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Fifteen years of ERS and ENVISAT DInSAR observations at Mt. Etna, Italy, by using the SBAS approach

Francesco Casu(1,4), Giuseppe Solaro(2), Susi Pepe(1), Paul Lundgren(3), Mariarosaria Manzo(1,5), Antonio Pepe(1), Paolo Berardino(1), Eugenio Sansosti(1) and Riccardo Lanari(1)

(1) IREA-CNR, Via Diocleziano, 328, Napoli, 80124, Italy
(2) INGV-OV, Via Diocleziano, 328, Napoli, 80124, Italy
(3) JPL-CALTECH, 4800 Oak Grove Drive, Pasadena, 91109, United States
(4) DIEE - Università di Cagliari, Piazza D'Armi, 09123, Italy
(5) DIFA-Università della Basilicata, Viale dell'Ateneo Lucano, 10, 85100, Italy

Abstract

Mt. Etna is a large basaltic stratovolcano located on the eastern coast of Sicily (southern Italy). It developed between the Apennine-Maghrebian chain to the north and the Hyblean-Maltese foreland to the south and arose from a succession of central vents and flank eruptions in the last 200 ka [1]. The volcano is characterized by two main deformation patterns [2]: i) a westward motion of the west flank along a south-west and west fault systems and ii) a continuous seaward motion of the eastern and southern flanks that produces extension on its upper part, thus facilitating shallow magma intrusions, and a pronounced bulge along the south-eastern base. Mt. Etna has been the subject of several conventional [3]-[4] and advanced [2] Differential SAR Interferometry (DInSAR) studies aimed to detect and analyze its deformation dynamics. In this work we extend the analysis proposed in [2], focused on the 1992-2001 time interval, by applying the Small BAseline Subset (SBAS) approach [5] to a 15 years SAR data set acquired by the ERS and ENVISAT satellites. In particular, we take advantage of the SBAS multi-sensor DInSAR capability [6] which allows us to generate mean deformation velocity maps and corresponding time series by jointly exploiting SAR images collected by the ERS and ENVISAT SAR sensors. We also benefit from the use of multi-orbit (ascending and descending) data which permits us not only to detect the ground deformation in the corresponding radar line of sight but also to discriminate the vertical and east-west components of the volcano edifice displacement. The presented results will be focused on investigating the post-2000 complex deformation behavior of Mt. Etna, mainly characterized by the summer 2001 and end of 2002 large eruptive episodes. Moreover, we will also exploit the possibility to invert the retrieved DInSAR products in order to model both deep geological structures and magmatic sources, representing a relevant issue for the comprehension of the volcano dynamics.

References

[1] D. Rust, B. Behncke, M. Neri, and A. Ciocanel, "Nested zones of instability in the Mount Etna volcanic edifice, Italy", Journ. Volcan. Geoth. Res., vol. 144, pp. 137-153, 2005. [2] P. Lundgren, F. Casu, M. Manzo, A. Pepe, P. Berardino, E. Sansosti and R. Lanari, "Gravity and magma induced spreading of Mount Etna volcano revealed by satellite radar interferometry," Geophys. Res. Lett , vol. 31, L04602, 2004. [3] D. Massonnet, P. Briole, and A. Arnaud, "Deflation of Mount Etna monitored by spaceborne radar interferometry," Nature, vol. 375, pp. 567-570, June 1995. [4] A. Borgia, R. Lanari, E. Sansosti, M. Tesauro, P. Berardino, G. Fornaro, M. Neri, and J. Murray, "Actively growing anticlines beneath Catania from the distal motion of Mount Etna's decollement measured by SAR interferometry and GPS," Geophys. Res. Lett., vol. 27, pp. 3409-3412, Oct. 2000. [5] P. Berardino, G. Fornaro, R. Lanari, and E. Sansosti, "A new Algorithm for Surface Deformation Monitoring based on Small Baseline Differential SAR Interferograms," IEEE Trans. Geosci. Remote Sens., vol. 40, pp. 2375-2383, November 2002. [6] A. Pepe, E. Sansosti, P. Berardino and R. Lanari, "On the Generation of ERS/ENVISAT DInSAR Time-Series via the SBAS technique," IEEE on Geoscience and Remote Sensing Letters, vol. 2(3), pp. 265-269, 2005.

 

Workshop presentation

Keywords: ESA European Space Agency - Agence spatiale europeenne, observation de la terre, earth observation, satellite remote sensing, teledetection, geophysique, altimetrie, radar, chimique atmospherique, geophysics, altimetry, radar, atmospheric chemistry