Results 221 to 230 of about 2,181 (263)

Wave modeling in viscoacoustic media with transverse isotropy

Geophysics, 2019
ABSTRACT We have developed a derivation of a system of equations for acoustic waves in a medium with transverse isotropy (TI) in velocity and attenuation. The equations are derived from Cauchy’s equation of motion, and the constitutive law is Hooke’s generalized law.
Nuno V. da Silva, Gang Yao, Michael Warner   +2 more
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An Extended Exponentiated Hencky Energy for Transverse Isotropy

PAMM, 2018
AbstractIn this contribution we aim to formally extend the promising exponentiated Hencky strain‐energy to transversely isotropic problems. This is facilitated by using additional anisotropic logarithmic strain invariants. The potential of the logarithmic‐strain driven material response is studied for a numerical example associated to arterial wall ...
Hoegen, Markus Von, Schröder, Jörg, Neff, Patrizio   +2 more
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Effect of transverse isotropy on dip‐moveout processing

SEG Technical Program Expanded Abstracts 1994, 1994
The usual dip moveout (DMO) algorithms are based on the assumption of an isotropic medium. However, the earth’s sedimentary basins are often described as transversely isotropic. We investigated the effect of transverse isotropy on a data processing sequence that includes isotropic DMO. Two geometrically similar physical models were constructed. One was
Kathy K. Roldan, Alfonso Gonzales, Dan A. Ebrom   +2 more
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Torsional Stress Interference in Transverse Isotropy

Journal of Engineering Mechanics, 1991
An unbounded homogeneous transversely isotropic body of revolution containing two twin spheroidal cavities is subjected to a torsional loading at infinity. The axis of twist coincides with the axis of elastic symmetry of the material and the axis of revolution of the body.
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Nonhyperbolic reflection moveout for horizontal transverse isotropy

SEG Technical Program Expanded Abstracts 1996, 1996
Abstract The transversely isotropic model with a horizontal axis of symmetry (HTI) has been used extensively in studies of shear-wave splitting to describe fractured formations with a single system of parallel vertical penny-shaped cracks.
Abdulfattah Al-Dajani, Ilya Tsvankin
openaire   +1 more source

Inversion technique for transverse isotropy with a tilted symmetry axis

Exploration Geophysics, 2000
Computer simulation experiments and numerical modelling studies have been used to recover the P-wave anisotropic elastic parameters for transversely isotropic media with a tilted symmetry axis (TTI media). These parameters include P-wave velocity along the axis of symmetry α0, S-wave velocity along the axis of symmetry s0, the P-wave anisotropy e, and ...
Ruiping Li, Patrick Okoye, Norm Uren
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Converted-Wave Moveout and Parameter Estimation for Transverse Isotropy

61st EAGE Conference and Exhibition, 1999
For transverse isotropy with a vertical symmetry axis (TIV, or polar anisotropy), it is difficult to obtain the vertical velocities and build a velocity-depth model from reflection data, without borehole or log information.
X. -Y. Li, J. Yuan
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SYSTEMATIC CLASSIFICATION OF LAYER‐INDUCED TRANSVERSE ISOTROPY*

Geophysical Prospecting, 1981
AbstractWaves 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.
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On the General Solution for Piezothermoelasticity for Transverse Isotropy With Application

Journal of Applied Mechanics, 2000
This paper derives a general solution of the three-dimensional equations of transversely isotropic piezothermoelastic materials (crystal class, 6 mm). Two displacement functions are first introduced to simplify the basic equations and a general solution is then derived using the operator theory.
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Intrinsic and layer-induced vertical transverse isotropy

Geophysics, 2003
Abstract Anisotropy caused by fine layering is often considered responsible for the differences between velocities obtained in sonic-log and seismic experiments. Understanding the link between the two is critical, especially in the current era of most wells being (highly) deviated.
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