According to the US Geological Survey (USGS), the quake hit about 5 kilometers northeast of the Slovene town of Ilirska Bistrica, 32 kilometers northwest of the Croatian city of Rijeka and 37 kilometers east of the Italian city of Trieste.

The Krško nuclear power plant, in the east of the country, has frequently been a cause for concern among scientists. On Friday, environmental activists from the Alpe Adria Green NGO signed a resolution against the construction of a second reactor at the plant, warning against the danger of earthquakes.