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Relocation of the 1962 earthquake swarm in West Bohemia
Konrádová, Diana ; Fischer, Tomáš (advisor) ; Doubravová, Jana (referee)
Since the swarm at the turn of 1985/86 the current activity of seismic swarms in western Bohemia takes place mainly in the area of Nový Kostel at the eastern edge of the Cheb basin. However, the location of previous activities, where only more remote seismic stations were in operation, is not exactly known. This also applies to the swarm of 1962, which this bachelor thesis is focused on. Seismic bulletin data are available from eight seismic stations at a suitable distance for sufficient localization quality for this swarm. The theoretical part of the thesis presents research results of fundamental existing localization methods and their properties. In the practical part, the location of the earthquake epicenter of swarm 1962 is presented.
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Use of borehole seismometers for the study of seismic wave attenuation
Konrádová, Diana ; Fischer, Tomáš (advisor) ; Hrubcová, Pavla (referee)
Nowadays, the seismic activity is most often recorded by seismic stations on the surface of the Earth. Nevertheless, in the recent years, Czech Republic started installing the borehole seismometeres. In Hartoušov in West Bohemia and Litoměřice, new monitoring seismic boreholes were built and borehole seismometers were installed. On data gathered by the seismometers in these areas, I have applied the spectral ratio method, in order to fully understand and further specify the influence of the near-surface layer. The data stemmed from various levels of depths and distinctive geological environments. Through the analysis of amplitudes, I defined their intensification on the surface and through the definition of the signal and noise ratio I showed what the significance of the use of borehole seismometers is in terms of improving the sensitivity of monitoring. The following spectral analysis served not only as a comparison with the theoretical outcomes, but also to determine the quality factor Q in the near-surface layer in Litoměřice and Hartoušov. Lastly, I evaluated the value of Q on the scale of 5 to 30 Hz, the influence of the local effects and geology.
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Relocation of the 1962 earthquake swarm in West Bohemia
Konrádová, Diana ; Fischer, Tomáš (advisor) ; Doubravová, Jana (referee)
Since the swarm at the turn of 1985/86 the current activity of seismic swarms in western Bohemia takes place mainly in the area of Nový Kostel at the eastern edge of the Cheb basin. However, the location of previous activities, where only more remote seismic stations were in operation, is not exactly known. This also applies to the swarm of 1962, which this bachelor thesis is focused on. Seismic bulletin data are available from eight seismic stations at a suitable distance for sufficient localization quality for this swarm. The theoretical part of the thesis presents research results of fundamental existing localization methods and their properties. In the practical part, the location of the earthquake epicenter of swarm 1962 is presented.
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