A review of the wave gradiometry method for seismic imaging

Liang, Chuntao; Cao, Feihuang; Liu, Zhijin; Chang, Y. H.

doi:10.1016/j.eqs.2023.04.002

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2024

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Cited by 3 publications

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Decoupled anisotropy in the lower crust and upper mantle extracted by the Wave Gradiometry method resolves the differential deformation mechanisms beneath the northeastern Tibetan Plateau

Dai,

Liang,

Cao

et al. 2024

Earth and Planetary Science Letters

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Decoupled anisotropy in the lower crust and upper mantle extracted by the Wave Gradiometry method resolves the differential deformation mechanisms beneath the northeastern Tibetan Plateau

Dai,

Liang,

Cao

et al. 2024

Earth and Planetary Science Letters

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On seismic gradiometric wave equation inversion for density

Faber,

Curtis

2024

Geophysical Journal International

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Summary Material density remains poorly constrained in seismic imaging problems, yet knowledge of density would provide important insight into physical material properties for the interpretation of subsurface structures. We test ambient noise wavefield sensitivities to subsurface density contrasts through spatial and temporal wavefield gradients via Wave Equation Inversion (WEI), a form of seismic gradiometry. Synthetic results for 3D acoustic media suggest that it is possible to estimate relative density structure with WEI by using a full acoustic formulation for wave propagation and gradiometry. We show that imposing a constant density assumption on the medium can be detrimental to subsurface velocity images, whereas the full acoustic formulation assuming variable density improves our knowledge of both material properties. It allows us to estimate density as an additional material parameter, as well as to improve phase velocity estimates by accounting for approximations to the density structure. In 3D elastic media, severe approximations in the governing wave physics are necessary in order to invert for density using only an array of receivers on the free surface. It is then not straightforward to isolate the comparatively weak density signal from the influence of phase velocity using gradiometric WEI. However, by using receivers both at the surface and in the shallow subsurface we show that it is possible to estimate density using fully elastic volumetric WEI.

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Adaptable System for Protecting Inhabitants

Ciufudean,

Buzduga

2024

2024 International Conference on Emerging Smart Computing and Informatics (ESCI)

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A review of the wave gradiometry method for seismic imaging

Cited by 3 publications

References 59 publications

Decoupled anisotropy in the lower crust and upper mantle extracted by the Wave Gradiometry method resolves the differential deformation mechanisms beneath the northeastern Tibetan Plateau

Decoupled anisotropy in the lower crust and upper mantle extracted by the Wave Gradiometry method resolves the differential deformation mechanisms beneath the northeastern Tibetan Plateau

On seismic gradiometric wave equation inversion for density

Adaptable System for Protecting Inhabitants

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