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, 2006Processing: ROI-PAC filtered, INGV 2007

ENVISAT 11 May 2005 – 26 April 2006

2007: summit eruptions, inflation, creep along faults

ENVISAT - 7 Nov 2007 – 26 Mar 2008 Processing at INGV-CT with ROI-PAC and GAMIT

Ground deformation from GPS data

April 2007 summit activity

11 available ascending PALSAR scenes

erup

tion

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 havingmade ALOS