ERS-2 views of Etna moving

ERS-derived images of the volcano Etna in Italy, summer 2001. Using precise techniques known as SAR Interferometry (InSAR), researchers have been able to monitor the movements of Etna for over 10 years including the eruption in 1993. A digital terrain model of the volcano and measurements of geophysical parameters, such as the volcanic mouth deflation, were already generated in 1995 by making use of complex interferometric techniques applied to ERS SAR images. ERS-2 SAR image data were then collected and processed to analyse the 2001 eruption.