Images

An HVO geologist uses GPS to map and track the progress of an ‘A‘ā lava flow in Royal Gardens subdivision in 2008. USGS photo.

An HVO scientist collects gravity data from a site on the rim of Kīlauea caldera. The active summit vent in Halema‘uma‘u Crater is visible in the background. USGS photo.

Map of Kīlauea Volcano showing the south-southeast motion, as recorded by continuous GPS sites (arrows), and earthquake epicenter between February 1-3, 2010.

Volcanic monitoring types and methods employed by the USGS Volcano Hazards Program.

Mount Baker's northeastern face, Washington.

HVO geologist describes activity from Kīlauea Volcano during a field trip to the coastal lava flow field for members of the media in 2010.

Seismicity is shown for January 17, 2010 through the Feb 8, 2010. Borehole seismometer B207 is located about 7 miles (12 km) northeast of the 2010 swarm. Seismic data are provided by the National Science Foundation funded Plate Boundary Observatory operated by UNAVCO.

Fast-moving lava flows erupted from Mauna Iki were hand-colored in this black-and-white photo taken on May 17, 1920. Historic photo courtesy of Roger and Barbara Myers.

Suspended sediment sample collection from the North Fork Toutle River above the Sediment Retention Structure, downstream from Mount St. Helens.

Solar-powered seismic station located near the summit of Mauna Loa Volcano, Hawai‘i.

MODIS Aqua 1 km true color satellite image showing resuspended volcanic ash cloud (arrow) generated from high winds scouring exposed ash on the Pacific side of the Katmai volcanic range. The cloud stretches across the Shelikof Straight and western Kodiak Island. Image ID 2010333 taken November 29, 2010. Courtesy NASA.

This MODIS Aqua 1-km-resolution, true-color satellite image shows a resuspended ash cloud generated from high winds scouring the dry, unvegetated deposits in the Valley of Ten Thousand Smokes. The cloud stretches across Shelikof Strait to western Kodiak Island.

Location: south-central Alaska, from Kodiak to Anchorage

Photo of the Puhi-o-Kalaikini lava delta taken on Thursday, October 28, 2010, prior to the collapse. The line shows the approximate inland boundary of the area that collapsed into the ocean on November 2.

Sulfur dioxide gas emissions from the crater of Pu‘u ‘Ō ‘ō on Kīlauea’s east rift zone and the vent within Halema‘uma‘u Crater at Kīlauea’s summit create volcanic pollution that affects the air quality of downwind communities.  Here, a USGS Hawaiian Volcano Observatory gas geochemist measures Pu‘u ‘Ō‘ō gas emissions using an instrument that detects ga

MODIS Aqua 1-km resolution true color satellite image shows a resuspended ash cloud generated from high winds scouring the dry, unvegetated deposits in the Valley of Ten Thousand Smokes. The cloud stretches across Shelikof Strait to western Kodiak Island.

Seismometer installed in a vault above ground at Mount Baker, Washington. These are typically buried but Forest Service restrictions required it be installed above ground.

Pacific Northwest Seismic Network scientists checking data prior to uncovering an above ground seismic vault, Mount Baker, Washington.

USGS installed sensors to track water pressure through the Spirit Lake outflow tunnel. View from inside the tunnel during the 2010 tunnel closure and inspection period. Spirit Lake is located north of Mount St. Helens.

Kulshan Caldera's intracaldera ignimbrite deposit near Upper Swift Creek in the northwestern Mount Baker volcanic field, Washington.

YVO's mobile webcam system as deployed in September 2010 near Lake Butte.

Mount St. Helens, as viewed from Coldwater Ridge around sunset.