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Comparison of time-domain SH waveform inversion strategies based on sequential low and bandpass filtered data for improved resolution in near-surface prospecting.
Köhn, Daniel, Wilken, Dennis, De Nil, Denise, Wunderlich, Tina, Rabbel, Wolfgang, Werther, Lukas, Schmidt, Johannes, Zielhofer, Christoph and Linzen, Sven (2019) Comparison of time-domain SH waveform inversion strategies based on sequential low and bandpass filtered data for improved resolution in near-surface prospecting. Journal of Applied Geophysics, 160 . pp. 69-83. DOI 10.1016/j.jappgeo.2018.11.001.
Full text not available from this repository.Abstract
The full waveform inversion (FWI) of strongly dispersive Love wave data is a challenging task. Amplitude, phase and dispersion information not only depends on the density and shear modulus distribution in the subsurface, but also significantly on intrinsic damping. This is especially a problem in near surface data applications with complex underground structures and low Qs values. Therefore, the FWI of a dispersive Love wavefield demands an accurate initial visco-elastic model and careful data pre-processing. Another key ingredient of a successful time-domain FWI is the sequential inversion of frequency filtered data in order to mitigate the non-linearity of the inverse problem. Common FWI strategies are based solely on either low- or bandpass filtered data. In this study we develop a FWI workflow consisting of a combined low- and bandpass filter strategy to achieve an appropriate data fit of the low-frequency Love wave and high-frequency refracted SH-wavefield. The applicability of this FWI strategy and the importance of a visco-elastic medium description is demonstrated for SH field data from a transect over the Fossa Carolina, a silted medieval canal structure in southern Germany. The resolved canal shape and small scale structures in the inversion results are verified by an archaeological excavation.
Document Type: | Article |
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Keywords: | Full waveform Inversion, Love wave, Near surface, Archaeological prospection |
Research affiliation: | Kiel University > Kiel Marine Science OceanRep > The Future Ocean - Cluster of Excellence Kiel University |
Refereed: | Yes |
Open Access Journal?: | No |
Publisher: | Elsevier |
Projects: | Future Ocean |
Date Deposited: | 13 Aug 2019 09:26 |
Last Modified: | 02 Jan 2020 12:28 |
URI: | https://oceanrep.geomar.de/id/eprint/47470 |
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