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Application of first-arrival tomography to characterize a quick clay landslide site in Southwest Sweden
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Geophysics.
2013 (English)In: Acta Geophysica, ISSN 1895-6572, Vol. 61, no 5, 1057-1073 p.Article in journal (Refereed) Published
Abstract [en]

First-arrival traveltime tomography was applied to high-resolution seismic data acquired over a known quick-clay landslide scar near the Gota River in southwest Sweden in order to reveal the geometry and physical properties of clay-related normally consolidated sediments. Investigated area proved to be a challenging environment for tomographic imaging because of large P-wave velocity variations, ranging from 500 to 6000 m/s, and relatively steeply-dipping bedrock. Despite these challenges, P-wave velocity models were obtained down to ca. 150 m for two key 2D seismic profiles (each about 500-m long) intersecting over the landslide scar. The models portrait the sandwich-like structure of marine clays and coarse-grained consolidated sediments, but the estimated resolution (20 m) is too small to distinguish thin layers within this structure. Modelled velocity structures match well the results of reflection seismic processing and resistivity tomography available along the same profiles.

Place, publisher, year, edition, pages
2013. Vol. 61, no 5, 1057-1073 p.
Keyword [en]
seismic tomography, near-surface, seismic imaging, landslides
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:uu:diva-204811DOI: 10.2478/s11600-013-0136-yISI: 000321670100001OAI: oai:DiVA.org:uu-204811DiVA: diva2:640389
Available from: 2013-08-13 Created: 2013-08-12 Last updated: 2013-08-13Bibliographically approved

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Malehmir, Alireza

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