A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Tomographic imaging of 3D wave-guide structures
Abstract Guided waves play important role in the investigation of near surface geological structures. As it is well-known guided waves contain information about the structural- and material parameters of the wave-guide model, so — using the methods of geophysical inversion — these characteristics can be determined by means of the frequency-dependent phase- and group velocity as well as absorption coefficient data. In this paper the approximate horizontal inversion method (Dobróka 1996) is combined with a seismic tomography procedure in order to reconstruct the 3D geometry of the wave-guide structure by means of dispersion data (group traveltimes) of the guided surface waves. The inversion procedure consists of two steps: first the local group velocities are determined at various frequencies by means of tomographic inversion of the group traveltimes, the local dispersion characteristics of the Love- or Rayleigh surface waves are then inverted in the second step. In our investigations a robust SIRT method (Dobróka 1996) is used for tomography and a simple Least Squares algorithm is applied for the inversion of the group velocity data.
Tomographic imaging of 3D wave-guide structures
Abstract Guided waves play important role in the investigation of near surface geological structures. As it is well-known guided waves contain information about the structural- and material parameters of the wave-guide model, so — using the methods of geophysical inversion — these characteristics can be determined by means of the frequency-dependent phase- and group velocity as well as absorption coefficient data. In this paper the approximate horizontal inversion method (Dobróka 1996) is combined with a seismic tomography procedure in order to reconstruct the 3D geometry of the wave-guide structure by means of dispersion data (group traveltimes) of the guided surface waves. The inversion procedure consists of two steps: first the local group velocities are determined at various frequencies by means of tomographic inversion of the group traveltimes, the local dispersion characteristics of the Love- or Rayleigh surface waves are then inverted in the second step. In our investigations a robust SIRT method (Dobróka 1996) is used for tomography and a simple Least Squares algorithm is applied for the inversion of the group velocity data.
Tomographic imaging of 3D wave-guide structures
Dobróka, M. (author)
2005
Article (Journal)
English
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