, provided aerial views of the eruption within Halema‘uma‘u. Lava erupts from a single vent on the western wall of the crater. The vent has a spatter cone around it, with an opening to the east from which lava flows into the lava lake. 

Different views of an eruption from two predictable geysers. (a, c) Graphs showing water temperatures recorded by data loggers stationed near Beehive and Old Faithful Geysers, respectively. These data loggers were deployed by the Yellowstone Geology Program, configured to capture temperatures at one-minute intervals (indicated by blue dots). Significant upticks in

Example initial analyses on the water temperature data. (a, c) Graphs showing the calculated time between eruptions. (b, d) Histograms demonstrating the distribution of eruption intervals. Given this single week in June, we observe that Beehive Geyser erupted in a bi-modal fashion, preferring ~15 hour and ~19 hour intervals, while Old Faithful shows a unimodal trend with a

Research Vessel Annie and Remotely Operated Vehicle Yogi.  a) R/V Annie on Yellowstone Lake operated by the Global Foundation for Ocean Exploration.  Image Rob Harris, OSU.  b) ROV Yogi with GFOE President Dave Lovalvo.  Image Todd Gregory, GFOE.  C) ROV Yogi and 1-m heat flow probe.  This probe is shown swinging from the

Yellowstone Lake bathymetry showing the location of the Deep Hole vent field.  Inset shows locations of heat-flux measurements (red dots) in the Deep Hole vent field.

The Kīlauea summit eruption continues within Halema‘uma‘u, in Hawai‘i Volcanoes National Park. This photo of the lava lake was taken this morning, October 15, 2021, during a Hawaiian Volcano Observatory eruption overflight. The vent in the western crater wall (center) continues to supply lava into the lava lake. SO₂ gas emission rates remain elevated and were

A close-up view of the west vent on the western crater wall of Halema‘uma‘u, at Kīlauea summit. Fountaining and lava spatter has built a cone around the vent. Lava pools in the cone and then pours into the lava lake through a small spillway. This photo was taken during a monitoring helicopter overflight on October 15, 2021. USGS photo by N. Deligne.

A telephoto view of the west vent supplying lava to the lava lake in Halema‘uma‘u, at Kīlauea summit. In the bottom right, the western fissure complex from the Dec. 2020–May 2021 eruption is visible as a spiny dull dark brown and red feature. The old fissure has been lifted up by the current lava lake, and appears to be floating on the surface (similar to how an iceberg

Hawaiian Volcano Observatory scientists make observations and collect data during Kīlauea eruption overflights. The data collected is used to construct updated topographic and thermal maps of the lava lake surface and surrounding area. By comparing the updated maps to previous maps, scientists will be able to track changes in the volume, surface elevation, eruption