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National Repository of Grey Literature 2 records found  Search took 0.00 seconds. 
Earthquake catalogue of completeness for eastern USA
 Arnetová, Kateřina ; Eisner, Leo (advisor) ; Kolář, Petr (referee)
The subject of this thesis is the completeness of the seismic catalogs in eastern and central parts of the USA. In the last couple of years, there were some new seismic events that raised questions about their origin. Ellsworth (2013) believes that this trend is due to induced phenomena. In this work I have tried to elucidate their origin by calculating the magnitude of completeness of the seismic catalog. For the calculation, I used two seismic catalogs, ANSS catalog and Combined catalog provided by Dr. Ellsworth. The calculation was performed using three statistical methods: MAXC, GFT and BSTAB. To complement the results, continual calculation of the magnitude of completeness by GFT has been employed for both catalogs. Calculations have proved that the magnitude of completeness of both catalogs hasn't reached the value Mc = 3 or greater since 1970, but the drop came in later years. Seismic networks were not sensitive enough to capture seismic magnitude of M = 3 or larger in all cases. Continual calculation has demonstrated that the magnitude of completeness falls below Mc = 3 in such data selection, which includes the seismic events observed after introducing a denser network of portable stations USArray. The results make it evident that the increased number of seismic events in the eastern and...
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Relation of the alteration of the basement of the Cheb Basin and CO2 discharge
 Arnetová, Kateřina ; Fischer, Tomáš (advisor) ; Boušková, Alena (referee)
The area or West Bohemia is typical by an increased geodynamic activity, which manifests itself in earthquake swarms and surface emanations of CO2 of mantle origin. These phenomena are concentrated in the tertiary Cheb basin, which is fragmented by a network of faults. The CO2 of deep origin passes along these faults to the surface and contributes to the alteration of both the basement of the basin and sedimentary infill. The aim of this thesis is to give an overview of the studied area and, with the use of well data, to verify whether the basement does show lateral changes in weathering that could indicate influence of CO2. The results show that the alteration of the basement is unequal, however no relation between the alteration and surface gas flux was found.
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1 Arnetová, Karolína
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