Images

Hot Creek Gorge viewed upstream toward the southwest; the steep walls of the gorge consist of a single rhyolite lava flow erupted from a vent 4 km (2.5 mi) to the south.

Bubbling Spring, a feature of Hot Creek in the Long Valley Caldera, California, occasionally "boils" due to high water temperature.

Helicopter dropping off monitoring equipment at Mount St. Helens, Washington.

The "spider" (a self-contained portable instrument package) was engineered and deployed during the 2004-2008 eruption of Mount St. Helens to detect and triangulate shallow earthquakes, monitor local ground deformation and uplift, detect lightning that might indicate an ash eruption and low frequency sound from explosions.

HVO geologists noted persistent spattering in the northeast corner of the lava lake within the Overlook vent during their night-time observations. The view of the lake surface was fairly good because of fume in the area of the Overlook was "thin" at the time.

Kate Bull using a FLIR camera out the open door of an A-Star helicopter with the Redoubt summit and lava dome visible.

Incandescence from the lava lake surface (out of view) reflects an awesome glow on the gas plume rising from the lake surface.

Mount Bachelor, Oregon viewed from the east.

Hydrothermal explosion at Biscuit Basin in Yellowstone National Park. These types of events are the most likely explosive hazard from the Yellowstone Volcano.

HVO field crews collect temperature data on ground cracks in the Leilani Estates subdivision near the fissure complex. On this day, temperatures ranged from from 100 to 145 degrees C (200 to 300 degrees F), consistent with past readings.

The summit plume from Halema‘uma‘u Crater (elevation 3,670 feet), hugs the southeast flank of Mauna Loa as it is blown by the northeasterly trade winds toward the southern point of the Island of Hawai‘i.

Lava from the Pu'u 'Ō'ō-Kupaianaha eruption, active since 1983, enters the ocean on the south flank of Kīlauea Volcano.

Cyrus Read installing the new, zoomable web camera at the AVO research hut north of Redoubt Volcano.

Redoubt Volcano viewed from the northwest following the April 4, 2009 eruption (Event 19). Steam rises from the summit crater, pyroclastic flow and surge deposits drape the flanks, and lahar deposits cover the Drift River Valley. 

From the 2009 eruption of Redoubt Volcano. The original photo can be found at: http://www.avo.alaska.edu/images/image.php?id=17800

Fieldwork northeast of Redoubt volcano. Kristi Wallace measuring and collecting ash samples from the current eruption.

Redoubt volcano with minor ash eruption. Photograph taken during observation and gas data collection flight by AVO staff March 30, 2009.

Community engagement and emergency preparedness can mitigate exposure to volcanic events.  Sign at Nikiski Fire Department on March 28, 2009. Ash fall up to a millimeter thick from Redoubt Volcano occurred twice during the 2009 eruption on this area. AVO photo.

Nikiski Fire Department on March 28, 2009. Ash fall up to a millimeter thick from Redoubt volcano occurred twice during the 2009 eruption on this area (March 26 and March 28). 

This thermal image (white is hot, dark blue is cold), taken during today's helicopter overflight, shows the current vent configuration at Halema`uma`u crater. The vent cavity is about 130 meters (430 ft) wide, and has consumed portions of the wall and floor of Halema`uma`u crater.

A volunteer helps HVO staff complete maintenance on a monitoring site on Kīlauea Volcano.