engleski

Which one of the three latest large earthquakes in Zagreb was the strongest – the 1905, 1906 or 2020 one?

Following the damaging 2020 earthquake of 22 March 2020 (Mw 5.3), a question was raised if this was the largest event after the Great Zagreb earthquake of 1880. The counter-candidates are the events of 17 December 1905 and 2 January 1906. Relevant earthquake catalogues largely disagree when the magnitudes of the Zagreb earthquakes of 1905 and 1906 are concerned. The reported magnitudes range between 5.1 and 5.6 for the 1905 event, and between 5.3 and 6.3 for the earthquake of 1906. Epicentral intensities for the two earthquakes are stated between VII–VIII and IX. To try to resolve the question, we (re)analysed all available macroseismic data for the two historical events, in order to compare the observed intensity distribution with the one of the 2020 earthquake.

Historical earthquake quantification, macroseismic magnitude, historical seismograms, Zagreb epicentral area

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