The resistivity image of the Muráň fault zone (Central Western Carpathians) obtained by electrical resistivity tomography

Abstract

Abstract:The paper describes the application of geophysical prospecting techniques for estimation of the fault's inclination. The field survey was carried out across the Muráň fault structure in the Slovenské rudohorie Mts (central Slovakia). Three different geophysical methods were used to map the fault zone: Electrical Resistivity Tomography (ERT), induced polarization (IP) and radon emanometry. All these methods have been used to locate the fault zone area, but the principal aims of this research are to test the efficiency of the 2D ERT technique to recognize the geometrical characterization of the fault and to improve our tectonic knowledge of the investigated area. For the synthetic cases, three geometric contexts were modelled at 60, 90 and 120 degrees and computed with the l 2 norm inversion method, the l 1 norm with standard horizontal and vertical roughness filter and the l 1 norm with diagonal roughness filter. In the second phase this geophysical methodology was applied to fieldwork data. Our results confirm that the ERT technique is a valuable tool to image the fault zone and to characterize the general geometry, but also the importance of setting up the right inversion parameters. The main contribution of the geophysical investigations in this case was the determination of the location and confirmation of the inclination of the Muráň fault. The result of this study is the ability to make a visual estimation of the direction and dip of the fault. Pursuant to this work the dipole-dipole electrode configuration produces the best resolution, particularly for the location of vertical and dipping structures. The advantage of this array is that it shows the ability to assess the trend of the dip and therefore it can be strongly recommended. The result is also a case study of a small scale tectonic survey involving geophysical methods.

Calculation of temperature distribution and rheological properties of the lithosphere along transect I in the Western Carpathians

“…Furthermore, the abundance of geophysical data (Vozár andŠantavý 1999) such as deep seismic reflection and refractions profiles (Beránek and Zátopek, 1981;Mayerová et al, 1994;Tomek et al, 1987Tomek et al, , 1989, gravity (Bielik et al, 1990(Bielik et al, , 2006Alasonati Tašárová et al, 2009), radiometric (Mojzeš, 1998;Putiška et al, 2005), geoelectric (Putiška et al, 2012) and surface heat flow data (Čermák et al, 1991;Majcin 1994;Majcin et al, 1998) provide valuable constraints on tectonic models of the area. For that reason, we decided to apply 2-dimensional integrated modelling algorithm to calculate rheological model of the lithosphere along transect I passing through the Carpathian-Pannonian basin region.…”

The first stripped gravity map of the Turčianska Kotlina Basin

“…This result is also supported by the 2D density modelling in the TKB, which has been done by Grinč et al (2010). For verification of this hypothesis and to study in more detail the tectonic contact between the crystalline mountains and the detailed geoelectric, electrical resistivity tomography, microgravity and radon measurements (e.i., Putiška et al, 2012;Mojzeš et al, 2006;Kušnirák et al, 2011 ). These measurements could help also to interpret the areas of planation surfaces and alluvial deposits of the TKB (Kováč et al, 2011;Vojtko et al, 2011;Petrýdesová et al, 2011;Kušnirák et al, 2011).…”

Geophysical survey of Neovolcanic complexes in the first protection zone of the Sliač Spa and the Baková jama

“…Emanation of radon from a geological environment was an object of many research papers dealing with the radon concentration in the ground waters (Gluch et al, 2011) and further with mapping of tectonic lines and geological units according to the radon concetration changes (Miles and Appleton, 2005;Mojzeš, 2005;Mojzeš et al, 2006;Gluch et al, 2011;Putiška et al, 2012).…”