Images

USGS staff and Tribal GIS workshop participants

Split-beam (EK60) sonar image of bubbles (green) in the water column at a seep site overlooking Baltimore Canyon on the U.S. Atlantic margin. Although the bubbles appear to nearly reach the sea surface, the methane contained in the bubbles would have dissolved and been replaced by other gases by the time the bubbles rise several hundred meters.

Inundated marsh at Forsythe National Wildlife Refuge, New Jersey.

R/V Marcus G. Langseth entering NY Harbor

Visualization of hydrodynamics around seagrass patch.

Preview image of multi-channel seismic data collected by the USGS off the US Seaboard Atlantic as part of the US Extended Continental Shelf project.

A USGS researcher measures water and sediment movement at Forsythe National Wildlife Refuge, New Jersey.

Map showing the distribution of physiographic zones within the Buzzards Bay study area. The physiographic zone classification is adapted from Kelley and others (1998), and the zones are delineated on the basis of sea-floor morphology and the dominant texture of surficial material.

A flow tripod (taller, right) and sonar tripod (smaller, left) at the dock before being loaded onto a ship and taken to a site off Fire Island for deployment.

Bottom simulating reflector imaged in 2014 by the USGS along a seismic line acquired south of Hudson Canyon during the Extended Continental Shelf cruise.  Image provided by D. Hutchinson and reproduced from USGS Fact Sheet 3080.

Rob Thieler (left), Laura Brothers, and David Foster pull in a cable containing underwater microphones after completing a seismic survey in 2014.

Offshore Sediment texture and Geomorphology

Aerial shot of Nauset Beach in Orleans, Massachusetts.

Tribal GIS Workshop participanats.

Deployment of an instrumented quadrapod off Martha’s Vineyard, November 2014.

 An instrumented bottom lander is deployed south of Martha's Vineyard, MA in 2014 as part of the “Bottom Stress and the Generation of Vertical Vorticity Over the Inner Shelf” project.

Seismic Lab aboard R/V Marcus G. Langseth

Timeline of past drilling activities conducted by countries, private sector firms, government agencies, and academe that have helped to refine global gas hydrate estimates and possible future drilling and production testing

Airgun array aboard R/V Marcus G. Langseth

Schematic showing the general setting of seeps on the US Atlantic margin and related processes, such as gas hydrate degradation, groundwater seepage, leakage through fractured rocks, or emissions from the seafloor overlying salt diapirs. Pockmarks shown in white, and the nominal updip limit of gas hydrate stability is represented by the dashed black line.

Sample preparation and processing area in the K.O. Emery Geotechnical Wing at the Woods Hole Coastal and Marine Science Center, Woods Hole, MA