Spatio-temporal evolution of ground displacement of the tena landslide (Spain)

Abstract

The scope of the DO-SMS program is dedicated to the ground displacement observation. We present here our results for the Tena landslide (Spain). By combining geotechnical and remote sensing tools precise ground displacement maps were established. Using the multi-temporal photographs optical correlation was performed. Correlation is used for quantifying the north/east components of ground displacement of the area and the last component was calculated by using Permanent Scatterers. These results point out a new landslide history. An initial period (1994-2003) in which the upper part of the debris avalanches flowed westward. The second period commenced with the construction in 2004 of a car park and is marked by the deviation of the landslide downward to this car park. Geotechnical/geophysical data enable us to identify the principal rupture plane at ~40 m of depth. The analysis of the temporal series indicates non-linear displacement rates generally correlated with rainfall events and/or seasonal variations. © Springer-Verlag Berlin Heidelberg 2013.