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The volcanic gas concentrations in the lower layers of the atmosphere are calculated by means of a 3-D meteorological numerical code for coplex terrain, coupled with a Lagrangian dispersion model. This model-chain method provides hazard maps for selected large-scale wind conditions, and permits the estimation of the risk both for actual and increased output rates, turning out to be a useful tool for civil protection management. It is here successfully applied to the case of Vulcano island, and it can be likewize employed in analogous cases around the world, such as the Phlegraen Field, the Paos volcano or the Roturoa volcano.

According to the simulations, the risk at vulcano is mainly related to the SO(2) from crater fumaroles and to the diffuse soil emanations of CO(2) in the plain. Their output rates have been oscillating by orders of magnitude in the last decades, and if they increased by one order of magnitude compared with the peak values of a few years ago, the gas concentrations would reach dangerous thresholds for the people at the Vulcano Porto village. .

Additional information

Authors: PARESCHI M T, CNR Piza (IT);RANCI M, CNR Piza (IT);VALENZA M, Palermo University, Palermo (IT);GRAZIANI G, Environment Institute, JRC Ispra (IT)
Bibliographic Reference: Article: Geophysical Research Letters, 1998
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