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Title: An inversion of rayleigh waves dispersion curves as a tool to recognize the bedrock depth in Chorzów Stary, Poland
Authors: Mendecki, Maciej J.
Zuberek, Wacław M.
Hrehorowicz, Przemysław
Jarek, Szymon
Keywords: Ambient seismic noise; ReMi; resistivity imaging; bedrock-overburden boundary; Chorzów Stary
Issue Date: 2012
Citation: Contemporary Trends in Geoscience, Vol. 1 (2012), s. 39-44
Abstract: Identification of a bedrock beneath soft cover is one of the most important task in engineering geology. The location of boundary-overburden information may be used by investors, builders and municipal authorities to design an infrastructure or land-use plans. In such issues the application of appropriate geophysical methods is useful. However, in urban zones and areas characterized by subsurface soft layer the usage of certain methods (eg.: seismic refraction) is not advisable. The passive method of Refraction Microtremor (ReMi) can fulfill its tasks in the relatively difficult urban environment. The vertical S-wave velocity profiles were carried out as a result of inversion of Rayleigh wave dispersion curves obtained from ReMi method. The change of S-wave velocities allowed to distinguish shallow geological layers in the area of Chorzów Stary. Preliminary measurements allowed to identify the Carboniferous bedrock at a depth of 14 -18 m what has been confirmed by resistivity imaging. Furthermore, unconsolidated deposits are also recognized and the seismic results show a good correlation with the available geological information and resistivity imaging data.
DOI: 10.2478/ctg-2012-0005
ISSN: 2084-5707
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