Multi-component seismic surveying for near surface investigations: examples from central Wyoming and southern England

Bates, C. Richard; Phillips, Dawn R.

doi:10.1016/s0926-9851(99)00017-8

Cited by 12 publications

(2 citation statements)

References 21 publications

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“…In all rock types, anisotropy results from structural weaknesses, commonly manifested as aligned open fractures, while in sedimentary rocks, additional anisotropy can result from rock fabric such as mineral or grain particle alignment and layering. Both forms of anisotropy can have significant implications not only for the strength of a material but also for passage of fluids through it (Bates and Phillips, 2000).…”

Section: Introductionmentioning

confidence: 99%

“…In the upper mantle, the so-called 'Love-Rayleigh discrepancy' arises where Love and Rayleigh wave travel times cannot be fitted with a single, isotropic model, indicating anisotropy of up to a few percent (Gaherty, 2004). In shallow sediments, differences between V SH and V SV in excess of 10% have been measured using a source at the surface and borehole detectors (Bates and Phillips, 2000).…”

Section: Introductionmentioning

confidence: 99%

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Applications of Love Wave Dispersion for Improved Shear-wave Velocity Imaging

Safani

O’Neill

Matsuoka

et al. 2005

JEEG

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Love wave dispersion and associated analytic partial derivatives are theoretically derived using the reflection/transmission (R/T) method. The numerical implementation is then applied to linearised inversion of synthetic and field data. For simple cases dominated by the fundamental mode, Love wave sensitivity and inversion stability is higher than the Rayleigh wave dispersion. However, in general, Rayleigh wave inversion converges more rapidly than Love waves, although similar low misfits can be achieved. When assumed interfaces are used, the inversion of fundamental-mode Love wave dispersion of the normally dispersive profile provides a more accurate result, because the Love wave dispersion is independent of the Poisson's ratio. In more realistic, irregularly dispersive profiles, deep structure is only interpreted using higher-mode Love and Rayleigh wave dispersion.A field test over a shallow geologic fault with coincident Love and Rayleigh wavefields shows the fundamental-mode Love wave dispersion above 20 Hz to have at least 10% higher phase velocities than Rayleigh waves. However, at lower frequencies, Love wave dispersion is at least 10% slower. The resulting inverted models show up to 25% difference in shear-wave velocity. This is attributed to transverse isotropy of V SH and V SV in shallow fluvial sediments and allows improved geological horizon interpretation and soil discrimination over conventional, single-component surface wave inversion. A second test at a seismograph station site shows the Love wavefield less scattered and mode identification is simple, unlike Rayleigh waves over the same line, and the inversion results correlate well to downhole shear-wave velocity logs.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%