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  • Other Sources  (8)
  • Society of Exploration Geophysicists  (6)
  • American Association for the Advancement of Science
  • American Association for the Advancement of Science (AAAS)
  • Cell Press
  • 1995-1999
  • 1985-1989  (8)
  • 1980-1984
  • 1975-1979
  • 1940-1944
  • 1986  (8)
Collection
Source
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Years
  • 1995-1999
  • 1985-1989  (8)
  • 1980-1984
  • 1975-1979
  • 1940-1944
Year
  • 1
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    Estimation of reflection coefficients fom seismic data (1986)
    Society of Exploration Geophysicists
    In:  abstract , Tulsa, Oklahoma, Society of Exploration Geophysicists, vol. 339-350, no. 32, pp. 103-108, (ISBN 3-933346-037)
    Details
    Publication Date: 1986
    Keywords: Reflection seismics ; Seismics (controlled source seismology)
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    BIBLIOGRAPHY SEISMOLOGY
  • 2
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    Seismic filter design from borehole data (1986)
    Society of Exploration Geophysicists
    In:  abstract , Tulsa, Oklahoma, Society of Exploration Geophysicists, vol. 339-350, no. 32, pp. 103-108, (ISBN 3-933346-037)
    Details
    Publication Date: 1986
    Keywords: Seismics (controlled source seismology) ; Filter- ; Borehole geophys.
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    BIBLIOGRAPHY SEISMOLOGY
  • 3
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    Decomposition of seismic traces (1986)
    Society of Exploration Geophysicists
    In:  abstract , Tulsa, Oklahoma, Society of Exploration Geophysicists, vol. 339-350, no. 32, pp. 103-108, (ISBN 3-933346-037)
    Details
    Publication Date: 1986
    Keywords: Seismics (controlled source seismology)
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    BIBLIOGRAPHY SEISMOLOGY
  • 4
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    Prime line data acquisition and processing (1986)
    Society of Exploration Geophysicists
    In:  2. Annual Gulf Coast Exploration and Development Meeting and Exposition of the SEG, New Orleans, Louisiana, Society of Exploration Geophysicists, vol. C 560, 183 pp., no. 11, pp. 977-992, (ISBN 3-933346-037)
    Details
    Publication Date: 1986
    Keywords: Data analysis / ~ processing ; Seismics (controlled source seismology)
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    BIBLIOGRAPHY SEISMOLOGY
  • 5
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    Acoustic response of manganese nodule deposits (1986)
    Society of Exploration Geophysicists
    In:  Geophysics, 51 (3). pp. 689-698.
    Details
    Publication Date: 2017-03-01
    Description: Backscattered acoustic intensities are studied analytically for manganese nodule deposits excited by a normally incident plane wave. The primary objective is to use this remote‐sensing technique to infer the nodule concentration as well as its size distribution from the frequency spectrum of the acoustic response. For sparse distributions of scatterers, multiple scattering theory has been used to obtain the coherent reflection and transmission coefficients from the sea floor covered with manganese nodules. The derived equations can also be used for densely distributed configurations when considering higher‐order statistics between scatterers. The validity of the formalism is examined by using the principle of conservation of energy and considering both the coherent and the incoherent intensities. Numerical results of acoustic intensities are highly frequency‐dependent, especially when the nondimensional frequency ka is greater than 1. The strength of the acoustic intensity is proportional to nodule concentration. Different size distributions of nodules can be distinguished through use of the intensity measurements. However only a minor difference is observed in the low‐frequency range between uniform and Rayleigh size distributions.
    Type: Article , PeerReviewed
    Format: text
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  • 6
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    Fluid pressure response to undrained compression in saturated sedimentary rock (1986)
    Society of Exploration Geophysicists
    In:  Geophysics, 51 (4). pp. 948-956.
    Details
    Publication Date: 2017-01-30
    Description: The pore pressure response of saturated porous rock subjected to undrained compression at low effective stresses are investigated theoretically and experimentally. This behavior is quantified by the undrained pore pressure buildup coefficient, B = (dPf/dPclld,"f~O' where Pf is fluid pressure, P, is confining pressure, and mf is the mass of fluid per unit bulk volume. The measured values for B for three sandstones and a dolomite are near 1.0 at zero effective stress and decrease with increasing effective stress. In one sandstone, B is 0.62 at 13 MPa effective stress. These results agree with the theories of Gassmann (1951) and Bishop (1966), which assume a locally homogeneous solid framework. The decrease of B with increasing effective stress is probably related to crack closure and to high-compressibility materials within the rock framework. The more general theories of Biot (1955) and Brown and Korringa (1975) introduce an additional parameter, the unjacketed pore compressibility, which can be determined from induced pore pressure results. Values of B close to 1 imply that under appropriate conditions within the crust, zones of low effective pressure characterized by low seismic wave velocity and high wave attenuation could exist. Also, in confined aquifer-reservoir systems at very low effective stress states, the calculated specific storage coefficient is an order of magnitude larger than if less overpressured conditions prevailed.
    Type: Article , PeerReviewed
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  • 7
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    Antarctic Mesopelagic Micronekton: Evidence from Seabirds That Pack Ice Affects Community Structure (1986)
    American Association for the Advancement of Science (AAAS)
    In:  Science, 232 (4752). pp. 847-849.
    Details
    Publication Date: 2016-10-05
    Description: Through a multidisciplinary project (AMERIEZ), with an unusual complement of components, previously unknown temporal and spatial dimensions to the structure of Antarctic epipelagic and mesopelagic communities were revealed. In late spring, an abundance of crustacean species thought to occur only below 300 meters was detected in ice-covered surface waters. Evident in ice-free waters were the expected occurrence patterns of these normally nonmigratory mesopelagic organisms. Where the pack was consolidated and little light penetrated to depth, primary and secondary production was confined to ice floes, and the physical environment immediately beneath the ice was reminiscent of a mesopelagic one. This suite of characteristics possibly explains why the crustaceans resided at the surface.
    Type: Article , PeerReviewed
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  • 8
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    Oregon Subduction Zone: Venting, Fauna, and Carbonates (1986)
    American Association for the Advancement of Science (AAAS)
    In:  Science, 231 (4738). pp. 561-566.
    Details
    Publication Date: 2019-05-06
    Description: Transects of the submersible Alvin across rock outcrops in the Oregon subduction zone have furnished information on the structural and stratigraphic framework of this accretionary complex. Communities of clams and tube worms, and authigenic carbonate mineral precipitates, are associated with venting sites of cool fluids located on a fault-bend anticline at a water depth of 2036 meters. The distribution of animals and carbonates suggests up-dip migration of fluids from both shallow and deep sources along permeable strata or fault zones within these clastic deposits. Methane is enriched in the water column over one vent site, and carbonate minerals and animal tissues are highly enriched in carbon-12. The animals use methane as an energy and food source in symbiosis with microorganisms. Oxidized methane is also the carbon source for the authigenic carbonates that cement the sediments of the accretionary complex. The animal communities and carbonates observed in the Oregon subduction zone occur in strata as old as 2.0 million years and provide criteria for identifying other localities where modern and ancient accreted deposits have vented methane, hydrocarbons, and other nutrient-bearing fluids.
    Type: Article , PeerReviewed
    Format: text
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