Pierre Briole1, Panagiotis Elias2, Giuseppe Puglisi3, Makoto Murakami4

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Presentation transcript:

Pierre Briole1, Panagiotis Elias2, Giuseppe Puglisi3, Makoto Murakami4 Ground deformation at Etna and MiyakeJima from interferometric PALSAR ALOS data Pierre Briole1, Panagiotis Elias2, Giuseppe Puglisi3, Makoto Murakami4 (1) Ecole Normale Supérieure, (2) National Observatory Athens, (3) Istituto Nazionale di Geofisica e Vulcanologia, (4) Hokkaido University ALOS PI Symposium 2008

Etna recent lava flows

ERS SAR interferogram 1995-1999 J.L. Froger 2000 Data processed with Diapason software

PS-Insar at Etna Offset across the Pernicana fault measured by PS-InSAR and in the field PS processing: TRE 2002

2006: inflation and eruption in September Inflation before the eruption of Sept 4, 2006 Processing: ROI-PAC filtered, INGV 2007 ENVISAT 11 May 2005 – 26 April 2006

2007: summit eruptions, inflation, creep along faults April 2007 summit activity Ground deformation from GPS data Processing at INGV-CT with ROI-PAC and GAMIT ENVISAT - 7 Nov 2007 – 26 Mar 2008

11 available ascending PALSAR scenes eruption

ALOS 30 Oct 2007 – 15 Dec 2007 (245m)

ALOS 27 Jan 2007 – 16 Sept 2008 (1309m)

Creep along Pernicana fault

27/1/2007 – 16/9/2008 (18 months)

Coherence and subsidence of lava flows

30/10 – 15/12 2007 (1.5 months)

27/1/2007 – 16/9/2008 (18 months)

Valle del Bove (2006 & 2008 eruptions area)

30/10 – 15/12 2007 (1.5 months)

27/1/2007 – 16/9/2008 (18 months)

MiyakeJima volcano Last eruptions : 1940, 1962, 1983, 2000

Ground motion 1998-2008 (horizontal) GSI, 2008

Ground motion 1998-2008 (vertical) GSI, 2008

Ground motion 2007-2008 (horizontal) GSI, 2008

Ground motion 2007-2008 (vertical) GSI, 2008

8 available ascending PALSAR scenes

8 available descending PALSAR scenes

MiyakeJima volcano

30 Oct 07 – 15 Dec 07 – A.261m (1.5 months)

11 Sep 06 – 30 Jul 07 – A.625m (10.5 months)

12 Sept 06 – 17 Sept 08 – D.280m (24 months)

Conclusions No ground motion detected at MiyakeJima volcano Various phenomena at Etna, like with Cband observations (classical or PS) but coherence better in all types of surfaces All baselines work but much better results with short baselines 3-4mm detectability for SW with standard software (close to Cband), LW detectability linked to atmosphere (like in Cband) Ascending PALSAR data acquired regularly would be great for ground deformation monitoring Quick-looks at http://idaios.space.noa.gr/pub/

Thanks to JAXA for having Yes, we can! Thanks to JAXA for having made ALOS