Abstract
In 2011, a geophysical survey was carried out in the surroundings of the Jagiellonian University in Cracow, using a Very Low Frequency method. The measurements were designed to determine the reason of frequent flooding of the lowest level of the building. The main objective of the study was to find out from where and in which way the rainwater seeps into the building and how this problem can be solved in the least invasive manner. The aim of geophysical methods was also to provide necessary information that will enable the construction of a hydro-geological model of the local environment. The interpretation revealed the presence of a sandy gutter surrounded by impermeable clay. There is a big resistivity contrast between those layers. Their location and approximate dimensions were determined.
Highlights
The aim of this study is to examine the extent to which the Very Low Frequency method can be useful in mapping shallowly buried geological structures
The study shows that the method is dedicated to the detection of conductors in low-conductive soils, it is effective for shallow issues detection in low resistivity layers
Small resistivity contrasts between low resistivity materials are very well recorded
Summary
The aim of this study is to examine the extent to which the Very Low Frequency method can be useful in mapping shallowly buried geological structures. VLF EM induction method is used to determine the electric properties of the rock in the superficial zone. On this basis, there is a possibility to establish the type of material present in the examined environment. Clays and loams have very low electrical resistivity (Table 2), but sands (even saturated by water) are characterized by higher resistivity (Table 3). The saline water, which saturates rocks, clays and sands is characterized by ionic conduction, and their resistivities are relatively low (Antoniuk et al 2003). The main impact on the resistivity of biphasic rock has the component of lower resistivity In this case, VLF EM as a geophysical method should provide information about the hydrogeological conditions for technical and construction purposes
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