Publications
Scientific reports, journal articles, and information products produced by USGS Pacific Coastal and Marine Science Center scientists.
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Sound Waves Newsletter
Sound Waves Newsletter
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Filter Total Items: 1331
Marine geological and geophysical investigations in the Ross Sea, Antarctica
No abstract available.
Authors
Alan K. Cooper, F.J. Davey
Ferromanganese crusts from Necker Ridge, Horizon Guyot and S.P. Lee Guyot: Geological considerations
Necker Ridge, Horizon Guyot and S.P. Lee Guyot in the Central Pacific were sampled, seismically surveyed, and photographed by bottom cameras in order to better understand the distribution, origin, and evolution of ferromanganese crusts. Necker Ridge is over 600 km long with a rugged crest, pods of sediment to 146 m thick, slopes that average 12° to 20°, and debris aprons that cover some of the low
Authors
James R. Hein, Frank T. Manheim, William C. Schwab, Alice S. Davis
An empirical equation of state for hydrothermal seawater (3.2 percent NaCl)
No abstract available.
Authors
James L. Bischoff, Robert J. Rosenbauer
Seismic and geochemical evidence for shallow gas in sediment on Navarin continental margin, Bering Sea
Marine seismic studies coupled with geochemical investigations demonstrate that hydrocarbon gases are ubiquitous in the near-surface (<= 250 m or 820 ft depth) sediment of the Navarin continental margin in the northern Bering Sea. Three types of acoustic anomalies appear to be related to the presence of gas in the sediment. These anomalies are most prevalent in the northern half of the Navarin bas
Authors
Paul R. Carlson, Margaret Golan-Bac, Herman A. Karl, Keith A. Kvenvolden
Rippled scour depressions on the inner continental shelf off central California
Side-scan sonar records taken during the recent Coastal Ocean Dynamics Experiment (CODE) show elongate, shore-normal rippled depressions of low relief on the inner continental shelf off central California between Bodega Bay and Point Arena. These features extend up to 2 km from the coast into water depths of up to 65 m. The proposed mechanism for their generation is storm-generated bottom currents
Authors
David A. Cacchione, David E. Drake, William D. Grant, George B. Tate
Uptake and transport of heavy metals by heated seawater: A summary of the experimental results
In general, the chemistry of seawater experimentally reacted with basalt is in accord with the observed chemistry of the 350°C vent waters from 21°N on the East Pacific Rise. Experiments at 350°C, 500 bar, and a water/rock ratio of ≤10 reproduce most of the major components in the vent waters, in particular the low Mg and SO4 and high Si02, Ca, and K. In comparison with the vent waters however the
Authors
Robert J. Rosenbauer, James L. Bischoff
Molecular and isotopic compositions of hydrocarbons at Site 533, Deep Sea Drilling Project Leg 76
In an investigation of gas hydrates in deep ocean sediments, gas samples from Deep Sea Drilling Project Site 533 on the Blake Outer Ridge in the northwest Atlantic were obtained for molecular and isotopic analyses. Gas samples were collected from the first successful deployment of a pressure core barrel (PCB) in a hydrate region. The pressure decline curves from two of the four PCB retrievals at i
Authors
J.M. Brooks, L.A. Barnard, D.A. Wiesenburg, M.C. Kennicutt, Keith A. Kvenvolden
Pressure core barrel; application to the study of gas hydrates, Deep Sea Drilling Project Site 533, Leg 76
A pressure core barrel (PCB), developed by the Deep Sea Drilling Project, was used successfully to recover, at in situ pressure, sediments of the Blake Outer Ridge, offshore the southeastern United States. The PCB is a unique, wire-line tool, 10.4 m long, capable of recovering 5.8 m of core (5.8 cm in diameter), maintained at or below in situ pressures of 34.4 million Pascals (MPa), and 1.8 m of u
Authors
Keith A. Kvenvolden, D. Cameron
Methane and other hydrocarbon gases in marine sediment
No abstract available.
Authors
G. E. Claypool, Keith A. Kvenvolden
Concentrations and carbon isotopic compositions of CH4 and CO2 in gas from sediments of the Blake Outer Ridge, Deep Sea Drilling Project Leg 76
The principal gaseous carbon-containing components identified in the first 400 m of sediment at Deep Sea Drilling Project Site 533, Leg 76, are methane (CH4 ) and carbon dioxide (CO2 ). Below a sub-bottom depth of about 25 m, sedi ment cores commonly contained pockets caused by the expansion of gas upon core recovery. The carbon isotopic com position (δ13C %0 relative to PDB standard) of CH4 and C
Authors
E.M. Galimov, Keith A. Kvenvolden
Tectonic evolution of Gulf of Anadyr and formation of Anadyr and Navarin basins
New seismic reflectionand refraction data reveal that Anadyr basin is separated from Navarin basin by Anadyr ridge, a southeast-northwest-trending bedrock high that is characterized by high-amplitude, short-wavelength magnetic anomalies. Anadyr ridge may be an offshore extension of the melange belt underlying the Koryak Range. Sonobuoy refraction data indicate that the velocity profile of strata i
Authors
Michael S. Marlow, Alan K. Cooper, Jonathan R. Childs
Wandering terranes in southern Alaska: The Aleutia Microplate and implications for the Bering Sea
Paleomagnetic and geological data suggest that much of southern Alaska is a collage of tectonostratigraphic terranes which originated in Mesozoic time at paleolatitudes far south of their present position. The time of ‘docking’ of the terranes against cratonic Alaska is critical to defining their amalgamated size and extent during their northward motion as well as their role in the evolution of th
Authors
Michael S. Marlow, Alan K. Cooper