GNGTS 2013 - Atti del 32° Convegno Nazionale

P. Heath, G. Heinson, S. Greenhalgh: (2003): Some comments on potential field tensor data , Exploration Geophysics, 34 , 57–62. P. Palangio (1998): A broad band two axis flux-gate magnetometer , Annali di Geofisica, Vol. 41, N. 3, August. P. Schmidt, D.A. Clark (2000): Advantages of measuring the magnetic gradient tensor , Preview, 85 , 26–30. H. Wilson (1985): Analysis of the magnetic gradient tensor, Defence Research Establishment Pacific, Canada Technical Memorandum , 85-13 , 47. Electrical Resistivity Tomography surveys to investigate the Ivanchic landslide (Assisi, Umbria region, Italy) A. Perrone 1 , J. Bellanova 1 , G. Calamita 1 , F. Ardizzone 2 , S. Piscitelli 1 1 Istituto di Metodologie per l’Analisi Ambientale – CNR, Tito (PZ), Italy 2 Istituto di Ricerca per la Protezione Idrogeologica – CNR, Perugia, Italy Introduction. This paper reports the in-situ geophysical results obtained in the Ivanchic landslide (Assisi, Umbria region), one of the DORIS project test sites (under FP7 grant agreement No. 242212). DORIS (www.doris-project.eu ) is an advanced downstream service for the detection, mapping, monitoring, and forecasting of ground deformations (landslides and ground subsidence), which operates in different study areas (Hungary, Italy, Poland, Spain, and Switzerland). The project aims to integrate traditional and innovative Earth Observation (EO) and ground based (non-EO) data and technologies to improve the understanding of the complex deformation phenomena. The Ivanchic landslide, affecting the eastern part of the Assisi town, was investigated by applying satellite and in-situ geophysical methods. Satellite method allowed the definition of the dynamics occurring on the slope (Ardizzone et al. , 2011). In-situ geophysical measurements, compared with geological and stratigraphical data from previous direct investigations (Angeli and Pontoni, 1999), provided information on subsoil geometrical setting and landslide body characteristics. Geological and geomorphological setting. The Assisi town is located along the NW sector of the Monte Subasio, a distinct physiographical feature in central Umbria, and is bounded to Fig. 1 – A) Map showing terrain in Umbria, Italy. The study area, shown by the red polygon, is located in the Assisi municipality. The blue line shows the area covered by the ERS-1/2 and the ASAR radar images and stars indicate the location of two rain gauges used in a study carried out by Ardizzone et al. (2011). B) Map showing landslides in the Ivancich area. Green polygons are old landslides and purple polygons are recent landslides. Landslide crown areas (darker colors) are shown separately from landslide deposits (lighter colors). Red lines are ERT profiles; green lines are geological sections. 155 GNGTS 2013 S essione 3.2