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  • Other Sources  (8)
  • Society of Exploration Geophysicists  (6)
  • Alfred Wegener Institute for Polar and Marine Research & German Society of Polar Research
  • American Institute of Physics (AIP)
  • Nature Publishing Group
  • 2005-2009
  • 1985-1989  (8)
  • 1950-1954
  • 1986  (8)
Collection
Source
Keywords
Publisher
Years
  • 2005-2009
  • 1985-1989  (8)
  • 1950-1954
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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    PAPER (OCEANREP)
  • 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
    Format: text
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  • 7
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    Palaeoceanography: Biomarkers for ancient climates (1986)
    Nature Publishing Group
    In:  Nature, 320 (6058). pp. 107-108.
    Details
    Publication Date: 2016-03-01
    Type: Article , PeerReviewed
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  • 8
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    A Lagrangian mixed layer model of Atlantic 18 C water formation (1986)
    Nature Publishing Group
    In:  Nature, 319 . pp. 574-576.
    Details
    Publication Date: 2019-01-21
    Description: One of the most striking features of the upper North Atlantic Ocean is an extensive layer of water with temperature close to 18°C and salinity close to 36.5‰, (ref. 1). This 18°C water is formed by winter convection in the Sargasso sea2,3, but aspects of the annual rate of 18°C water formation remain obscure4. We have simulated this water mass formation by integrating a one-dimensional model along a 4-yr trajectory of a water column circulating around the Sargasso Sea. Winter convection is deep (≥200 m) in regions where the ocean suffers a net annual heat loss to the atmosphere, and shallow (≤lOOm) where the ocean gains heat each year. The origin of the thermostad (nearly isothermal layer) is a thick layer of nearly homogeneous water subducted beneath the seasonal boundary layer in the year that the water column passes through the line dividing annual cooling from annual heating. We estimate the annual production of 18°C water to be 446,000 km3 yr−1. Downstream, more stratified central water is formed each year at a rate that depends more on Ekman pumping (wind-forced convergence) than on the decreasing depth of winter convection
    Type: Article , PeerReviewed
    Format: text
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