Three-dimensional elastic scattering by near-surface heterogeneities

Riyanti, C.D.; Herman, Gérard C.

doi:10.1111/j.1365-246x.2005.02492.x

Cited by 11 publications

(20 citation statements)

References 28 publications

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“…To solve the former problem, a cosine taper is applied to the elements of the Green's tensor by considering the value of p max . Riyanti & Herman (2005) solved this problem by subtracting the free‐space Green's tensor elements from the Green's tensor elements. When choosing the value of sampling the fastest oscillating case of the integrand is taken into account.…”

Section: Formulation Of the Forward Problemmentioning

confidence: 99%

“…These papers focused on detecting the object but not determining the actual contrast values of the inhomogeneities. Riyanti & Herman (2005) present a solution to the 3‐D elastodynamic forward problem in a layered embedding medium including the effect of multiple scattering. It is an accurate solution of the wave equation, however it is quite compute expensive.…”

Section: Introductionmentioning

confidence: 99%

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Inverse scattering of surface waves: imaging of near-surface heterogeneities

Kaslilar

2007

Geophysical Journal International

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S U M M A R YAn efficient inverse scattering method is developed for imaging near-surface heterogeneities using scattered surface waves. Three dimensional elastodynamic wave propagation and scattering in a laterally invariant embedding medium is considered. The Born Approximation is used and the scattered wavefield is expressed as a domain type integral representation. The computation time of Green's tensor elements is reduced by considering the radial symmetry of the medium. The method is validated by numerical tests. Ultrasonic laboratory data obtained from a scale model experiment are used for imaging the near-surface inhomogeneities caused by an epoxy-filled hole in the surface of an aluminum block. Both synthetic and the scale model tests show that the location, the actual density contrast and the depth of the inhomogeneities are reasonably well estimated.

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Section: Formulation Of the Forward Problemmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Inverse scattering of surface waves: imaging of near-surface heterogeneities

Kaslilar

2007

Geophysical Journal International

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“…Campman et al (2005Campman et al ( , 2006 use an inverse scattering approach based on an integral-equation formulation to image the near-surface heterogeneities, but they assume that scattering takes place immediately under the receivers. Other methods, based on solving integral equations using the method of moments, can handle strong contrast and large heterogeneities and can take into account multiple scattering (Riyanti and Herman, 2005;Campman and Riyanti, 2007). However, these methods are restricted to laterally homogeneous background media consisting of horizontal layers.…”

Section: Introductionmentioning

confidence: 99%

Imaging of near-surface heterogeneities by scattered elastic waves

Almuhaidib

Toksöz

2015

GEOPHYSICS

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We have developed an elastic reverse time migration (RTM) approach for imaging near-surface heterogeneities, such as karst features, using scattered waves (e.g., body to P-, S-, and surface waves). Knowledge of location and strength of the scatterers helps in seismic imaging, survey planning, and geotechnical site characterization. To model seismic wave propagation for RTM, we use an elastic staggered-grid finite-difference scheme. The scattered body-tosurface waves provide optimal illumination and wavenumber coverage of the near surface as they travel horizontally along the free surface. We tested the elastic RTM approach on synthetic data simulated using a finite-difference solver and found it to be robust.

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“…Direct surface-wave (Rayleigh-wave) scattering has been extensively studied in numerous previous studies (e.g., De Bremaecker, 1958;Knopoff and Gangi, 1960;Fuyuki and Matsumoto, 1980;Gélis et al, 2005). In exploration seismology, however, much less research has been done on the effects of near-surface heterogeneities on the upcoming reflections (Campman et al, 2005(Campman et al, , 2006Riyanti and Herman, 2005), especially in realistic cases of more complicated scatterers and background media. Therefore, the emphasis of this paper is more on the scattering of upcoming body waves.…”

Section: Introductionmentioning

confidence: 99%

“…Herman et al (2000) and Campman et al (2005Campman et al ( , 2006 image and suppress near-receiver scattered surface waves assuming that scattering takes place immediately under the receivers. Other methods based on solving integral equations using the method of moments can take into account multiple scattering and can handle strong contrast and large heterogeneities (Riyanti and Herman, 2005;Campman and Riyanti, 2007). However, these methods are limited to laterally homogeneous embedding consisting of horizontal layers.…”

Section: Introductionmentioning

confidence: 99%

Numerical modeling of elastic wave scattering by near-surface heterogeneities

Almuhaidib¹,

Toksöz²

2013

SEG Technical Program Expanded Abstracts 2013

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In land seismic data, scattering from surface and near-surface heterogeneities adds complexity to the recorded signal and masks weak primary reflections. To understand the effects of near-surface heterogeneities on seismic reflections, we simulated seismic-wave scattering from arbitrary-shaped, shallow, subsurface heterogeneities through the use of a perturbation method for elastic waves and finite-difference forward modeling. The near-surface scattered wavefield was modeled by looking at the difference between the calculated incident (i.e., in the absence of scatterers) and the total wavefields. Wave propagation was simulated for several earth models with different nearsurface characteristics to isolate and quantify the influence of scattering on the quality of the seismic signal. The results indicated that the direct surface waves and the upgoing reflections were scattered by the near-surface heterogeneities. The scattering took place from body waves to surface waves and from surface waves to body waves. The scattered waves consisted mostly of body waves scattered to surface waves and were, generally, as large as, or larger than, the reflections. They often obscured weak primary reflections and could severely degrade the image quality. The results indicated that the scattered energy depended strongly on the properties of the shallow scatterers and increased with increasing impedance contrast, increasing size of the scatterers relative to the incident wavelength, decreasing depth of the scatterers, and increasing attenuation factor of the background medium. Also, sources deployed at depth generated weak surface waves, whereas deep receivers recorded weak surface and scattered body-to-surface waves. The analysis and quantified results helped in the understanding of the scattering mechanisms and, therefore, could lead to developing new acquisition and processing techniques to reduce the scattered surface wave and enhance the quality of the seismic image.

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Three-dimensional elastic scattering by near-surface heterogeneities

Cited by 11 publications

References 28 publications

Inverse scattering of surface waves: imaging of near-surface heterogeneities

Inverse scattering of surface waves: imaging of near-surface heterogeneities

Imaging of near-surface heterogeneities by scattered elastic waves

Numerical modeling of elastic wave scattering by near-surface heterogeneities

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