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Journal of Geophysical Research Atmospheres
Article . 1997 . Peer-reviewed
License: Wiley Online Library User Agreement
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Diffraction tomography using multimode surface waves

Authors: T. Meier; S. Lebedev; G. Nolet; F. A. Dahlen;

Diffraction tomography using multimode surface waves

Abstract

A new method is described that makes it feasible to include scattered and converted surface waves into waveform inversions for the three‐dimensional (3‐D) structure of the Earth. The single scattering (Born) approximation forms the basis of the method. In order to minimize the amplitude of the scattered wave field, the background model is first adapted to correct for nonconverted, forward‐scattered wave energy. We then perform Born inversion of the difference between the measured and synthetic waveforms, including a suite of Love and Rayleigh modes. The Born approximation yields linear equations of the form Aδγ=δuBorn, which allow the determination of the three‐dimensional perturbations γ to the background model from the scattered wave field δuBorn. This procedure is followed separately for each source‐receiver pair to allow for optimized background models for each signal, as well as to minimize the computational burden. We winnow the data vector for each path by performing singular value decomposition using a diagonalization of AAT. In a realistic example we found that each vertical component seismogram yields 30–40 linear constraints on the 3‐D Earth, significantly more than with conventional pure‐path (WKBJ) inversions. In a synthetic test, one seismogram is shown to be able to image a simple model of a point scatterer off the great circle. As a spin‐off of the formulation of the multimode inverse scattering problem, we not only obtain a series of eigenvectors that rank the sensitivity of a seismogram to Earth structure in a series of geometrical patterns, we also can compute the surface wave equivalent of a Fresnel zone.

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
49
Top 10%
Top 10%
Top 10%
bronze