MuSaWa: Multi-Scale S-wave Tomography for Exploration and Risk Assessment of Development Sites

Paasche, Hendrik; Rumpf, M.; Lontsi, Agostiny Marrios; Hausmann, J.; Hannemann, Katrin; Fechner, Thomas; Ohrnberger, Matthias; Werban, Ulrike; Tronicke, Jens; Dietrich, P.

doi:10.1007/978-3-319-04205-3_6

Cited by 3 publications

(1 citation statement)

References 22 publications

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“…Currently, P‐wave tomography is employed more frequently than S‐wave borehole tomographic surveys (Paasche et al . ). Examples of S‐wave borehole tomography include a survey to derive geotechnical elastic properties (Angioni et al .…”

Section: Introductionmentioning

confidence: 97%

Joint inversion of cross‐borehole P‐waves, horizontally and vertically polarized S‐waves: tomographic data for hydro‐geophysical site characterization

Ketelhodt

Fechner²,

Manzi

et al. 2018

Near Surface Geophysics

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P‐wave, as well as horizontally and vertically polarized S‐wave, tomographic data were collected between two borehole pairs. This enabled the joint‐inversion of the three datasets. By employing structural constraints, the S‐wave traveltimes were coupled to the more accurate P‐wave traveltimes during the inversion. Thereby, the traveltime and anisotropic artefacts, initially observed in the individually inverted S‐wave tomograms, were significantly reduced and the correlation with the borehole logs improved, while the resolution of the jointly inverted P‐wave tomogram was only marginally affected. The joint inversion proves successful in determining the S‐wave velocity distribution more accurately than individual inversions. In addition, the jointly inverted tomograms were used to detect aquifer heterogeneities, caused by differences in clay content, and to distinguish areas of relatively high effective pressure. Comparison of the jointly inverted S‐wave tomograms suggests the effect of S‐wave anisotropy, which showed substantial velocity differences of approximately −10% to +10%. The anisotropy may have been caused by the presence of water‐filled pores, micro‐cracks and preferred mineral alignment (mainly clay) in the media.

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Section: Introductionmentioning

confidence: 97%

Joint inversion of cross‐borehole P‐waves, horizontally and vertically polarized S‐waves: tomographic data for hydro‐geophysical site characterization

Ketelhodt

Fechner²,

Manzi

et al. 2018

Near Surface Geophysics

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Geophysical Application for Splines

Singh

Zaynidinov

2018

Signal Processing Applications Using Multidimensional Polynomial Splines

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Elastic Parameters from Compressional and Shear Wave Tomographic Survey: A Case Study from Kuala Lumpur, Malaysia

Ketelhodt

Fechner²,

Manzi

et al. 2017

JEEG

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An integrated P- and S-wave cross-borehole tomographic survey was performed in the city center of Kuala Lumpur, Malaysia, with the aim of exploring a karstic limestone area near an area that previously encountered cavities. Horizontally polarized shear waves were generated with two opposing, perpendicular strike directions and recorded with a multi-level, three-component receiver array. This allowed a high quality picking of the traveltimes, whereby the wave train reverses at the time of the S-wave arrival. In addition, high quality sparker generated P-waves were recorded. The P- and S-wave traveltimes were used to invert for two co-located tomograms. These tomograms enabled a better interpretation capability than a P- or S-wave tomogram on its own. The tomograms enabled the calculation of the elastic parameters, i.e., P- to S-wave velocity (Vp/Vs) ratio, Poisson's ratio, bulk modulus, Young's modulus and the shear modulus, on a 2D surface between the boreholes. This further aided the interpretation, as areas with limited traveltime accuracy and thus, an increase in tomographic error, could be easily identified, and the extent of a large cavity could be estimated. The interpretation of the tomograms was constrained by two additional boreholes, which provided more confidence on the delineation and location of cavities at depths. The survey shows the benefit of co-locating P- and S-wave tomography surveys.

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MuSaWa: Multi-Scale S-wave Tomography for Exploration and Risk Assessment of Development Sites

Cited by 3 publications

References 22 publications

Joint inversion of cross‐borehole P‐waves, horizontally and vertically polarized S‐waves: tomographic data for hydro‐geophysical site characterization

Joint inversion of cross‐borehole P‐waves, horizontally and vertically polarized S‐waves: tomographic data for hydro‐geophysical site characterization

Geophysical Application for Splines

Elastic Parameters from Compressional and Shear Wave Tomographic Survey: A Case Study from Kuala Lumpur, Malaysia

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