NDLI: Geoelectrical investigations in the Cheb Basin/W-Bohemia: An approach to evaluate the near-surface conductivity structure

Content Provider	Springer Nature Link
Author	Flechsig, Christina Fabig, Tobias Rücker, Carsten Schütze, Claudia
Copyright Year	2010
Abstract	The Cheb Basin, located in the western Eger (Ohře) Rift, is part of the European Cenozoic Rift system. Although presently non-volcanic, it is the most active area within the European Rift with signs of recent geodynamic activity like emanations of mantle derived CO$_{2}$, and the repeated occurrence of swarm earthquakes, which are common features in active volcanic regions. It is assumed that the fluids, uprising in permeable channels, play a key role for the genesis of these earthquake swarms.An image of the distribution of the electrical conductivity (resp. resistivity) in the upper crust can give information about the fluid distribution since the electrical patterns reflect pathways of fluids and fluid properties like ionic content. This was the motivation to start both a regional-scale direct current (DC) geoelectrical test covering the Cheb Basin area and several local-scale near surface investigations inside the basin at the seismically active faults Počátky-Plesná Zone (PPZ) and Mariánské Lázně Fault Zone (MLF) near Nový Kostel. It was the research idea to test electrical tomography’s ability to detect faults and tectonic deformation in a complex geological environment and to identify characteristic features of these faults.The more methodically justified regional field test mainly aimed at clarifying the opportunity to trace DC electrical signals in an area with known high industrial noise in a sufficient quality. A field set-up with a range of 15–20 km is necessary for an investigation depth of 4–5 km in case of DC geoelectrics. A new developed inversion strategy for sparse electrical data sets allows for a first (coarse) model of resistivity distribution. The near surface investigations in prominent fault zones of the Cheb Basin give more detailed information about the structure of fault zones, divide the sedimentary units in different resistivity zones and detect vertical displacements in the quaternary formations.
Starting Page	443
Ending Page	463
Page Count	21
File Format	PDF
ISSN	00393169
Journal	Studia Geophysica et Geodaetica
Volume Number	54
Issue Number	3
e-ISSN	15731626
Language	English
Publisher	Springer Netherlands
Publisher Date	2010-09-25
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Western Bohemia upper crust active faults DC geoelectrics Electrical Resistivity Tomography (ERT) resistivity distribution Meteorology/Climatology Structural Geology Geophysics/Geodesy
Content Type	Text
Resource Type	Article
Subject	Geochemistry and Petrology Geophysics

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