Full waveform inversion of SH- and Love-wave data in near-surface prospecting

Dokter, E., Köhn, D., Wilken, D., De Nil, D. and Rabbel, W. (2017) Full waveform inversion of SH- and Love-wave data in near-surface prospecting Geophysical Prospecting, 65 . pp. 216-236. DOI 10.1111/1365-2478.12549.

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Abstract

We develop a two-dimensional full waveform inversion approach for the simultaneous determination of S-wave velocity and density models from SH - and Love-wave data. We illustrate the advantages of the SH/Love full waveform inversion with a simple synthetic example and demonstrate the method's applicability to a near-surface dataset, recorded in the village Čachtice in Northwestern Slovakia. Goal of the survey was to map remains of historical building foundations in a highly heterogeneous subsurface. The seismic survey comprises two parallel SH-profiles with maximum offsets of 24 m and covers a frequency range from 5 Hz to 80 Hz with high signal-to-noise ratio well suited for full waveform inversion. Using the Wiechert–Herglotz method, we determined a one-dimensional gradient velocity model as a starting model for full waveform inversion. The two-dimensional waveform inversion approach uses the global correlation norm as objective function in combination with a sequential inversion of low-pass filtered field data. This mitigates the non-linearity of the multi-parameter inverse problem. Test computations show that the influence of visco-elastic effects on the waveform inversion result is rather small. Further tests using a mono-parameter shear modulus inversion reveal that the inversion of the density model has no significant impact on the final data fit. The final full waveform inversion S-wave velocity and density models show a prominent low-velocity weathering layer. Below this layer, the subsurface is highly heterogeneous. Minimum anomaly sizes correspond to approximately half of the dominant Love-wavelength. The results demonstrate the ability of two-dimensional SH waveform inversion to image shallow small-scale soil structure. However, they do not show any evidence of foundation walls.

Document Type: Article
Research affiliation: Kiel University
Kiel University > Kiel Marine Science
OceanRep > The Future Ocean - Cluster of Excellence
Refereed: Yes
DOI etc.: 10.1111/1365-2478.12549
ISSN: 00168025
Date Deposited: 16 Jan 2018 10:41
Last Modified: 16 Jan 2018 10:41
URI: http://eprints.uni-kiel.de/id/eprint/41471

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