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| Hobro, Jwd; Singh, Sc; Minshull, Ta. |
| A tomographic inversion method is presented for the determination of 3-D velocity and interface structure from a wide range of body-wave seismic traveltime data types. It is applicable to refraction, wide-angle reflection, normal-incidence and multichannel seismic data, and is best suited to a combination of these that provides good independent constraints on seismic velocities and interface depths. The inversion process seeks a layer-interface minimum-structure model that is able to explain the given data satisfactorily by inverting to minimize data misfit and model roughness norms simultaneously. This regularized inversion, and the use of smooth functions to describe velocities and depths, allows the highly non-linear tomographic problem to be... |
| Tipo: Text |
Palavras-chave: Inversion; Ray tracing; Seismic modelling; Seismic structure; Tomography; Traveltime. |
| Ano: 2003 |
URL: https://archimer.ifremer.fr/doc/00466/57759/60044.pdf |
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| Lomax, A. |
| In this paper, we examine an efficient, practical method to calculate approximate, finite-frequency waveforms for the early signals from a point source in 3-D acoustic media with smoothly varying velocity and constant density. In analogy to the use of Feynman path integrals in quantum physics, we obtain an approximate waveform solution for the scalar wave equation by a Monte Carlo summation of elementary signals over a representative sample of all possible paths between a source and observation point. The elementary signal is formed from the convolution of the source time function with a time derivative of the Green's function for the homogeneous problem. For each path, this elementary signal is summed into a time series at a travel time obtained from an... |
| Tipo: Text |
Palavras-chave: Inversion; Lateral heterogeneity; Synthetic waveforms; Wave equation; Wave propagation. |
| Ano: 1999 |
URL: https://archimer.ifremer.fr/doc/00466/57771/60028.pdf |
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