Images

Elliot State Forest.

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.

Electronics building at Ewa Beach, HI magnetic observatory.

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.

Aerial overview of the Old Faithful area from the northeast.

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 Happy Isles streamgage house with explanatory exhibits on the Merced River, Yosemite Valley.

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.

Older debris-flow sediment deposits in lower Emerson Gulch, burned by the Fourmile Canyon wildfire; view is upstream.

Upper Emerson Gulch, burned by the Fourmile Canyon wildfire; view is downstream.

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.

Cayey, Puerto Rico geomagnetic observatory.

The R/V Rafael performs nearshore geophysical surveys, and includes high resolution sub-bottom profiling, sidescan sonar, and multibeam echosounding in its arsenal of survey capabilities.

Absolutes, variations and proton buildings at Cayey magnetic observatory, Puerto Rico.