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Eel River Basin, offshore northern California, contains geochemical and geophysical evidence that hydrocarbon gases are present in the sediment column as indicated by 1) measurements of hydrocarbon gas in samples of near-surface sediment; 2) seafloor craters and gas plumes imaged on side-scan sonar records; 3) acoustic anomalies on seismic records of Quaternary and pre-Quaternary strata; and 4) bottom-simulating reflectors, which are acoustic anomalies indicating the possible presence of gas hydrates. This evidence results from four U.S. Geological Survey research cruises to the Eel River Basin and is derived from analysis of short (1-3 m) gravity cores and information from...

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