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  • 111-504B; DRILL; Drilling/drill rig; Joides Resolution; Leg111; North Pacific Ocean; Ocean Drilling Program; ODP  (1)
  • velocity surfaces
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  • 1
    Electronic Resource
    Electronic Resource
    Elastic constants and velocity surfaces of indurated anisotropic shales (1994)
    Springer
    Surveys in geophysics 15 (1994), S. 481-494 
    Details
    ISSN: 1573-0956
    Keywords: Vp ; vs ; laboratory ; anisotropy ; shales ; elastic constants ; velocity surfaces
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The velocities of two Devonian-Mississippian shales have been measured to confining pressures of 200 MPa in a laboratory study of anisotropy and wave propagation. Both samples were found to be transversely isotropic at elevated pressures with the main symmetry axis perpendicular to bedding. The elastic constants of the shales were used to calculate phase and group velocity surfaces as a function of angle to the bedding normal. Multiple velocity measurements in non-symmetry directions, not undertaken in previously published studies of shales, have been used to confirm features observed on calculated velocity surfaces. It is demonstrated that velocities measured in non-symmetry directions are phase velocities. Group velocities were found to be significantly lower than the corresponding phase velocities of the shales due to their high anisotropies. Shear wave splitting was found to be negligible for propagation directions within approximately 30° of the bedding normals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00690171
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    Paper (German National Licenses)
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  • 2
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    Seismic properties of sheeted dikes from ODP Hole 111-504B (1989)
    PANGAEA
    In:  Supplement to: Christensen, Nikolas I; Wepfer, William W; Baud, R D (1989): Seismic properties of sheeted dikes from Hole 504B, ODP Leg 111. In: Becker, K; Sakai, H; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 111, 171-176, https://doi.org/10.2973/odp.proc.sr.111.153.1989
    Details
    Publication Date: 2024-01-09
    Description: Seismic velocities have been measured at confining pressures to 600 MPa for eight samples of sheeted dike rock obtained from Hole 504B during Leg ODP 111. The compressional- and shear-wave velocities are, in general, higher than the velocities measured in overlying dike rocks obtained from the hole during DSDP Leg 83. The velocity gradients observed in Layer 2C result from decreasing porosity with depth and increasing metamorphic grade. The laboratory-measured velocities of the Leg 111 dike rocks are similar to those of dike rocks reported for the Bay of Islands, Samail, and Troodos ophiolites.
    Keywords: 111-504B; DRILL; Drilling/drill rig; Joides Resolution; Leg111; North Pacific Ocean; Ocean Drilling Program; ODP
    Type: Dataset
    Format: application/zip, 2 datasets
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