Fig. 6
Dispersal of volcanic CO2 in Pozzuoli-Solfatara zone (cell size 10 m). The maps were generated in Qgis 3.34 environment (https://qgis.org/download/) using Measurement interpolation generated in SAGA GIS environment (https://saga-gis.sourceforge.io/en/index.html). (a) CO2 concentration map that shows the CO2 concentration excess above the reference background. The concentration excess value of 75 ppm vol has been set as the threshold for transparency. (b) Wind vectors and speed recorded at C.N.R. station. (c) Wind direction frequency during survey. (d) Vertical profile (black line in subplot a) of the excess CO2 concentration across Pozzuoli-Solfatara area.
