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Abstract:
Mt. Etna is one of the most closely monitored volcanoes in the world, due to its almost continuous activity and the several hundred thousand people living on its slopes. Its eruptions mainly affect the summit craters, but the great impact on society from its various activities spurred the expansion of both terrestrial and satellite-based ground deformation monitoring networks over the years.We propose a multi-parameter analysis of ground deformation using tilt, high-rate GNSS measurements and DInSAR interferograms recorded during the 2020-2022 lava fountains, to reconstruct the possible shallow feeding system of the volcano that allowed such rapid magma accumulation and discharge. Our analysis showed that the tilt changes are generally similar in magnitude for each episode (between 0.10 and 0.70 microradians) from January to March, while the beginning of the second cycle, from May to June, is characterized by smaller ground deformations, that, only from July, return to typical magnitudes previously measured in the first cycle. Our aim is to identify the differences among the various fountains and between the two cycles by integrating the three different types of ground deformation data for both the first cycle and the second cycle, using tilt data to constrain the sources responsible for each single violent event and the cumulative deformation measured by DInSAR and GNSS solutions to image the deepest part of the source involved in the period.
