The release of hazardous materials induced by natural events affecting industrial facilities presents peculiar
characteristics because of the huge potential extension of the affected areas. The reduction of both the likelihood
and the magnitude of such events represents an essential step to reduce the risk associated with Natech
accidents. Nevertheless, the evaluation of damage to the environment in Natech events has been poorly
addressed. In the present study, past accidents analysis was carried out, using both a detailed description of
specific accidents and an extended database of Natech events. Lessons learnt as well as possible common
patterns and main features related to such accidents were identified and discussed. The results of the present
study can be intended as a preliminary step for the development of models for the quantitative assessment of
damage to the environment in major accidents caused by natural events