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

Anderssohn, J.; Motagh, Mahdi; Walter, Thomas R.; Rosenau, Matthias; Kaufmann, Hermann; Oncken, Onno

doi:10.1016/j.rse.2009.05.004

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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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Anderssohn, J.
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Motagh, Mahdi
2.1 Physics of Earthquakes and Volcanoes, 2.0 Physics of the Earth, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;
1.4 Remote Sensing, 1.0 Geodesy and Remote Sensing, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

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Walter, Thomas R.
2.1 Physics of Earthquakes and Volcanoes, 2.0 Physics of the Earth, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

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Rosenau, Matthias
3.1 Lithosphere Dynamics, 3.0 Geodynamics and Geomaterials, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

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Kaufmann, Hermann
1.4 Remote Sensing, 1.0 Geodesy and Remote Sensing, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

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Oncken, Onno
3.1 Lithosphere Dynamics, 3.0 Geodynamics and Geomaterials, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

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Citation

Anderssohn, J., Motagh, M., Walter, T. R., Rosenau, M., Kaufmann, H., Oncken, O. (2009): 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. - Remote Sensing of Environment, 113, 10, 2062-2075.
https://doi.org/10.1016/j.rse.2009.05.004

https://gfzpublic.gfz-potsdam.de/pubman/item/item_238962

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.