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Permafrost interacts with climate by reacting with aggradation or degradation processes, ultimately causing the increase/decrease of its thickness. The transformations of the state of permafrost affecting alpine slopes are critical to people and to ecosystems. They induce slope instability and changes in geomorphic processes (e.g. floods) and related hazard scenarios. Moreover, the long-term reservoirs of frozen water represented by permafrost-affected terrains are likely to become increasingly important water reservoir under ongoing global-warming. Being sensitive to internal ice formed under prolonged sub-zero temperatures, Electrical Resistivity Tomography (ERT), Ground-Penetrating Radar (GPR) are methods commonly adopted to detect permafrost in mountain detritical slopes. Rock glaciers (i.e. slow flowing mixtures of debris and ice in variable proportion) are the clearest, most abundant and studied permafrost-related landforms in mountain regions. In this seminar some applications (survey strategies, results and interpretations) of ERT and GPR surveys for permafrost detection in rock glaciers are illustrated.