Dispersion effect of velocities on the evaluation of material elasticity
ABSTRACT The author employs the Kjartansson absorption model to prove that intrinsic dispersion of seismic wave velocities in absorbing
media is a basic factor responsible for the differences between elastic rock parameters measured dynamically and statically.
Dispersion of Young’s modulus predicted by this model for a frequency range from millihertz to tens of kilohertz matches well
the experimental data obtained for polyvinyl chloride plastic used as a test material in the study case.
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ABSTRACT: Thesis--Stanford University. Includes bibliographical references.
Article: Dynamic and static moduli[Show abstract] [Hide abstract]
ABSTRACT: Static and dynamic bulk moduli (K/sub s/ and K/sub d/) are measured as continuous functions of pressure from zero to 2--3 kilobars for two sandstones, a tuff, limestone, granite, and oil shale. Results for the sandstones and granite are in good agreement with previously reported data with K/sub s//K/sub d/ varying from about 0.5 at atmospheric pressure to close to unity at pressures 2 kilobars and above. For rocks behaving elastically under static loading, the K/sub s//K/sub d/ ratio is inversely related to the microcrack density. For the limestone, time dependent deformation associated with pore collapse results in K/sub s//K/sub d/ ratios approaching 0.1 at high pressure. Upon unloading, while initially high (approx.1.0) at high pressures, K/sub s//K/sub d/ becomes lower than values obtained during loading at low pressures (Geophysical Research Letters 01/1981; 8(1). DOI:10.1029/GL008i001p00039 · 4.46 Impact Factor
- Geophysics 08/1965; 30. DOI:10.1190/1.1439620 · 1.76 Impact Factor