Surface deformation time series and source modeling for a volcanic complex system based on satellite wide swath and image mode interferometry: The Lazufre system, central Andes |
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Authors: | Jan Anderssohn Mahdi Motagh Thomas R. Walter Hermann Kaufmann |
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Affiliation: | a Deutsches GeoForschungsZentrum Potsdam, Department 1 Geodesy and Remote Sensing, D-14473 Potsdam, Germany b Deutsches GeoForschungsZentrum Potsdam, Department 2 Physics of the Earth, D-14473 Potsdam, Germany c Department of Surveying and Geomatics Engineering, University of Tehran, Theran, Iran d Deutsches GeoForschungsZentrum Potsdam, Department 3 Geodynamics, D-14473 Potsdam, Germany |
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Abstract: | 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 km 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. |
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Keywords: | ScanSAR InSAR Time series analysis Surface deformation Source modeling |
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