Zagreb occasionally experiences earthquakes, due to the proximity of Žumberak-Medvednica fault zone. It's classified as an area of high seismic activity. The area around Medvednica was the epicentre of the 1880 Zagreb earthquake (magnitude 6.3), and the area is known for occasional landslide threatening houses in the area. The proximity of strong seismic sources presents a real danger of strong earthquakes. Croatian Chief of Office of Emergency Management Pavle Kalinić stated Zagreb experiences around 400 earthquakes a year, most of them being imperceptible. However, in case of a strong earthquake, it's expected that 3,000 people would die and up to 15,000 would be wounded.