ground deformation at etna and miyakejima from interferometric palsar alos data pierre briole 1,...
TRANSCRIPT
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
eru
ptio
n
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
made ALOS