Spatial distribution of soil radon as a tool to recognize active faulting on an active volcano: the example of Mt. Etna (Italy)

► We performed measurements of radon from soil carried out on Mt. Etna. ► The sampled zone is characterized by the presence of numerous active faults. ► Radon mapping reveal dangerous hidden faults buried by recent soil cover. ► Our study gives some hints on the source of gas and on fault dynamics. ► We recognized areas where radon activity represents a hazard to the population.