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National Repository of Grey Literature 2 records found  Search took 0.00 seconds. 
The crust/mantle boundary in geodynamically active area of West Bohemia
 Podolník, Jan ; Hrubcová, Pavla (advisor) ; Málek, Jiří (referee)
The region of West Bohemia is one of the most geodynamically active areas of Central Europe. The activity is characterized by many natural phenomena such as recurrent seismic swarms. The crustal structure of the region was subject of many geophysical investigations that revealed increased reflectivity of the lower crust. In this thesis, we adapt the multi-azimuthal approach for the detection of crustal discontinuities developed by Hrubcov'a et al. (2013). We apply the ap- proach on waveforms of the 2000 and 2008 swarms that occurred in the Nov'y Kos- tel focal area registered by several German stations. Analysis of the data of more distant German stations allowed expanding of the information about the depth and character of the crust/mantle transition in a broader area of the West Bo- hemia region. The results show a thickening of the zone in Germany with in- creasing distance from the epicentral area. Such findings are in agreement with previous active and passive seismic experiments.
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Contactless conductometry for shallow parts of geological medium
 Podolník, Jan ; Dohnal, Jiří (advisor) ; Kněz, Jaroslav (referee)
The task is focused on the issue of contactless conductometry for shallow parts of geological medium and it consists of two connected parts, search and experimental. The first part includes fundamental theoretical principles of contactless conductivity measurement, summary of presently manufactured electromagnetic devices (ground conductivity meters) and finally it presents the potentialities of using conductometry for detection and monitoring of contaminants. The basis of the second part comprises the field test measurements with the instrument CMD (producer GF Instruments, s.r.o. Brno) on the selected locality, namely for several depth levels. The contents of this part include the field measurement, data processing and complex interpretation of the results in connection with geological conditions of the locality, petrophysical knowledge and with the stability of the device.
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