Rainfall-Induced Landslides response to extreme rainfall events in the Northern Patagonia

Rainfall-Induced Landslides (RIL) is an active process in mountain regions during extreme rainfall events. RIL is often known to be the cause of severe damage to structures and infrastructures in the Northern Patagonia (41.7ºS - 42.4ºS). We evaluated surface deformation variations in 10 active RILs in northern Patagonia (41.7ºS - 42.4ºS) during 2015-2020. Sentinel 1A / B data were used thought PS-SAR and corrected using GACOS. Our results showed changes in the RIL activity, varying from no deformation up to 40 mm/yr in slope zones over 35º. Moreover, five RIL events increased their deformation rates, from 20 mm/yr up to 200 mm/yr after precipitation events of 130 mm in 24 hrs. It should be noted that the identified RILs are located inside the Liquiñe-Ofqui Fault System, which would suggest possible structural control. Future work will focus on characterizing the geotechnical and soil-mineralogical properties. The integration of geotechnical and deformation data will allow understanding the response of the active RIL to rainfall variations.