Atmospheric Dispersion of Natural Gases at Volcano Island
Different computational scenarios are analyzed for the evaluation of volcanic CO(2) and SO(2) concentrations in the air over the island of Vulcano (Aeolian Archipelago, North of Sicily). The simulations were done using a 3-dimensional mesoscale meteorological model for complex terrain, local wind depending on differences in land and heating and cooling and on island orography. Flow model outputs were then used by a Lagrangian model to simulate the dispersion of gases emitted from crater fumaroles. Both models were able to reproduce observations gathered. Simulations of the dispersion of gases emitted from the fumaroles of La Fossa cone were performed for selected summertime conditions, when more than 10 000 tourists live in the area of Vulcano Porto. the highest concentrations of gases at Vulcano Porto occur with south easterly winds and no synoptic winds, although present gas emission rates from the crater fumaroles do not involve any hazard for people. Dangerous scenarios were also investigated which are related to a possible paroxysmal event at the north eastern rim of the crater, in the area of La Forgia Vecchia. In this area a depressurization of the system, allied with a possible slope failure, could inject large amounts of gases into the atmosphere.
Bibliographic Reference: Article: Journal of Vulcanology and Geothermal Research
Record Number: 199610027 / Last updated on: 1996-02-16
Original language: en
Available languages: en