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Magnitude-frequency distribution of the seismic activity preceding the Fagradalsfjall 2021 eruption
 Severini, Bianca Georgina ; Fischer, Tomáš (advisor) ; Hrubcová, Pavla (referee)
iv Abstract This bachelor's thesis focuses on the estimation of the parameter b derived from the Gutenberg- Richter law talking about the dependency of the events' frequencies on their magnitude during seismic activity preceding the effusive eruption on 19th March 2021 Fagradalsfjall, Iceland. The data were selected in space and time from seismic catalogue comprising records from 10th January 2021 until 10th August 2022. The maximum likelihood method was used when computing the b value and the goodness of fit method for estimating the magnitude of completeness MC. In order to give a comparison to resulting b values, newly introduced method called b-positive was added to this thesis. B-positive was designed to withstand temporal incompleteness of the seismic catalogue and to be fully independent on the MC. All values were computed with computational script made in MATLAB in cooperation with consultant of this thesis. It was searched for the space and time dependency among the selected seismic data clusters in Fagradalsfjall and Krýsuvík system. Results at the Fagradalsfjall system are proving the activity was connected to tectonic movements and to the intrusion of magmatic dyke. Divergent plate boundary in this area shows lower values in comparison with the magmatic dyke which has higher values. For the...
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