uu.seUppsala University Publications
Change search
ReferencesLink to record
Permanent link

Direct link
High-resolution near-surface velocity model building using full-waveform inversion-a case study from southwest Sweden
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Geophysics.
2014 (English)In: Geophysical Journal International, ISSN 0956-540X, E-ISSN 1365-246X, Vol. 197, no 3, 1693-1704 p.Article in journal (Refereed) Published
Abstract [en]

Full-waveform inversion (FWI) is an iterative optimization technique that provides high-resolution models of subsurface properties. Frequency-domain, acoustic FWI was applied to seismic data acquired over a known quick-clay landslide scar in southwest Sweden. We inverted data from three 2-D seismic profiles, 261-572 m long, two of them shot with small charges of dynamite and one with a sledgehammer. To our best knowledge this is the first published application of FWI to sledgehammer data. Both sources provided data suitable for waveform inversion, the sledgehammer data containing even wider frequency spectrum. Inversion was performed for frequency groups between 27.5 and 43.1 Hz for the explosive data and 27.5-51.0 Hz for the sledgehammer. The lowest inverted frequency was limited by the resonance frequency of the standard 28-Hz geophones used in the survey. High-velocity granitic bedrock in the area is undulated and very shallow (15-100 m below the surface), and exhibits a large P-wave velocity contrast to the overlying normally consolidated sediments. In order to mitigate the non-linearity of the inverse problem we designed a multiscale layer-stripping inversion strategy. Obtained P-wave velocity models allowed to delineate the top of the bedrock and revealed distinct layers within the overlying sediments of clays and coarse-grained materials. Models were verified in an extensive set of validating procedures and used for pre-stack depth migration, which confirmed their robustness.

Place, publisher, year, edition, pages
2014. Vol. 197, no 3, 1693-1704 p.
Keyword [en]
Numerical solutions, Inverse theory, Controlled source seismology, Seismic tomography
National Category
Geochemistry Geophysics
URN: urn:nbn:se:uu:diva-228461DOI: 10.1093/gji/ggu070ISI: 000337041100032OAI: oai:DiVA.org:uu-228461DiVA: diva2:734292
Available from: 2014-07-16 Created: 2014-07-15 Last updated: 2014-07-16Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full text

Search in DiVA

By author/editor
Malehmir, Alireza
By organisation
In the same journal
Geophysical Journal International

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 366 hits
ReferencesLink to record
Permanent link

Direct link