Journal
REMOTE SENSING OF ENVIRONMENT
Volume 113, Issue 10, Pages 2062-2075Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.rse.2009.05.004
Keywords
ScanSAR; InSAR; Time series analysis; Surface deformation; Source modeling
Funding
- German Ministry of Education and Research (BMBF)
- German Research Foundation (DFG) [03G0594, MO 1851/1-1]
- TIPTEQ (from The Incoming Plate to megaThrust EarthQuakes)
- Emmy Noether Program [DFG WA1642/1-4]
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The variable spatio-temporal scales of Earth's surface deformation in potentially hazardous volcanic areas pose a challenge for observation and assessment. Here we used Envisat data acquired in Wide Swath Mode (WSM) and Image Mode (IM) from ascending and descending geometry, respectively, to study time-dependent ground uplift at the Lazufre volcanic system in Chile and Argentina. A least-squares adjustment was performed on 65 IM interferograms that covered the time period of 2003-2008. We obtained a clear trend of uplift reaching 15-16 cm in this 5-year interval. Using a joint inversion of ascending and descending interferograms. we evaluated the geometry and time-dependent progression of a horizontally extended pressurized source beneath the Lazufre volcanic system. Our results hence indicate that an extended magma body at a depth between 10 and 15 kin would account for most of the ground uplift The maximum inflation reached up to -40 cm during 2003-2008. The lateral propagation velocity of the intrusion was estimated to be nearly constant at 5-10 km/yr during the observation time, which has important implications for the physical understanding of magma intrusion processes. (C) 2009 Elsevier Inc. All rights reserved.
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