Shear-induced conversion of seismic waves across single fractures

Nakagawa, Seiji; Nihei, Kurt T.; Myer, Larry R.

doi:10.1016/s1365-1609(99)00101-x

Cited by 60 publications

(45 citation statements)

References 23 publications

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“…The effects of single fractures on wave propagation, including P-wave, S-wave and fracture interface wave propagation, have been studied with full consideration of different fracture deformational behaviour [2][3][4][5][6][7][8][9][10][11]. Schoenberg [2] and Pyrak-Nolte et al [5] derived solutions of reflection and transmission coefficients for obliquely incident P-or S-wave (which causes wave conversion at the fracture interface) on a dry or liquid-filled fracture between two dissimilar media.…”

Section: Introductionmentioning

confidence: 99%

“…Schoenberg [2] and Pyrak-Nolte et al [5] derived solutions of reflection and transmission coefficients for obliquely incident P-or S-wave (which causes wave conversion at the fracture interface) on a dry or liquid-filled fracture between two dissimilar media. Nakagawa et al [6] found that wave conversion occurs when P-wave or S-wave is normally incident on a fracture subjected to a shear movement. Meanwhile, Gu et al [7] pointed out that a head wave or an inhomogeneous P-interface wave appears when an SVwave (a S-wave with particle movement in the vertical plane) is incident upon a fracture at or beyond the critical angle, which is determined by the Poisson's ratio of the rock material.…”

Section: Introductionmentioning

confidence: 99%

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UDEC modelling on wave propagation across fractured rock masses

Zhao

Cai³

et al. 2008

Computers and Geotechnics

118

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

UDEC modelling on wave propagation across fractured rock masses

Zhao

Cai³

et al. 2008

Computers and Geotechnics

118

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“…The density function in (10) has the ability to model surfaces with varying roughness. As discussed in [5], the asperity contacts for smooth interfaces have a greater tendency to concentrate in the direction normal to the interface than that for rough interfaces.…”

Section: A Statistical Description Of Interfacementioning

confidence: 99%

3D-2 Application of a Micromechanical Model to Wave Propagation Through Nonlinear Rough Interfaces Under Stress

Misra

Marangos

2006

2006 IEEE Ultrasonics Symposium

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Imperfect interfaces between two rough solids are known to exhibit nonlinear, anisotropic behavior under static normal and shear stresses. We expect this nonlinear, anisotropic behavior to have a profound effect on wave propagation through such interfaces. A micromechanical methodology is applied to explicitly model the initial normal and shear stiffness behavior of interfaces. The calculated initial normal and shear stiffness are used to investigate plane wave propagation behavior through interfaces utilizing the imperfectly bonded interface model

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“…Nakagawa (1998Nakagawa ( , 2000 carried out ultrasonic transmission tests on a fractured granite specimen (figure 1) to investigate the effect of static shear stress applied to the fracture on its seismic response. The granite specimen was subjected to both axial and lateral load, and seismic waves were transmitted perpendicular to the fracture.…”

Section: Seismic Signature Of the Static Shear Stress On A Fracturementioning

confidence: 99%

Seismic monitoring of shear stress on fractures/faults

Toomey¹,

Nakagawa²

2003

SEG Technical Program Expanded Abstracts 2003

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SummaryLaboratory experiments have shown that the static shear stress acting on a fracture displays a distinctive seismic signature. For plane P waves normally incident on a fracture, the application of a static shear stress results in converted, plane S waves. For incident S waves converted P waves are produced. The amplitude and polarity of these converted waves are directly related to the magnitude and direction of the static shear stress acting on the fracture. We use a numerical model to investigate the relationship between converted waves, fracture geometry and in-situ shear stress. This model can capture the response of fractured rocks to both dynamic and quasi-static stresses, allowing 'time-lapse' seismic simulations to be carried out across the fracture during changing stress conditions. Our simulations show that the anomalous scattering of seismic waves from sheared fractures is reproduced in this numerical model, making it an appropriate tool for further investigation of this phenomenon. It is hoped that this research will lead to the development of a quantitative tool for evaluating subsurface shear stress.

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Shear-induced conversion of seismic waves across single fractures

Cited by 60 publications

References 23 publications

UDEC modelling on wave propagation across fractured rock masses

UDEC modelling on wave propagation across fractured rock masses

3D-2 Application of a Micromechanical Model to Wave Propagation Through Nonlinear Rough Interfaces Under Stress

Seismic monitoring of shear stress on fractures/faults

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