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Petrinja earthquake aftershocks – locations, focal mechanisms and related Coulomb stress change

The devastating Petrinja earthquake of 29 December 2020 (Mw = 6.4) was followed by a large number of aftershocks. In the first six months of the sequence we were able to hand-pick over a quarter of million earthquake phase onset times, corresponding to 13897 locatable events. Analyses of the Coulomb stress change on optimally oriented strike-slip and dip-slip faults following the mainshock rupture, reveals that a large majority of aftershocks occurred in the volumes characterised by the Coulomb static stress increase, whereas the areas where the effective stress decreased remained mostly quiet. The distribution and preferred strike directions of strike-slip and reverse faulting inferred by the Coulomb stress transfer analyses are also in good agreement with individual focal mechanisms.

Petrinja earthquake, aftershocks, focal mechanism solutions, Coulomb stress change

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