Determinazione della struttura interna del rock glacier di Val Pisella (Alta Valtellina) attraverso sondaggi elettrici verticali. Risultati e problemi

Structure determination of the Val Pisella Rock Glacier (Upper Valtellina,Italy) by means of geoelectrical soundings. Results and problems

Abstract

Some electrical resistivity surveys were performed on the Val Pisella Rock Glacier (Upper Valtellina, Italy) in the summer of 1989; the main objectives were to detect ice and to determine its nature. All the survey shown high values of resistivity (more than 100 000 Ωm with a maximum around 1 000 000 Ωm). According to these results the rock glacier contains permafrost in the form of an ice-cemented core of varying ice content; the maximum permafrost thickness is around 5 m. Therefore the rock glacier can be considered an ice-cemented one.