We detect inflation of Cerro Hudson volcano following its 1991 eruption, and use spherical and non-spherical models to constrain the source of deformation to be between 4 and 8 km below sea level. We measure the rate of deformation to be about 5 cm/year in the radar line-of-sight, and infer that the maximum deformation could exceed 10 cm/year in the center of the caldera Ref 1.
Deformation at Cerro Hudson is difficult to observe because of decorrelation in both the C and L band data (Figure 9), but Envisat data spanning 2004–2008 shows about 2 cm/yr of inflation (Figure 9a). The rate and shape of deformation is consistent with the declining rate of deformation and the depth of the magma chamber from Pritchard and Simons [2004b]. Ref 2