Furnas and Ribeira Quente villages are located inside the caldera
and in the southern flank of the volcano, respectively. According to
the last census (Census, 2011), the two villages have 2206 inhabitants
and 1341 buildings. Studies performed at Furnas Volcano
since the nineties showed CO2 degassing anomalies extending
below Furnas and Ribeira Quente villages (Baxter et al., 1999;
Viveiros et al., 2010, 2012).