Seismographs recorded the tremor at 13.01 hours about 17 kilometres west of Petrinja with a magnitude of 4.1 on the Richter scale. Its intensity at the epicentre was V degrees on the EMS scale.
A moderate tremor of 3.1 on the Richter scale was registered near Petrinja during the night as well, with the intensity at the epicentre of IV degrees on the EMS scale.
Since midnight, a total of eight tremors have been registered in the Petrinja area with magnitudes of between 2 to 3 on the Richter scale. Those were aftershocks.