At 11:19:54 (UTC) on the 29th of December 2020, a magnitude 6.4 earthquake occurred in Croatia about 50km SE of the capital Zagreb, see map below. The earthquake nucleated at a relatively shallow depth of 10km within the Eurasia plate. It occurred after a magnitude 5.2 earthquake struck in the same area on the 28th December 2020 at 05:28 (UTC). At the time of writing at least one fatality was reported, at least 20 injured people and building damage especially in Petrinja, a town with about 25,000 inhabitants. Though earthquakes with magnitude over 6 happened before in Croatia this is the strongest event that was ever recorded in Croatia since modern seismic instrumentation is in use.
The earthquake was recorded at seismic stations worldwide, including stations of the Irish National Seismic Network (INSN), see seismic waveforms below.
Further information is available from the following sources: