Comparison of straight and curved-ray surface wave tomography at near-surface scale
A 3d numerical example
M. Karimpour (Polytechnic University of Turin)
Evert Slob (TU Delft - Applied Geophysics and Petrophysics)
Laura Valentina Socco (Polytechnic University of Turin)
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Abstract
Surface Wave Tomography (SWT) is used to build shear-wave velocity models. In some studies, it is assumed that surface waves propagation follows a straight line between the source and the receiver. This assumption might be violated in near-surface studies because of high level of complexity and lateral heterogeneity. In curved-ray SWT, the actual ray paths between every receiver couple are computed. Curved-ray SWT can increase the accuracy of the model and will increase the computational effort. It is important to investigate the gained model improvement together with the associated additional computational cost from curved-ray over straight-ray SWT for near-surface applications. We apply straight- and curved-ray SWT on a generated 3D synthetic dataset and compare the results in terms of accuracy and computational costs.