Morphology and causes of landslides in Portalet area (Spanish Pyrenees): Probabilistic analysis by means of numerical modelling

•Analysis of morphology and causes of a big landslide in the Pyrenees.•Excavation of parking on the base of the landslide area studied as probable cause.•Analysis of landslide with instrumentation techniques and monitoring.•Monitoring results checked by numerical modelling.

The morphology and causes of a big landslide in the Pyrenees (Northeastern Spain), reactivated by the excavation of a parkinglot on the base of the landslide area, have been analysed. Through reconnaissance and instrumentation techniques and monitoring the morphology and failure terrain of the area are defined approximately and these results are checked by numerical modelling.