In spring and summer 2017, the U.S. Geological Survey’s Gas Hydrates Project conducted two cruises aboard the research vessel Hugh R. Sharp to explore the geology, chemistry, ecology, physics, and oceanography of sea-floor methane seeps and water column gas plumes on the northern U.S. Atlantic margin between the Baltimore and Keller Canyons. Split-beam and multibeam echo sounders and a chirp subbottom profiler were deployed during the cruises to map water column backscatter, sea-floor bathymetry and backscatter, and subsurface stratigraphy associated with known and undiscovered sea-floor methane seeps. The first cruise, known as the Interagency Mission for Methane Research on Seafloor Seeps and designated as field activity 2017-001-FA, was conducted from May 4 to May 11, 2017, and acquired geophysical data to support remotely operated vehicle exploration of seep sites using the Global Explorer, which is operated by Oceaneering International, Inc. Geophysical operations during cruise 2017-002-FA from August 25 to September 6, 2017, were also focused on mapping water column methane plumes, sea-floor seep sites, and subseafloor strata, but primarily supported conductivity, temperature, and depth instrument deployment, surface-water methane-concentration mapping, and water-sampling operations as part of a collaborative study with the University of Rochester of the effect of methane seepage on ocean water biogeochemistry. The National Oceanic and Atmospheric Administration’s Office of Ocean Exploration and Research partially sponsored cruise 2017-001-FA, and the U.S. Department of Energy partially sponsored both cruises.
These GeoTIFF grids represent the processed Reson 7160 multibeam echo sounder seafloor bathymetry data collected by the U.S. Geological Survey during USGS field activities 2017-001-FA and 2017-002-FA along the U.S. Atlantic continental shelf break and upper slope between Accomac and Keller Canyons. The data depict seafloor bathymetry associated with shelf-edge, submarine canyon, and upper slope environments in which seafloor methane seeps have been identified. The data are intended to be used in conjunction with other geophysical, ROV dive imagery, and geologic sample data to investigate sea-floor morphology and geologic framework associated with sites of methane seepage.
Theme_Keyword_Thesaurus: USGS Metadata Identifier
Theme_Keyword: U.S. Geological Survey
Theme_Keyword: Woods Hole Coastal and Marine Science Center
Theme_Keyword: Coastal and Marine Hazards and Resources Program
Theme_Keyword: Department of the Interior
National Oceanic and Atmospheric Administration - Office of Ocean Exploration and Research
Theme_Keyword: Department of Energy
Theme_Keyword: University of Rochester
Theme_Keyword: field activity number 2017-001-FA
Theme_Keyword: Interagency Mission for Methane Research on Seafloor Seeps
Theme_Keyword: field activity number 2017-002-FA
Theme_Keyword: R/V Hugh R. Sharp
Theme_Keyword: multibeam echo sounder
Theme_Keyword: multibeam bathymetry
Theme_Keyword: Reson s7k format
Theme_Keyword: HYPACK HYSWEEP HSX and 7K formats
Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword_Thesaurus: USGS Thesaurus
Theme_Keyword: multibeam sonar
Theme_Keyword: marine geophysics
Theme_Keyword: marine geology
Place_Keyword: United States of America
Place_Keyword: Atlantic Ocean
Place_Keyword: Atlantic Margin
Place_Keyword: Accomac Canyon
Place_Keyword: Washington Canyon
Place_Keyword: Norfolk Canyon
Place_Keyword: Keller Canyon
Place_Keyword: Chincoteague Ridge
Stratum_Keyword: sea floor
These data are not to be used for navigation. Mariners should refer to the appropriate nautical chart. Public domain data from the U.S. Government are freely distributable with proper metadata and source attribution. Please recognize the U.S. Geological Survey as the originator of the data set.
Originator: Demopoulos, A.
Originator: McClain-Counts, J.
Originator: Bourque, J.
Originator: Prouty, N.
Originator: Smith, B.
Originator: Brooke, S.
Originator: Ross, S.
Originator: Ruppel, C.
Examination of Bathymodiolus childressi nutritional sources, isotopic niches, and food-web linkages at two seeps in the US Atlantic margin using stable isotope analysis and mixing models.
Series_Name: Deep Sea Research Part I
Issue_Identification: 148, pp.53-66
Publication_Place: Amsterdam, Netherlands