Abstract

ARIAS, César et al. FULL WAVEFORM INVERSION IN GENERALIZED COORDINATES FOR ZONES OF CURVED TOPOGRAPHY. C.T.F Cienc. Tecnol. Futuro [online]. 2018, vol.8, n.2, pp.83-88. ISSN 0122-5383.  https://doi.org/10.29047/01225383.84.

Full waveform inversion (FWI) has been recently used to estimate subsurface parameters, such as velocity models. This method, however, has a number of drawbacks when applied to zones with rugged topography due to the forced application of a Cartesian mesh on a curved surface. In this work, we present a simple coordinate transformation that enables the construction of a curved mesh. The proposed transformation is more suitable for rugged surfaces and it allows mapping a physical curved domain into a uniform rectangular grid, where acoustic FWI can be applied in the traditional way by introducing a modified Laplacian. We prove that the proposed approximation can have a wide range of applications, producing precise near-surface velocity models without increasing the computing time of the FWI.

Keywords : Full Wave Form Inversion; Reverse Time Migration; Rugged topography; Velocity estimation; Acoustic wave equation.

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