The course is aimed at examining the physics of volcanic processes with the final goal to get to a better evaluation of volcanic hazards and to discuss the elements and factors that interact in the management of volcanic crises. Particular attention is paid to illustrate methods available for the assessment of principal eruptive parameters of past explosive events: volume, height of eruption column and mass flux and also to methods for the evaluation of parameters of effusive activity, lahar and debris avalanche. The management of volcanic crisis topic will includes the analysis of methods for the forecasting of volcanic phenomena and also the integration of scientific aspects with operational procedure of the volcano crisis management.