Images

Ambae Island is in the northern Vanuatu archipelago (Figure A, courtesy of NASA) and hosts a nested caldera at its summit. A temporary seismic-acoustic array was deployed beginning July 2018 (yellow squares). Local airports are marked by the red squares.

These views of Mauna Loa are from near the Hawaiian Volcano Observatory looking toward the west. The view on left is typical during strong trade winds that blow the plume from Halema‘uma‘u Crater southwest of the summit area. The view on right is common during slack winds that allow vog conditions to develop in the summit area of Kīlauea.

Simplified geologic map (left) and diagrammatic cross section (right) of Long Valley Caldera. The resurgent dome, Doe Ridge, Mammoth Mountain, and the Inyo Craters and Domes all reflect volcanic activity since 760,000 years ago, when a giant eruption formed the caldera.

Map showing the northwestern corner of the Sour Creek Dome. The red lines mark the area where the map will be changing to become more accurate. Figure adapted from Wilson et al. 2018 (Bulletin of Volcanology, v. 80, article 53; doi:10.1007/s00445-018-1229-x).

Geologic time scale showing the geologic eons, eras, periods, epochs, and associated ages in millions of years ago (MYA). The time scale also shows major evolutionary and tectonic events in North America.

Map showing the locations of all U.S. volcanoes with their threat category designated by color. Very high threat is red, high is orange, moderate is yellow, low is green, and very low is blue. 

Mount Shasta, a steep-sided Cascade Range stratovolcano in Northern California, looms above Little Glass Mountain, a thick obsidian flow erupted from the Medicine Lake shield volcano about 1,000 years ago. These are just two of the young volcanic areas monitored by the USGS California Volcano Observatory. USGS photo.

USGS researchers Todd Burton and Joe Adams flying a UAS at the 2018 eruption of the Kilauea Volcano

UAS ground control station at the 2018 eruption of the Kilauea Volcano

Image of the 2018 Eruption of the Kilauea Volcano taken from a UAS at night

A view into the center of Pu‘u ‘Ō‘ō. Collapses on the crater walls have enlarged sections of the crater and filled the bottom of the crater with rockfall debris. The deepest portion of the crater is about 286 m (938 ft) below the crater floor that existed prior to the collapse on April 30, 2018. Steam rises from the loose rock on the crater floor. USGS image by F.

On May 7, 2019, field crews visited a telemetry hub on the rim of Pu‘u ‘Ō‘ō to assess damage after a small collapse on May 1. During the overflight, photos and observations were made of the Pu‘u ‘Ō‘ō crater. The crater walls expose a clear sequence of lava flows and cinder that built the cone in the early 1980s. USGS image by F. Younger.

This lava fountain, which erupted on September 6, 1969, during the Mauna Ulu eruption, was about 540 m (1770 ft) tall. The tephra cone, eventually named Mauna Ulu, can be seen in the fallout area (right of the fountains. in middle of image). It is now a 121 m (397 ft) tall lava shield in Hawai‘i Volcanoes National Park.

Teaching Through Technology (T3) Alliance students in the University of Hawai‘i at Hilo Upward Bound summer program install a large display showing measurements from their air-quality monitoring station outside the Pāhoa Community Center, which was used as a temporary shelter for displaced residents from Kīlauea Volcano's 2018 eruption.

Good weather provided clear views of Halema‘uma‘u during a routine visit to the webcam on the northwest rim of the caldera.

Students from the Teaching Through Technology (T3) Alliance, University of Hawai‘i at Hilo Upward Bound summer program, install an air-quality monitoring station outside the Dragon's Eye Learning Center on Papaya Farms Road. Photo courtesy of Adam Low, T3 Alliance.

HVO geologist Matthew Patrick being interviewed on the Kīlauea lava-flow field for a documentary about Hawaiian volcanism. Growing lava delta (left background) steaming at the point of ocean entry.

William Clark's 1814 map, indicating the route of John Colter during the winter of 1807-1808. (Library of Congress, Geography and Map Division, Washington, D.C.)

Amphitheater Mountain and Soda Butte Creek viewed from the northeast entrance road. National Park Service photo by Jacob Frank, June 29, 2017.

A field team from the USGS Cascades Volcano Observatory discuss station maintenance plans on the north side of Mount St. Helens, Washington. Pictured in the center of the crater is a steaming lava dome from the 2004-08 eruption, and the fractured surface of Crater Glacier emerging from the gap on the north flank.  

An HVO geologist walks along the summit trail, with Mauna Kea in the background.