Slope stability analysis and suggestive measures for an active landslide in Indian Himalaya -- Analysis of a combined circular-toppling slope failure in an open-pit -- Reflection of Processes of Two-Phase Filtration in Fluid Saturated Hierarchic inclusion in a Block Layered Medium by Data of Active Wave Geophysical Monitoring. Evaluation of the landslide in Erzurum ski-jumping complex-A Case St…