Images

Scientists pull a seine net through a blocked-off section of a man-made ditch to estimate fish abundance.

Scientists pull a seine net through an intertidal creek to estimate fish abundance.

Sunrise over a mangrove shoreline, Shark River, Everglades National Park.

USGS SCEP displays juvenile tarpon captured in a poorly-connected tidal pond.

USGS scientist measures water velocity as part of estimating flow from a mangrove forest.

Tree after spring blizzard.

Seining for fish in open water necessitates closing the seine quickly to avoid fish escape.  Closing the seine around a pole offshore accomplishes this objective in sampling.

Tide pools provide habitat for a wide variety of Puget Sound flora and fauna.  During low tides, the captive inhabitants of tide pools may be closely inspected. 

Shallow coral reefs in the U.S. Virgin Islands are in jeopardy due to climate warming and ocean acidification.

Red knots, an at-risk shorebird, at Delaware Bay. Red knots like to feed on horseshoe crab eggs to refuel after their marathon migrations of some 10,000 miles. Declines of horseshoe crabs and red knots seem to be related.

Small debris-free plateau glacier with glacier lakes at Gangrinchemzoe Pass at 5,200 m, south of the main Himalayan divide, Bhutan. Image courtesy of Shuji Iwata, Tokyo Metropolitan University, Japan.

Wendy McCausland of the USGS Volcano Disaster Assistance Program and Hani Zahran of the Saudi Geological Survey view the southern end of the surface fault rupture caused by a M5.4 earthquake in the Saudi Arabian desert on May 19, 2009.

The Puhi-o-Kalaikini entry continues to put up a large plume just west of Kalapana Gardens. No active lava flows have been reported on coastal flats in nearly 2 weeks.

Kilauea's active summit vent is on the southeast side of Halema'uma'u Crater. In this photo, the floor of Halema'uma'u stretches out beyond the vent, and the summit of Kilauea Volcano is at upper right. The observation tower at the Hawaiian Volcano Observatory is the highest bump in the photo at Kilauea's summit.

The lava lake at Halema'uma'u has maintained the same basic geometry since February of this year. This thermal image was taken during a helicopter overflight, and shows the lava surface deep within the vent cavity. The lava surface is kidney-shaped and approximately 60 x 90 meters in size, and situated about 170 meters below the rim of the vent cavity.

A close-up view of the lava stream as seen through a lava tube skylight near the top of the Pulama pali. The lava is moving from right to left, and skylight opening is about 1 m (3 ft) across.

The Ziegler Reservoir site above Snowmass Village, Colo. The white tent in the background is the site of the original mammoth find.

Great Lakes water availability studies conducted by the U.S. Geological Survey aim to help characterize how much water the Basin has now, how water availability is changing, and how much water it can expect to have in the future.

USGS gage house located at Devils Lake near Devils Lake, ND has recorded 100 years of data.

USGS river gage at Grand Forks, ND along the Red River of the North has recorded 100 years of data. View of auxiliary gage about 3 miles downstream from base gage.

This is an image of a gas drilling rig in Colorado.