Figure 2. Radar backscatter images of Calbuco volcano on the 14th and 26th April 2015.

Radar backscatter images of Calbuco volcano on the 14th and 26th April 2015. Differences between the two images are due to changes in the scattering and reflecting properties of the ground, caused by the deposition of explosive deposits and removal of material at the volcano’s crater [Ebmeier].