Sensitivity of Seismic Attenuation and Phase Velocity to Intrinsic Background Anisotropy in Fractured Porous Rocks: A Numerical Study

2017 ◽  
Vol 122 (10) ◽  
pp. 8181-8199 ◽  
Author(s):  
Nicolás D. Barbosa ◽  
J. Germán Rubino ◽  
Eva Caspari ◽  
Klaus Holliger
Keyword(s):  
Phase Velocity ◽  
Numerical Study ◽  
Seismic Attenuation ◽  
Porous Rocks ◽  
Intrinsic Background

scholarly journals Including poroelastic effects in the linear slip theory

Geophysics ◽  
2015 ◽  
Vol 80 (2) ◽  
pp. A51-A56 ◽  
Author(s):  
J. Germán Rubino ◽  
Gabriel A. Castromán ◽  
Tobias M. Müller ◽  
Leonardo B. Monachesi ◽  
Fabio I. Zyserman ◽  
...  
Keyword(s):  
Viscous Friction ◽  
Seismic Wave Propagation ◽  
Seismic Attenuation ◽  
Porous Rocks ◽  
Compliance Matrix ◽  
Frequency Dependent ◽  
Attenuation Mechanism ◽  
Wave Induced ◽  
Complex Valued ◽  
Good Agreement

Numerical simulations of seismic wave propagation in fractured media are often performed in the framework of the linear slip theory (LST). Therein, fractures are represented as interfaces and their mechanical properties are characterized through a compliance matrix. This theory has been extended to account for energy dissipation due to viscous friction within fluid-filled fractures by using complex-valued frequency-dependent compliances. This is, however, not fully adequate for fractured porous rocks in which wave-induced fluid flow (WIFF) between fractures and host rock constitutes a predominant seismic attenuation mechanism. In this letter, we develop an approach to incorporate WIFF effects directly into the LST for a 1D system via a complex-valued, frequency-dependent fracture compliance. The methodology is validated for a medium permeated by regularly distributed planar fractures, for which an analytical expression for the complex-valued normal compliance is determined in the framework of quasistatic poroelasticity. There is good agreement between synthetic seismograms generated using the proposed recipe and those obtained from comprehensive, but computationally demanding, poroelastic simulations.

Lower-hybrid instability in current-carrying plasmas

1982 ◽  
Vol 28 (3) ◽  
pp. 527-537 ◽  
Author(s):  
Joseph E. Willett ◽  
Hassan Mehdian
Keyword(s):  
Phase Velocity ◽  
Drift Velocity ◽  
Numerical Study ◽  
Electron Drift Velocity ◽  
Lower Hybrid ◽  
Electron Drift ◽  
Plasma Parameters ◽  
The Stability ◽  
Hybrid Waves ◽  
Lower Hybrid Waves

The stability of lower-hybrid waves in a collisional, fully ionized plasma carrying a field-aligned current is investigated. From the two-fluid equations in the cold-plasma approximation, a generalized dispersion relation and formulae for the real frequency ωI and growth rate ωR are derived. The results of a numerical study are presented showing the dependence of ωR and ωI on the angle between the direction of propagation and the magnetic field, the ratio of the electron drift velocity to the parallel phase velocity, and other plasma parameters. Lower-hybrid instability with electron drift velocity small compared with the parallel phase velocity is predicted.

scholarly journals Numerical study of the stress field during crack growth in porous rocks

2015 ◽  
Vol 1 (3-4) ◽  
pp. 91-101 ◽  
Author(s):  
Yongming Yang ◽  
Yang Ju ◽  
Yeheng Sun ◽  
Dongxiao Zhang
Keyword(s):  
Stress Field ◽  
Crack Growth ◽  
Numerical Study ◽  
Porous Rocks

Seismic Attenuation in Partially Saturated Porous Rocks

2013 ◽  
Author(s):  
E. Caspari ◽  
Q. Qi ◽  
J.G. Rubino ◽  
S.C. Lopes ◽  
M. Lebedev ◽  
...  
Keyword(s):  
Seismic Attenuation ◽  
Porous Rocks ◽  
Partially Saturated
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