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National Repository of Grey Literature 2 records found  Search took 0.01 seconds. 
Geophysical exploration of supposed maar volcanoes in Western Bohemia
 Turjaková, Veronika ; Valenta, Jan (advisor) ; Skácelová, Zuzana (referee)
We were investigating two localities of supposed maar volcanoes, Ztracený rybník and Bažina, which can be found at the western margin of the Eger rift on the presumed line of the Tachov fault. The Eger rift was abundant in volcanic activity during Tertiary and still is a seismoactive zone with distinct post- volcanic features. The examined structures are distinct morphological depressions (ca. 30 m deep and several hundreds meters wide) with a circular shape which is characteristic for maar structures. We studied the locality using a complex of geophysical methods: a ground magnetometry, electric resistivity tomography and a time-domain electromagnetic sounding. The results showed a circular rim of high resistivities around the depressions and approximately 100 m of sediments filling the depression. Moreover, we have mapped a negative magnetic anomaly in the lesser of these two structures (Bažina) indicating a basic intrusion that got close to the surface. Moreover, we have observed the intrusion on the resistivity data as well. Therefore, we can suggest that these two structures are diatremes created during the phreatomagmatic eruption. The lesser maar (Bažina) erupted during the reversed geomagnetic field.
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Effect of CO2 production on the water level in a closed borehole
 Turjaková, Veronika ; Vlček, Josef (advisor) ; Lanzendörfer, Martin (referee)
This thesis is focused on upper mantle originated carbon dioxide exhalations in the area of Western Bohemia, particularly Cheb basin. It describes local geology, current geodynamics, earthquake swarms and related issues. The thesis introduces a simple physical model of gas- water mixture behaviour in a closed borehole. The model was created using elementary physical principles and works as a tool for simplifying the description of events, which were registered at a monitoring borehole HJB-1 at Hartoušov site. Last part of the thesis includes data which were recorded for the verification of the model. These are presented and interpreted at the end of the thesis. Key words: carbon dioxide, Henry's law, Cheb basin
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