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EN
In March of 2014 at ruins of the 14th century castle, situated at the top of Mount Żar in Małopolska region, Poland, geophysical surveys were performed. Surveys were planned to investigate remains of the castle that could remain in the ground. Electrical Resistivity Tomography method was used there. In the paper 4 sections have been presented. During interpretation, as the supporting method, maps of Depth-of-Investigation (DOI) index have been used. Results of the surveys can point out potential remains of the castle walls and ruins of buildings that were situated in the stronghold.
EN
Interpretation of resistivity cross sections may be in many cases unreliable due to the presence of artifacts left by the inversion process. One way to avoid erroneous conclusions about geological structure is creation of Depth of Investigation (DOI) index maps, which describe durability of prepared model with respect to variable parameters of inversion. To assess the usefulness of this interpretation methodology in resistivity imaging method over quaternary sediments, it has been used to one synthetic data set and three investigation sites. Two of the study areas were placed in the Upper Silesian Industrial District region: Bytom–Karb, Chorzów–Chorzów Stary; and one in the Southern Pomeranian Lake District across Piława River Valley. Basing on the available geological information the results show high utility of DOI index in analysis of received resistivity models, on which areas poorly constrained by data has been designated.
EN
Conducted by "Olkusz" Speleological Club exploratory works related to the Gieńkówka cave led only to its partial opening. There are indications stating that this cave has continuation beyond its currently available parts. In order to verify those assumptions resistivity imaging method has been used. During analysis of the resistivity models obtained from field measurements the synthetic model, simulating the intersection of the cave corridor, has been utilized. In order to assess the reliability of resistivity cross sections in terms of the presence of artifacts left by the inversion process Depth of Investigation (DOI) index has been applied. For preparing DOI maps two inversions on the same data set were carried out using different reference models. Then the results were compared to each other. High resistivity anomalies revealed on obtained models show strong correlation with actual caves known in this area. In addition, similar anomalies have been found in place of the predicted continuity in Gieńkówka cave, thus confirming the hypothesis made in this research. High DOI index values in the occurrence of caves pointing to the instability of the inversion process in those areas.
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