## 6 Conclusions  
This study was aimed at providing a further contribution to the knowledge on reactivated and slow-moving landslides. To this purpose, a joint examination of continuous hydrological and geotechnical monitoring data series, acquired in the framework of the long-term monitoring of the Fontane di San Bernardo landslide, was performed. In particular, pore water pressure and subsurface horizontal displacement were measured by means of automatic sensors installed at the positions of dominant movements taking place along the known failure surfaces of the landslide. The study outcomes provided new insight into the kinematics complexity of the investigated landslide and can be so summarized:  
* Over a monitoring period of two and a half years, the landslide activity revealed phases of slow displacements alternated with relative inactivity, both occurring with somewhat regular frequencies, prevalently on a seasonal scale, and characterized by similar durations. These two motion patterns can be interrupted by episodic sharp accelerations.
* The slow-motion phases involved progressive deformations developing at average displacement rates classifiable as \"extremely slow\" (cf., [63]). These movements occurred at a relatively constant pore water pressure regime and were ascribed to viscous shear displacement mechanisms along the failure surface. Inactive phases entailed no significant displacements and mostly corresponded to prolonged periods of dry conditions.
* The acceleration stages produced the largest deformations, occurring with maximum motion rates that can be indexed as \"very slow\" (cf., [63]). The fastest displacements were triggered by pore water pressure peaks driven by multi-day periods of significant rainfall and were associated with sliding mechanisms taking place through a rigid-plastic frictional behaviour.
* A relatively slow hydrological response was observed along the failure surface as pore water pressure peaks took several days to form. Moreover, hysteresis relationships between pore water pressure and landslide displacement were found. These latter outcomes revealed complex hydro-mechanical behaviour of the landslide that should be explored with further investigations and monitoring.  
In conclusion, this study provided compelling evidence of the usefulness of geotechnical equipment installed in direct contact with sliding zones to outline the factors that can prepare to the mobility of reactivated and slow-moving landslides. Furthermore, this study can provide a valuable contribution to set up and calibrate hydro-mechanical models aimed at simulating kinematics evolution of the Fontane di San Bernardo landslide and, therefore, helps to develop an early warning system for civil protection purposes.  
Conceptualization, G.P. and A.C.; methodology, G.P., A.C., B.M. and G.R.; formal analysis, G.P., G.V., E.A. and A.G.; investigation, G.P., A.V., E.A., A.G., G.V., B.M. and G.R.; data curation, G.P., B.M. and G.R.; writing--original draft preparation, G.P. and A.C.; writing--review and editing, G.P. and A.C.; visualization, G.P. and A.C.; supervision, G.P. and A.C.; project administration, G.P.; funding acquisition, G.P. All authors have read and agreed to the published version of the manuscript.  
This study was carried out within the RETURN Extended Partnership and received funding from the European Union Next-GenerationEU (National Recovery and Resilience Plan--NRRP, Mission 4, Component 2, Investment 1.3--D.D. 1243 2/8/2022, PE0000005).  
Data Availability StatementData are not publicly available due to privacy reasons.  
The authors thank the Sestri Levante Municipality for providing monitoring data time series. The authors would like also to thank the two anonymous reviewers for their helpful comments and suggestions that improved this paper.  
The authors declare no conflicts of interest.