Joint Modelling and Monitoring on Case Pennetta and Case Costa Active Landslides System Using Electrical Resistivity Tomography and Geotechnical Data

The aim of this paper is to study the Case Costa and Case Pennetta active landslides complex in the Northern Apennines (Parma, Italy). A ground model of an active and complex landslide system in instability prone rocks, made mainly by sandstones and claystones (Scabiazza Sandstones, Ligurian Unit), is developed through an integrated approach, utilizing geophysical, geotechnical and remote sensing investigative methods. The latter provides for the integration of more monitoring tools, both traditional (i.e. piezometers and inclinometers), and innovative techniques for the acquisition of electrical tomographic data in time-lapse mode (TL-ERT). The latter has many practical applications to the study of subsurface properties and processes. This approach will allow to create a model of the physical state of the complex landslides and of the groundwater circulation, allowing to observe its variation with time by relating it to the kinematics of the landslide bodies. Results of the landslide investigation reveal that an integrated approach centred on volumetric geophysical imaging successfully achieves a detailed understanding of structure and lithology of a complex landslide system, which cannot be achieved through the use of remotely sensed data or discrete intrusive sampling alone. This paper describes this multi-technique approach for landslide hazard assessment reporting the preliminary monitoring results; such approach seems to be applicable to other hazardous earthworks and natural slopes.