Kinematics of Active Landslides in Achaia (Peloponnese, Greece) through InSAR Time Series Analysis and Relation to Rainfall Patterns  
[PERSON]  
1 National Observatory of Athens, Institute of Geodynamics, Lofos Nymfon, Tmission, 11810 Athens, Greece; [EMAIL_ADDRESS] (A.G.);[EMAIL_ADDRESS] (I.K.); [EMAIL_ADDRESS] (E.E.)  
[PERSON]  
1 National Observatory of Athens, Institute of Geodynamics, Lofos Nymfon, Tmission, 11810 Athens, Greece; [EMAIL_ADDRESS] (A.G.);[EMAIL_ADDRESS] (I.K.); [EMAIL_ADDRESS] (E.E.)  
[PERSON]  
1 National Observatory of Athens, Institute of Geodynamics, Lofos Nymfon, Tmission, 11810 Athens, Greece; [EMAIL_ADDRESS] (A.G.);[EMAIL_ADDRESS] (I.K.); [EMAIL_ADDRESS] (E.E.)  
[PERSON]  
1 National Observatory of Athens, Institute of Geodynamics, Lofos Nymfon, Tmission, 11810 Athens, Greece; [EMAIL_ADDRESS] (A.G.);[EMAIL_ADDRESS] (I.K.); [EMAIL_ADDRESS] (E.E.)  
[PERSON]  
1 National Observatory of Athens, Institute of Geodynamics, Lofos Nymfon, Tmission, 11810 Athens, Greece; [EMAIL_ADDRESS] (A.G.);[EMAIL_ADDRESS] (I.K.); [EMAIL_ADDRESS] (E.E.)  
[PERSON]  
1 National Observatory of Athens, Institute of Geodynamics, Lofos Nymfon, Tmission, 11810 Athens, Greece; [EMAIL_ADDRESS] (A.G.);[EMAIL_ADDRESS] (I.K.); [EMAIL_ADDRESS] (E.E.)  
[PERSON]  
1 National Observatory of Athens, Institute of Geodynamics, Lofos Nymfon, Tmission, 11810 Athens, Greece; [EMAIL_ADDRESS] (A.G.);[EMAIL_ADDRESS] (I.K.); [EMAIL_ADDRESS] (E.E.)  
[PERSON]  
1 National Observatory of Athens, Institute of Geodynamics, Lofos Nymfon, Tmission, 11810 Athens, Greece; [EMAIL_ADDRESS] (A.G.);[EMAIL_ADDRESS] (I.K.); [EMAIL_ADDRESS] (E.  
Landslide phenomena have been previously recognized and mapped in Greek territory using InSAR techniques. Recently, [PERSON] et al. [8] used interferometric processing of TerraSAR-X data to estimate ground displacement rates of a large landslide inside a coal mine in western Macedonia; [PERSON] et al., [4] produced susceptibility maps for the landslides in western Greece using ERS/ENVISAT data; [PERSON] et al. [5] used ERS/ENVISAT/Sentinel-1 data to monitor slope stability upstream from an artificial dam; [PERSON] et al., [9] examined the identification of mass movements due to landslides on Lefkada island with InSAR time series analysis using the TERRAFIRMA data (produced by the persistent scatterers interferometry--PSI technique). [PERSON] & [PERSON], [10] mapped the landslides south of Patras using interferometric processing (offset-tracking method); several other studies on critical locations used InSAR technology [11; 12].  
The Achaia prefecture in NW Peloponnese (Greece), is an area strongly affected by localized subsidence and landslides [7; 13; 14; 15; 16; 17; 18], especially the mountainous area near the villages of Krini, Pititsa and Sella (Figure 1; [15; 19]). These villages are located on the north-facing slopes of the mountain Panachaiko (maximum elevation 1926 m; Figure 1a), and all of them are affected by active landslide phenomena [20]. The NW Peloponnese shows spatially and temporally diverse climatic conditions across its area, mostly due to irregular topography and different atmospheric circulation patterns. Overall, the climate is typical Mediterranean and exhibits large seasonal variations with mild, wet winters and hot, dry summers [21]. The wet period usually extends from October through May [17].  
In this study we used Sentinel-1 (C-band) InSAR displacement data to map the active landslides and monitor their kinematics. We compared our InSAR results to a co-located GNSS station at one of the sites. We then cross-correlated our InSAR time series to the rainfall data from a nearby meteorological station of NOA. We demonstrated a robust correlation between maximum rainfall and an increase in displacement rates.