Figure 4

Thermal model. (a) Computed thermal section before the 1538 eruption; black dashed lines, SV1 and SV3 boreholes. (b) Same as (a) but around 1950. (c) Same as (b) but shortly before 1980; black circles, well located (rms < 0.05) earthquakes from 1982 to 2000⁴⁸; black pluses, well located earthquakes from 2000 to 2014⁴⁸. (d) Dots, SV1 and SV3 temperature data; dashed lines, computed temperature profile at SV1 and SV3 around the half of the 20^th century.