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Identifying landslide preconditions in Swedish quick clays - insights from integration of surface geophysical, core sample- and downhole property measurements
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Geophysics.
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Geophysics.
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Geophysics. Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Natural Resources and Sustainable Development.
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Natural Resources and Sustainable Development.
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2016 (English)In: Landslides: Journal of the International Consortium on Landslides, ISSN 1612-510X, E-ISSN 1612-5118, Vol. 13, no 5, 905-923 p.Article in journal (Refereed) Published
Abstract [en]

Quick-clay landslides are a serious geohazard in Canada, Norway and Sweden. Identification and mapping of quick clays are essential endeavours because the damage caused by an individual landslide can be large and costly, with potentially fatal consequences. We collected geophysical borehole and soil core data from an area prone to quick-clay landslides in southwestern Sweden. Methodologies included in situ and laboratory measurements, providing information about natural gamma radiation, sonic velocities, electrical conductivity, pH, physical grain size, elemental and mineral composition, magnetic properties, cation exchange capacity and fossil content. A stratigraphic thickness of almost 60 m enables us to study quick clays and their host environment in Sweden at unusually high resolution. Results identify the origin and location of reflections in nearby seismic lines and assign physico-chemical properties to the geological units present in the area. We show that coarse-grained layers are sandwiched between marine clays (some of which are quick clays). These layers function as a conduit for relatively fresh water that infiltrates the marine clays and chemically destabilizes them by leaching out their salts. The salinity distribution in the boreholes indicate that the groundwater movement is downwards, through the coarse-grained layer and towards the Gota river. The presence of these materials is important for the development of quick clays, although not a prerequisite. With the help of surface geophysical methods, the location of the coarse-grained layers can be known faster and more economically, which could be relevant for studying the potential for quick-clay landslide occurrence over large areas.

Place, publisher, year, edition, pages
2016. Vol. 13, no 5, 905-923 p.
Keyword [en]
Landslide; Quick clay; Southwestern Sweden; Correlation; Downhole geophysics; Physico-chemical properties
National Category
Geophysics
Identifiers
URN: urn:nbn:se:uu:diva-270198DOI: 10.1007/s10346-015-0633-yISI: 000385174600005OAI: oai:DiVA.org:uu-270198DiVA: diva2:887131
Funder
Swedish Research Council Formas
Note

Erratum in Landslides 13(5) pg: 1319 DOI: 10.1007/s10346-015-0653-7

Available from: 2015-12-22 Created: 2015-12-22 Last updated: 2017-12-01Bibliographically approved

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Snowball, Ian

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