Images

The Ice Piston with Ash, Redoubt Volcano, Alaska. This photo was taken on March 21, 2009, the day before Redoubt first erupted. The glacier that filled the crater was collapsing because of the increase in ground temperature underneath.

2009 flooding on the Knife River near Hazen, North Dakota.

USGS Scientist-in-Charge (SIC) of the Alaska Volcano Observatory, Tom Murray, gets first-hand look at the heightened activity of Redoubt volcano.

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

Research geologist Michelle Coombs monitors information on Redoubt during a restless period.

USGS scientist Heather Bleick prepares documentation equipment for a flight over Redoubt Volcano.

The village of Naiyobi, about 5 miles from the summit of Ol Doinyo Lengai, has had ashfall from recent eruptions that have impacted residents and their cattle.

Scientists from the Volcano Disaster Assistance Program team and the Geological Survey of Tanzania take a sample of the most recent ashfall from Ol Doinyo Lengai as the volcano looms in the background.

The village of Naiyobi, about 8 km (5 mi) from the summit of Ol Doinyo Lengai Volcano.

USGS Scientist David Sherrod and a guide complete digging for ash samples from the most recent eruption of Ol Doinyo Lengai Volcano in Tanzania.

USGS Scientist David Sherrod surveys Ol Doinyo Lengai Volcano in Tanzania with scientists from the Geological Survey of Tanzania and local villagers.

USGS volcanologist David Sherrod discusses activity at Ol Doinyo Lengai volcano with the Director of the Tanzanian Geological Survey, Abdul Mruma, as a local Maasai woman observes.

Marinna Martini, Woods Hole, Coastal and Marine Science Center,  prepares to deploy tripods at three sites along the outer perimeter of Diamond Shoals, North Carolina.

 USGS researchers deploying an instrumented minipod South of Fire Island, NY.

Medicine Lake lies within the shallow basin of Medicine Lake caldera. Glass Mountain flow, draped over the east side of the volcano, is the youngest lava flow at the volcano. The northeasternmost dacite tongue extends nearly to the bottom of the photo (distal lobes are outlined to enhance visibility).

Vog obscures view during slack or no tradewinds at the summit of Kīlauea Volcano, Hawai‘i

(Top image) Shaded relief of the new multibeam bathymetry along the Puerto Rico Trench illuminated from the northwest. Thin contours indicate bathymetry at 500-m intervals. (Bottom image) Combined bathymetry map of the multibeam bathymetry data, single-beam bathymetry compilation around Puerto Rico, Lidar data near shore, and topography of Puerto Rico.

Woods Hole Coastal and Marine Science Center's Ellyn Montgomery (right) on the helipad of the Canadian Coast Guard Vessel Louis St. Laurent returning from an ice reconnaissance flight as part of a joint study mapping the foot of the continental slope in the Arctic Ocean in 2008

A filtered vertical laser image, taken using a technique called light detection and ranging (LIDAR), of part of the Hayward Fault (red lines) in the City of Berkeley. The fault passes through the University of California Berkeley football stadium (left), and past earthquake movements have significantly offset Hamilton Gulch (center).

View of the west channel and Upper monitoring station (Station 1), Chalk Cliffs, CO.

View southwest of Garfield Peak and Eagle Crags above Chaski Bay. Cliffs at caldera rim are andesite of Applegate Peak (unit aa; ca. 210-270 ka), overlain by two thin flows of andesite of Garfield Peak at top center (unit ag; 224 ±9 ka). Talus rests on flat top of massive slide block that consists of altered lavas of units aa, ak(?), and db(?).