Images

The photo includes five rhyolitic units of different ages: Unforested 2-ka rhyolite of "Devils chain" rests on forested 35,000 year old flow lobe from adjacent Devils Hill dome. Three pale-gray spurs form sharp salients that extend to elevations only 550 m (1640 ft) below the darker andesitic summit of South Sister.

A methane seep in shallow Lake Qalluuraq on the Alaskan North Slope near the Native Village of Atqasuk breaks the water's surface during 2009 geophysical surveys

The "Devils chain" is a string of nearly contiguous, virtually uneroded rhyolite lava domes and flows aligned north-south along a 5 km (3 mi) stretch on the southeast apron of South Sister. The largest of these is the Newberry flow (right center, below South Sister), only 2.5 km (1.5 mi) from the summit of South Sister.

This image displays expected overwash probabilities at Cape Canaveral given a typical nor’easter storm striking the coast.

Oblique photograph of Knife Ridge monitoring site showing approximate soil pit locations.

We collect terrestrial (barrier island) and marine (nearshore and estuarine) sediment cores to ground-truth geophysical observations. These cores are used to understand the history of barrier island formation and erosion.

Much of the crater rim has fallen into Pu`u `Ō `ō crater over the past few years. The most recent collapse in October removed the summit of the cone, reducing the height of Pu`u `Ō `ō by a few meters (yards).

Portions of the northwest rim of Pu`u `Ō `ō have collapsed over the past few years, with the most recent known collapse this past October.

Choctawhatchee River and gage in late December flood looking downstream. 

Wright's Creek gage and flood. 

Thanks to cooperating winds, views into Pu`u `Ō `ō Crater were only slightly obscured by fume today. These photos show a rare glimpse of the rubble covered walls and floor of the crater (looking southwest)

Thanks to cooperating winds, views into Pu`u `Ō `ō Crater were only slightly obscured by fume today. These photos show a rare glimpse of the rubble covered walls and floor of the crater (looking south)

The USGS Pacific Coastal and Marine Science Center, located in Santa Cruz, California, owns and operates the research vessel R/V Parke Snavely to collect data and run surveys.

Path left by debris flow moving down a channel. The debris flow was generated in response to a rainstorm on November 12, 2009 in Arroyo Seco, southern California.

Aluminum roofs and debris transported behind the village of Tula on the east shore of American Samoa following the Tsunami that hit the island on Sept. 29, 2009. The tsunami runup was 16-26 feet in Tula.

Tsunami flow depth at Alofau, American Samoa following the tsunami that hit the island on Sept. 29, 2009.

Tsunami flow depth indicator at Fagasa, American Samoa following the tsunami that hit the island on Sept. 29, 2009. Vegetation is brown where it was submerged by the tsunami and green above.

Car thrown into building in Pago Pago, American Samoa during the tsunami that struck the island on Sept. 29, 2009.

Boat thrown onto fish pond in Maloata, American Samoa following the tsunami that hit the island on Sept. 29, 2009.

Tsunami sand deposit at Alao, American Samoa following the tsunami on Sept. 29, 2009. Light colored sand deposited during the tsunami overlies darker soil that was there before the tsunami.