Inventory of Precipitation Triggered Landslides in the Winter of 2013 in Zagreb (Croatia, Europe)

The subject of this paper is inventory of precipitation induced landslides in Zagreb in the period of extreme weather conditions in the winter of 2013. Long-lasting heavy rainfall and a thick snow cover triggered more than 60 landslides in the hilly area of the Medvednica Mt. which belongs to the City of Zagreb. Basic data about landslide event locations, received from records of the City Office of Emergency Management (OEM), are analyzed. We present the results of preliminary temporal distribution analysis of landslide occurrence during the following extremes: cumulative monthly precipitation in January, February and March in 2013 was 130–190 % higher than the average monthly values for the period from 1862 to 2012; and cumulative precipitation for a 3-month period in 2013 has the highest value in the last 150 years. Spatial distribution analysis shows that most of the analyzed landslide events were triggered in engineering soils of Pontian age (approximately 1 landslide per 2 km²). Presented landslide inventory map provide a solid basis for organizing further research aimed at the analysis of landslide triggering rainfall thresholds as well as development of landslide inventory map which will depict landslide contours.