The North Medvednica Fault, a reverse fault which reaches the surface at the northern fringe of Medvednica, is believed to be responsible for the 2020 Zagreb earthquake, which caused a 5.5 earthquake with an epicentre in the inner city area. The most dangerous fault on Medvednica is thought to be the NNW–SSE-oriented strike-slip Kašina Fault, passing through Kašina, around from the city centre, which could produce earthquakes up to 6.5–6.6 in strength.