Images

(Top) Methane plumes at the Norfolk Canyon seeps (~1600 meters or 5250 feet) were detected using the EK60 sonar. The water column plumes are shown above the sub-seafloor structure as imaged by high-resolution multichannel seismic data acquired by the USGS and processed by J. Kluesner.

Methane plume imaged by the 30 kHz multibeam system

Map of the general expedition area on the northern U.S. Atlantic Margin between Baltimore Canyon and Cape Hatteras

Area map of National Seafloor and Habitat Mapping Studies-Atlantic

 Map of distribution of fine- and coarse-grained sand, Stellwagen Bank.  Blue and purple = boulder ridges.  Redlines = leading edges of sand sheets

Fieldtrip participants at the former San Clemente Dam site.

Emily Sturdivant, with the help of her co-pilot, hits the landing target.

USGS research oceanographer Neil Ganju shares a time-lapse video showing salt marsh erosion.

Views of Madeira Beach, Florida, produced from a 17-minute video shot on June 20, 2017. Left: Snapshot, or first frame of video. Right: Time-averaged image, sometimes called a “timex,” created by averaging the intensity of light recorded at each spot, or “pixel,” during the 17-minute video.

“Variance” images derived from the same videos used in the studies. Left, Madeira Beach; right, Cowells Beach. In a variance image, the more variation in light intensity at a given pixel, the brighter the value assigned to that pixel. Bright areas indicate many changes in light intensity, caused by a lot of movement.

Close-up views of the toe of the Mud Creek landslide created from air photos taken May 27 (top), June 13 (middle), and June 26 (bottom). Caltrans built roads on top of the slide for assessment and monitoring activities.

Gerry Hatcher with the system he designed to record the precise time and geographic location of each air photo Van Wagenen shoots.

Paul’s Slide. Left: Air photo taken May 27, 2017, one of many that Beth Haddon will analyze with structure-from-motion software to measure changes in ground elevation. Right: Caltrans employees and contractors use an excavator and bulldozer to remove Paul’s Slide debris from California State Highway 1.

Tracklines along which R/V Ocean Starr (2017, red lines) and R/V Norseman (2016, black lines) conducted seismic-reflection surveys, overlaid on high-resolution bathymetry (color background). Yellow stars represent earthquakes of magnitude (M) 7 and greater since 1900.

Map showing the location of the Delmarva Peninsula with a hillslope shaded relief map of the study area. 

(A) Maximum Likelihood Classification (MLC) with two inputs, slope, and ISO-classified backscatter for the whole survey area. (B) MLC with five inputs, slope, ISO-classified backscatter, bathymetry, hillshaded-relief, and curvature.

A look into the USGS Pacific Coastal and Marine Science Center’s Marine Minerals Laboratory Suite.

A look into the USGS Pacific Coastal and Marine Science Center’s Marine Minerals Laboratory Suite.

Photo shows results of wave-driven flooding and overwash on Roi-Namur Atoll, Republic of the Marshall Islands.

Diagram of different ocean features that contribute to coastal flooding.

Elizabeth Pendleton describes USGS work to map the Massachusetts seafloor to State Senator Viriato “Vinny” deMacedo.