Hazard From Endogenous Gas Emissions and Phreatic Explosions in Rome City (Italy)

A gas blowout during an unauthorized well drilling occurred on June 9, 2020 at the Rome-Ciampino boundary periphery of Colli Albani quiescent volcano. This zone hosts a shallow confined gas-pressured aquifer, which recently produced further three blowouts. Dangerous atmospheric CO2 and H2S concentrations killed some birds, 12 families were evacuated. The helium isotopic composition indicates that has magmatic origin. It rises toward surface along leaky faults, pressurizing aquifer creating permanent hazard. volcano is characterized by anomalous uplift, release gas, episodic seismic crises. Should volcanic unrest occur, hazard would increase in this densely inhabited Rome city, as input into might create overpressure conditions leading to harmful phreatic explosion, or emission hazardous through newly created fractures.