Print Email Facebook Twitter Estimating a continuous p-wave velocity profile with constant squared-slowness gradient models from seismic field data Title Estimating a continuous p-wave velocity profile with constant squared-slowness gradient models from seismic field data Author Ponomarenko, A.V. Kashtan, B.M. Troyan, V.N. Mulder, W.A. Faculty Civil Engineering and Geosciences Department Geoscience and Engineering Date 2015-12-31 Abstract We inverted seismic field data for a continuous, laterally invariant P-wave velocity profile. Instead of the usual approach that involves horizontal layers with piecewise constant densities and velocities, we consider models of one or two layers with a constant gradient of the squared slowness above a homogeneous halfspace. With a single layer above a halfspace, there are three parameters. With two layers, there are five. We solve the inverse problem by a direct grid search over a wide range of parameters. The results were compared to that of a piecewise-constant multi-layer inversion result. In the single-layer case, either the shallow or the deeper part of the model would match the multi-layer case, depending on which modes of the surface waves were selected. With two layers, a considerably better agreement is obtained over a larger depth range. Our method is limited to cases with a small Vs/Vp-ratio but has only 5 parameters. It could be a useful alternative to piecewise-constant multi-layer inversion, in particular if continuous P-velocity profiles are sought. These are sometimes better suited as a starting model for full waveform inversion than models with many discontinuities. To reference this document use: http://resolver.tudelft.nl/uuid:e5221293-3aa4-4b5f-9ba7-00f6ae7e4251 Publisher EAGE Source Proceedings of the Near Surface Geoscience 2015, 21st European Meeting of Environmental and Engineering Geophysics, Turin (Italy), 6-10 Sept., 2015 Part of collection Institutional Repository Document type conference paper Rights (c) 2015 The Authors Files PDF 321865.pdf 1.85 MB Close viewer /islandora/object/uuid:e5221293-3aa4-4b5f-9ba7-00f6ae7e4251/datastream/OBJ/view