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  • 1
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    Shallow High-Resolution Reflection Seismics (1998)
    Elsevier
    In:  Amsterdam, 404 pp., Elsevier, vol. 19, pp. 503, (ISBN 0121341305)
    Details
    Publication Date: 1998
    Keywords: Seismics (controlled source seismology) ; Reflection seismics ; Handbook of geophysics
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    BIBLIOGRAPHY SEISMOLOGY
  • 2
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    Frühe Untersuchungen über seismische Anisotropie (1999)
    In:  DGG Mittlg., Luxembourg, Conseil de l'Europe, vol. 236, no. 4, pp. 16-21, pp. 1484, (ISBN: 0534351875, 2nd edition)
    Details
    Publication Date: 1999
    Keywords: Seismology ; AnisotropyS ; Waves ; Maurycy ; Pius ; Rudzki ; 1862-1916
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    BIBLIOGRAPHY SEISMOLOGY
  • 3
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    Seismic impedance (1983)
    In:  First Break, Luxembourg, Conseil de l'Europe, vol. 236, no. 3-4, pp. 25-32, pp. 1484, (ISBN: 0534351875, 2nd edition)
    Details
    Publication Date: 1983
    Keywords: Impedance ; Seismics (controlled source seismology)
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    BIBLIOGRAPHY SEISMOLOGY
  • 4
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    Vibroseis and related data acquisition methods (1978)
    In:  Dissertation, Berichte, Oslo, Inst. f. Meteorologie und Geophysik der Univ. Frankfurt/Main, vol. C 560, 183 pp., no. 17, pp. 40-48, (ISBN 3-933346-037)
    Details
    Publication Date: 1978
    Keywords: Vibroseis ; Data analysis / ~ processing
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    BIBLIOGRAPHY SEISMOLOGY
  • 5
    Electronic Resource
    Electronic Resource
    A THEOREM CONCERNING ANISOTROPY OF STRATIFIED MEDIA AND ITS SIGNIFICANCE FOR REFLECTION SEISMICS (1956)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 4 (1956), S. 0 
    Details
    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
    Notes: It is proved that horizontally stratified media, the various materials of which do not differ in their Poisson number, can be considered as isotropic for reflections of a small dip when taking into account quasi-longitudinal waves which have to be reckoned with in practice. Approximating the surface of the wave by an ellipsoid would, however, result in considerable errors.Moreover, curves are presented allowing practical calculations for steeper dips to be made.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2478.1956.tb01411.x
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    THE POTENTIAL OF SHEAR-WAVE OBSERVATIONS (1982)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 30 (1982), S. 0 
    Details
    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
    Notes: Shear waves can today be generated and observed, though not with the flexibility and the technical standard of compressional waves, and they can be identified in seismograms by various means. Their potential lies not so much in their lower velocity (corresponding—for the same frequency—to shorter wavelength and higher resolution) but in the fact that they probe the earth with stresses and strains that differ from those of compressional waves. Full utilization of the information potential of shear waves, therefore, requires combined use of P-and S-waves.Complications in the combined use of different wave types should be regarded as opportunities to obtain additional information. A typical example is the observation that the depth of one and the same interface estimated on the bases of P- and SH-reflections, respectively, can differ significantly. This discrepancy may be due to the anisotropy of a finely layered medium. Under favorable circumstances some of the parameters describing this anisotropy can be deduced from the different depth estimates and the curvature of the squared-offset/squared-time representation of the different reflections. Since in anisotropic media vertically polarized shear waves are significantly different from horizontally polarized ones, the combined observation of all three waves opens up additional possibilities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2478.1982.tb01314.x
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  • 7
    Electronic Resource
    Electronic Resource
    THREE-TERM TAYLOR SERIES FOR t2 - x2-CURVES OF P- AND S-WAVES OVER LAYERED TRANSVERSELY ISOTROPIC GROUND (1984)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 32 (1984), S. 0 
    Details
    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
    Notes: The arrival-time curve of a reflection from a horizontal interface, beneath a homogeneous isotropic layer, is a hyperbola in the x - t-domain.If the subsurface is one-dimensionally inhomogeneous (horizontally layered), or if some or all of the layers are transversely isotropic with vertical axis of symmetry, the statement is no longer strictly true, though the arrival-time curves are still hyperbola-like. In the case of transverse isotropy, however, classical interpretation of these curves fails. Interval velocities calculated from t2 - x2-curves do not always approximate vertical velocities and therefore cannot be used to calculate depths of reflectors.To study the relationship between velocities calculated from t2 - x2-curves and the true velocities of a transversely isotropic layer, we approximate t2 - x2-curves over a vertically inhomogeneous transversely isotropic medium by a three-term Taylor series and calculate expressions for these terms as a function of the elastic parameters. It is shown that both inhomogeneity and transverse isotropy affect slope and curvature of t2 - x2-curves. For P-waves the effect of transverse isotropy is that the t2 - x2-curves are convex upwards; for SV-waves the curves are convex downwards. For SH-waves transverse isotropy has no effect on curvature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2478.1984.tb00742.x
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  • 8
    Electronic Resource
    Electronic Resource
    SYSTEMATIC CLASSIFICATION OF LAYER-INDUCED TRANSVERSE ISOTROPY (1981)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 29 (1981), S. 0 
    Details
    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
    Notes: Waves propagating through a sequence of layers that are thin compared with the wavelength show effects of anisotropy: velocity and displacement direction depend on the angle between the plane of layering and the wave normal, and shear waves split up into two distinct types of different velocity. The layered medium can thus be replaced by a transversely isotrophic medium the parameters of which depend on the parameters of the individual constituent layers.A survey of the anisotropy effects possible in such a medium is generally done by varying the layer parameters in order to obtain different replacement media. This approach guarantees that the replacement medium is realistic, but it does not guarantee adequate sampling of the set of replacement media. To this end one has to begin by selecting the replacement media and then check whether the chosen media possess stable (and eventually realistic) representations by layer sequences. In general, there is an infinite number of layer representations for any transversely isotropic medium that can at all be represented. However, if one restricts the solutions to those requiring the minimal number of layers and the minimum number of different layer parameters, the set of solutions has only one free parameter (i.e., it is a one-dimensional manifold), and an important subset even has a unique solution. A simple algorithm exists for the determination of these “simplest representations”.Aside from sampling the set of representable transversely isotropic media for survey purposes, the method can be applied to the problem of determining the cause of observed anisotropy effects (or lateral changes in such effects). If this method can be applied to real data, it would for instance allow to determine changes in relative thickness or lithology on a scale smaller than the limit of resolution of the seismic method.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2478.1981.tb00695.x
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  • 9
    Electronic Resource
    Electronic Resource
    REFRACTION SEISMICS WITH AN ANISOTROPIC OVERBURDEN: A GRAPHICAL METHOD OF INTERPRETATION (1964)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 12 (1964), S. 0 
    Details
    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
    Notes: An analytical expression for the time-distance curve of seismic waves travelling in a medium consisting of intrinsically anisotropic layers with arbitrarily dipping plane interfaces can be given in terms of the “co-ordinates” of the interfaces (length h of the perpendicular from the shotpoint to the interface, strike ν and dip α of the interface) if for each layer the velocity is given as a function of the orientation of the wave normal. The interpretation of the time-distance curve is understood as the inverse process, namely finding an expression for the co-ordinates in terms of some characteristics of the time-distance curve, e.g. intercept times and apparent velocities. In addition, it is useful to know where the “limiting ray”, which is the ray connecting shotpoint and last geophone, enters and leaves a specific layer, for it is only on the medium between these two points that information can be obtained by interpretation. As ray and wave normal do not generally coincide in anisotropic media, the location of these points cannot be calculated from the co-ordinates and the direction of the wave normal without recourse to the functional dependence between the directions of ray and wave normal.An analytical solution of this problem would involve the solution of a number of equations, implicitly containing several parameters. Successive approximation would be rather cumbersome. Instead, a graphical method is proposed which yields all pertinent information without calculation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2478.1964.tb01912.x
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  • 10
    Electronic Resource
    Electronic Resource
    DIE AUSBREITUNG ELASTISCHER WELLEN IN ANISOTROPEN MEDIEN (1956)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 4 (1956), S. 0 
    Details
    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
    Notes: In seismic underground surveys carried out by Seismos GmbH in siderite mines of Siegerland (Germany) anomalies in velocities have been found which could be explained only by the assumption of slates being aeolotropic. In this paper some of the peculiarities connected with the propagation of elastic waves in aeolotropic media–especially those consisting of thin beds of isotropic material–are discussed. Schlieren-pictures of wave-fronts are presented, which show the validity of the theory.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2478.1956.tb01397.x
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