Endangering humans, their values and their activities, the natural or technological disasters enhance crucial questions about social organization: how to cope with, is it possible to get some protection against, how to recover after, what kind of resettlement adopt? The symposium introduces, through various and complementary approaches (architecture, environmental psychology, and planning), examples of specific case study. The main point of this symposium is to underline how research in social sciences could give tools for prevention or recovery to public authorities responsible for safety, land use management, etc