Ground deformation at Etna and MiyakeJima from interferometric PALSAR ALOS data
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Transcript of Ground deformation at Etna and MiyakeJima from interferometric PALSAR ALOS data
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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
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Etna recent lava flows
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ERS SAR interferogram 1995-1999
J.L. Froger 2000 Data processed with Diapason software
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PS-Insar at Etna
Offset across the Pernicana fault
measured by PS-InSAR and in the field
PS processing: TRE 2002
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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
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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
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11 available ascending PALSAR scenes
erup
tion
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ALOS 30 Oct 2007 – 15 Dec 2007 (245m)
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ALOS 27 Jan 2007 – 16 Sept 2008 (1309m)
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Creep along Pernicana fault
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27/1/2007 – 16/9/2008 (18 months)
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Coherence and subsidence of lava flows
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30/10 – 15/12 2007 (1.5 months)
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27/1/2007 – 16/9/2008 (18 months)
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Valle del Bove (2006 & 2008 eruptions area)
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30/10 – 15/12 2007 (1.5 months)
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27/1/2007 – 16/9/2008 (18 months)
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MiyakeJima volcano
Last eruptions : 1940, 1962, 1983, 2000
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Ground motion 1998-2008 (horizontal)
GSI, 2008
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Ground motion 1998-2008 (vertical)
GSI, 2008
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Ground motion 2007-2008 (horizontal)
GSI, 2008
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Ground motion 2007-2008 (vertical)
GSI, 2008
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8 available ascending PALSAR scenes
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8 available descending PALSAR scenes
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MiyakeJima volcano
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30 Oct 07 – 15 Dec 07 – A.261m (1.5 months)
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11 Sep 06 – 30 Jul 07 – A.625m (10.5 months)
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12 Sept 06 – 17 Sept 08 – D.280m (24 months)
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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/
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Thanks to JAXA for havingmade ALOS