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000049051 0247_ $$2DOI$$a10.2113/JEEG10.3.287
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000049051 084__ $$2WoS$$aGeochemistry & Geophysics
000049051 084__ $$2WoS$$aEngineering, Geological
000049051 1001_ $$0P:(DE-Juel1)VDB9304$$aTillmann, A.$$b0$$uFZJ
000049051 245__ $$aAn unsupervised wavelet transform method for simultaneous inversion of multimode surface waves
000049051 260__ $$aAlxandria, Va.$$bGeoScienceWorld$$c2005
000049051 300__ $$a287 - 294
000049051 3367_ $$0PUB:(DE-HGF)16$$2PUB:(DE-HGF)$$aJournal Article
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000049051 440_0 $$07541$$aJournal of Environmental and Engineering Geophysics$$v10$$x1083-1363$$y3
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000049051 520__ $$aDispersive surface waves are sensitive to the geometry of layered structures and the compressional and shear wave velocities within each layer. Therefore they can be used to estimate the structure and lithology of shallow soils. It is common practice to use the low frequency fundamental mode for inversion; thus, it is necessary to separate the single modes contained in the data interactively, which is time consuming and a source of error.The fast algorithm presented in this paper interprets all excited modes of a surface wave simultaneously and avoids the need to identify individual mode-numbers. The inversion is based on the group travel time of a Rayleigh wave, estimated from a single seismic trace by application of the Continuous Wavelet Transform (CWT). The resulting CWT distribution is fitted by a composition of wavelets determined from theoretical group-velocity dispersion relations of possible models, in connection with appropriate boundary conditions.A feasibility test on a synthetic dispersion dataset with dominant higher modes shows that the systematic inversion error associated with a fundamental-mode assumption does not arise, and both layer thicknesses and elastic properties can converge rapidly to the true values. However, two possible problems with the proposed method are the imperfect reconstruction (in this case especially at low frequencies), owing to the limited number of wavelets and theoretical modal dispersion curves used for approximation, and possible convergence to local minima, due to the increased nonlinearity of the misfit function.
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000049051 773__ $$0PERI:(DE-600)2252108-2$$a10.2113/JEEG10.3.287$$gVol. 10, p. 287 - 294$$p287 - 294$$q10<287 - 294$$tJournal of environmental & engineering geophysics$$v10$$x1083-1363$$y2005
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000049051 9131_ $$0G:(DE-Juel1)FUEK257$$bEnvironment (Umwelt)$$kU01$$lChemie und Dynamik der Geo-Biosphäre$$vChemie und Dynamik der Geo-Biosphäre$$x0
000049051 9141_ $$y2005
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