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Remote sensing for Ground Deformation analysis during the eruptive event of July 2001 at Mt. Etna

Remote sensing for Ground Deformation analysis during the eruptive event of July 2001 at Mt. Etna. Alessandro Bonforte (1), Carlo Colesanti (2), Alessandro Ferretti (3), Francesco Guglielmino (1), Mimmo Palano (4) , Claudio Prati (2), Giuseppe Puglisi (1) and Fabio Rocca (2).

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Remote sensing for Ground Deformation analysis during the eruptive event of July 2001 at Mt. Etna

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  1. Remote sensing for Ground Deformation analysis during the eruptive event of July 2001 at Mt. Etna Alessandro Bonforte (1), Carlo Colesanti (2), Alessandro Ferretti (3), Francesco Guglielmino (1), Mimmo Palano (4) , Claudio Prati (2), Giuseppe Puglisi (1) and Fabio Rocca (2) (1) Istituto Nazionale di Geofisica e Vulcanologia, Piazza Roma, 2, 95123 Catania, Italy (2) POLIMI-DEI, Piazza Leonardo da Vinci, 32, 20133 Milano, Italy(3) Tele-Rilevamento Europa S.r.l., via Vittoria Colonna, 7, 20149 Milano, Italy(4) Università degli Studi di Catania, Corso Italia, 55, 95129 Catania, Italy

  2. The 2001 Mt. Etna eruption Dyke emplacement

  3. The 2001 Mt. Etna eruption Lava flows

  4. Ground Deformation Analysis • All GPS surveys available from July 2000 to 2001 • All ERS passes from 2000 to 2001 Data provided by:

  5. Before the eruption • July 2000 (all the network) • January 2001 (South-East) • July 2001 (all the network) GPS data During the eruption Available surveys • E-W and N-S kinematic profiles After the eruption • September 2001 (all the network) • October 2001 (South-East)

  6. GPS Data The Mt. Etna Network

  7. Time intervals analysed by GPS and InSAR data

  8. Observed displacements Calculated displacements Before the eruption Pressure source Depth: 6.2 Km b.s.l. Strength: 1280*105 GPa*m3 Sub-horizontal plane E Strike slip: 0.82 cm sx Dip slip: 2.75 cm normal Sub-horizontal plane S Strike slip: 0.5 cm sx Dip slip: 0.5 cm normal GPS Displacements between July 2000 and July 2001

  9. Tropospheric effects Before the eruption InSAR Displacements between 30 August 2000 - 13 December 2000 (asc.) Removal of a different vertical tropospheric profile between the two passes

  10. Sub-horizontal plane Strike slip: 0.4 cm dx Dip slip: 0.6 cm normal Moscarello fault Strike slip: 0.9 cm sx Dip slip: 0.3 cm (East up) S. Leonardello fault Strike slip: 0 Dip slip: 2.9 cm (East up) Before the eruption GPS Displacements between January and July 2001

  11. Before the eruption InSAR Displacements between June 6 –July 11 2001 (ascending)

  12. Sources modelled by GPS data from July 2000-July 2001 interval Before the eruption Synthetic ascending interferogram from the sources modelled by GPS Refinement: Mogi source 1 Km shallower and moved 1 Km southward; strength reduced to +800*105 Gpa*m3

  13. Before the eruption GPS Displacements between 11 and 17 July 2001 (dyke emplacement)

  14. Dyke Length: 2.2 Km Height: 2.3 Km Depth of top: 1.6 Km a.s.l. Dip angle: 90° Strike slip: 4 cm sx Dip slip: 3 cm (E up) Opening: -5 cm SE Fault Length: 1.9 Km Height: 2.5 Km Depth of top: 1 Km a.s.l. Dip angle: 73° E Strike slip: 40 cm dx Dip slip: 13 cm normal Opening: 18 cm During the eruption GPS Displacements from 25 to 27 July 2001

  15. During the eruption InSAR Displacements between July 11 – August 15 2001 (ascending)

  16. Observed displacements Calculated displacements Dyke Depth: 1.6 Km a.s.l. Dip: 90° Strike slip: 0 Dip slip: 0 Opening: 251.7 cm SE fault Depth: 1 Km a.s.l. Dip: 73°E Strike slip: 40 cm dx Dip slip: 13 cm normal Opening: 18 cm Sub-horizontal plane E Strike slip: 0.8 cm sx Dip slip: 2.6 cm normal During the eruption GPS Displacements between July and September 2001 Displacements decrease from higher to lower stations

  17. Sources modelled by GPS data from July - September 2001 interval During the eruption Synthetic ascending Interferogram from July to August 2001

  18. After the eruption Sub-horizontal plane Strike-slip: 0.3 cm dx Dip-slip: 2.4 cm normal Moscarello fault Strike-slip: 1.8 cm dx Dip slip: 1 cm (East up) S. Leonardello fault Strike-slip: 0.1 cm sx Dip-slip: 2.6 cm (East up) GPS Displacements between September and October 2001 Displacements increase from higher to lower stations

  19. During the eruption October 11 2000 – October 31 2001 InSAR Displacements between Oct/Nov 2000 - October 2001 (descending) November 15 2000 – October 31 2001

  20. Sources modelled by all previous inversions. Strength now is -2560*105 GPa*m3. Sliding resulting from the sum of each time interval previously investigated Before and During the eruption Synthetic descending interferogram between November 2000 - October 2001 Refinement: Mogi source moved 1 Km westwards

  21. Sliding increased during and after the eruption: 2.7 cm during July 2000 - July 2001 (1 year) 2.6 cm during July – September 2001 (2 months) 2.4 cm during September – October 2001 (1 month) Summary Depressurisation (pressure*volume) estimated by InSAR from November 2000 to October 2001 is about two times stronger than the pressurisation modelled from July 2000 to July 2001 Sources modelled by GPS and InSAR data

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