oa Landslides on Lev Hill in Lviv City, Western Ukraine

For the first time, a detailed survey of the territory of the Lev Hill, located nearly at the center of Lviv city and serving as its highest natural peak, was conducted. Reliable information about its geological structure was obtained. The hill’s cross-section consists of Miocene deposits of Langian age (lower layers composed of Narajiv limestone overlain sand by Kaiserwald Beds) and Seravallian age (Ternopil Beds consisting of sandstones and limestones and Bugliv beds containing clay with oyster detritus). It was determined that the hill’s construction includes numerous differently-oriented, steeply-dipping faults that divide its territory into several tectonic blocks. During the survey, multiple manifestations of landslides were recorded on the slopes of the hill for the first time. An assessment of the landslide risk on all hill slopes was conducted. The landslides vary in planform shape, with cirque-like landslides being predominant. They exhibit different gravitational phenomena and structures, insequent structural incipient and plastic types. Most of them are fully stabilized. However, a considerable number of plastic creeping-landslides are still active on the northwestern slopes. On the southwestern flank, two temporarily stabilized cirque-shaped landslides are present. At the foot of this slope, a compression ridge has formed and continues to grow.