Elastic wave radiation from a high frequency finite-length transducer

2006 ◽  
Vol 298 (1-2) ◽  
pp. 108-131 ◽  
Author(s):  
G.W. Owen ◽  
I.D. Abrahams
Keyword(s):  
Elastic Wave ◽  
Finite Length ◽  
High Frequency ◽  
Wave Radiation

Effect of an elastically restrained boundary on SV-wave radiation patterns

1968 ◽  
Vol 58 (2) ◽  
pp. 497-520
Author(s):  
Y. T. Huang
Keyword(s):  
Boundary Condition ◽  
Wave Propagation ◽  
Free Boundary ◽  
Boundary Conditions ◽  
Elastic Wave ◽  
Solid Earth ◽  
Elastic Constants ◽  
Wave Radiation ◽  
Free Boundary Conditions ◽  
Elastically Restrained

Abstract In the solution of elastic wave propagation equations applied to solid earth, it is customarily assumed that free boundary conditions are satisfied at a surface which is in contact with the atmosphere. Situations which depart from this boundary condition have now been studied for arbitrary combinations of the Lamé elastic constants. The solutions are given for a homogeneous, isotropic half space.

Effect of Low Elastic Wave Radiation on Fluid Percolation Through Fractured Media

2011 ◽  
Author(s):  
I. Najafi ◽  
B. Keshavarzi ◽  
R. Karimi ◽  
M. H. Ghazanfari ◽  
M. Amani
Keyword(s):  
Elastic Wave ◽  
Fractured Media ◽  
Wave Radiation

An Equivalent Two-Port Model for a Transmission Line of Finite Length Accounting for High-Frequency Effects

2014 ◽  
Vol 56 (6) ◽  
pp. 1657-1665 ◽  
Author(s):  
Massimo Brignone ◽  
Federico Delfino ◽  
Renato Procopio ◽  
Mansueto Rossi
Keyword(s):  
Transmission Line ◽  
Finite Length ◽  
High Frequency ◽  
Frequency Effects ◽  
High Frequency Effects

The influence of pore fluids and frequency on apparent effective stress behavior of seismic velocities

Geophysics ◽  
2010 ◽  
Vol 75 (1) ◽  
pp. N1-N7 ◽  
Author(s):  
Gary Mavko ◽  
Tiziana Vanorio
Keyword(s):  
Elastic Wave ◽  
Bulk Modulus ◽  
Effective Stress ◽  
High Frequency ◽  
Laboratory Data ◽  
Pore Fluids ◽  
Wave Velocities ◽  
Stress Behavior ◽  
Stress Coefficient ◽  
The Impact

Although poroelastic theory predicts that the effective stress coefficient equals unity for elastic moduli in monomineralic rocks, some rock elastic wave velocities measured at ultrasonic frequencies have effective stress coefficients less than one. Laboratory effective stress behavior for P-waves is often different than S-waves. Furthermore, laboratory ultrasonic velocities almost always reflect high-frequency artifacts associated with pore fluids, including an increase in velocities and flattening of velocity-versus-pressure curves. We have investigated the impact of pore fluids and frequency on the observed effective stress coefficient for elastic wave velocities by developing a model that calculates pore-fluid effects on velocity, including high-frequency squirt dispersion, and we have compared the model’s predictions with laboratory data. We modeled a rock frame with penny-shaped cracks for three situations: vacuum dry, saturated with helium, and saturated with brine. Even if the frame modulus depends only on the differential stress, the saturated-rock effective stress coefficient is predicted to be significantly less than one at ultrasonic frequencies because of two effects: an increase in the fluid bulk modulus with increasing pressure and the contribution of high-frequency squirt dispersion. The latter effect is most significant in soft fluids (helium in this experiment) in which the fluid-bulk modulus is less than or comparable to the thin-crack pore stiffness.

High Frequency Elastic Wave Propagation in Media with a Microstructure

2010 ◽  
Author(s):  
B. Tie ◽  
D. Aubry ◽  
A.-S. Mouronval ◽  
D. Solas ◽  
J. Thébault ◽  
...  
Keyword(s):  
Wave Propagation ◽  
Elastic Wave ◽  
High Frequency ◽  
Elastic Wave Propagation
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