Although the current trend in volcanology is the increasing use of physical and mathematical models in order to understand volcanic processes, geology and field observations remain the basis for volcano studies. Mapping in volcanic areas are the basis for detailed volcanological, magmatic studies, computational modeling and for understanding the behavior of volcanoes and their future activity in terms of volcanic hazards for active volcanoes. Accurate forecasting of future volcanic event requires detailed understanding of its past eruptive activity for extrapolating a possible behavior into the future,but is also critical for establishing guidelines for exploring economic and energy resources associated with volcanic systems or for reconstructing the evolution of sedimentary basins in which volcanism has played a significant role.The aim of this session is to present studies in which geological mapping in volcanic areas, stratigraphy and tephrostratigraphy in volcanic successions and volcano geology are essential in the hazard assessment, environmental management and mitigation of the volcanic risk and allow evaluating and exploring geothermal fields and ore geology. This session is under the aegis of the IAVCEI Volcano Geology Commission.