none 10.1190/INT-2021-0248.1 Society of Exploration Geophysicists Society of Exploration Geophysicists 186 139282657 226307 2025120914020709400 10.1190 2025-12-09T19:02:19Z 2022-08-01T09:05:05Z 6 Interpretation 2324-8858 2324-8866 11 01 2022 10 4 Urmi Majumdar Woods Hole Oceanographic Institution 1 , Woods Hole, Massachusetts, USA and , Woods Hole, Massachusetts, USA. urmi.geology@gmail.com U.S. Geological Survey 1 , Woods Hole, Massachusetts, USA and , Woods Hole, Massachusetts, USA. urmi.geology@gmail.com http://orcid.org/0000-0002-2469-337X Nathaniel C. Miller U.S. Geological Survey 2 , Woods Hole, Massachusetts, USA. ncmiller@usgs.gov (corresponding author) http://orcid.org/0000-0003-3271-2929 Carolyn D. Ruppel U.S. Geological Survey 2 , Woods Hole, Massachusetts, USA. cruppel@usgs.gov http://orcid.org/0000-0003-2284-6632 Abstract Bottom-simulating reflections (BSRs) that sometimes mark the base of the gas hydrate stability zone in marine sediments are often identified based on the reverse polarity reflections that cut across stratigraphic layering in seismic amplitude data. On the northern U.S. Atlantic margin (USAM) between Cape Hatteras and Hudson Canyon, legacy seismic data have revealed pronounced BSRs south of the deepwater extension of Hudson Canyon and more subtle ones from offshore Delaware south to Cape Hatteras, where the reflections sometimes follow stratigraphic layering. Using high-resolution seismic data acquired during the 2018 Mid-Atlantic Resource Imaging Experiment and a supervised neural net, we identify seismic features associated with gas hydrates and/or the top of gas between Hudson Canyon and Cape Hatteras. Using seismic attributes especially sensitive to the presence of gas, we train a neural network algorithm on seismic data from an area with strong BSRs and then apply the model to the rest of the data set. The results indicate that gas hydrate and/or shallow free gas are significantly more widespread on the northern part of the USAM than previously known. Seismic indicators of gas extend landward from the 2000 m isobath to the upper continental slope in sectors with (offshore Virginia) and, to a lesser extent, without (offshore New Jersey) pervasive upper slope methane seeps. 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