2009-2013 ground deformation at Mt Etna observed with advanced DInSAR: Results and Modelling

Jose Fernandez, Institute of Geosciences (CSIC-UCM), Calle del Doctor Severo Ochoa, 7. Facultad de Medicina (Edificio Entrepabellones 7 y 8, 4ª planta) Ciudad Universitaria., Madrid, Spain, Sergey V Samsonov, Natural Resources Canada, Ottawa, ON, Canada, Antonio G. Camacho, Institute of Geosciences (CSIC-UCM), Plaza de Ciencias 3, 28040, Madrid, Spain, Kristy French Tiampo, University of Colorado at Boulder, CIRES, Department of Geological Sciences, Boulder, United States and Pablo J González, University of Leeds, COMET, School of Earth and Environment, Leeds, United Kingdom

Contact First Author: Jose Fernandez; jft@mat.ucm.es

Previously Published Material: Preliminary results will be presented at the 9th International Workshop Fringe 2015 Advances in the Science and Applications of SAR Interferometry and Sentinel-1 InSAR Workshop,  Frascati, Italy between 23 and 27 March 2015.

Abstract ID#: 34105

 

English Abstract:
For studying ground deformation at Mt Etna we collected ascending and descending RADARSAT-2 Standard-3 (S3) data spanning January 2009 – June 2013. The advanced multidimensional small baseline subset method (MSBAS, Samsonov & d’Oreye, 2011) was used to obtain EW and vertical time series of ground deformation. Vertical deformation map revealed localized subsidence and horizontal deformation map revealed broad east-west motion at the fault located north of the volcano with rates <2 cm/year. The nonlinear inversion methodology by Camacho et al. (2011) was used for modeling 3D pressure and mass sources with a free geometry. The method assumes simple homogenous elastic conditions, and models the size and location of pressure/mass sources in a general model, fitting the entire geodetic data set within some regularity conditions. The approach (Camacho et al., 2011; Samsonov et al., 2014) works as a growth process that constructs a very general geometrical configuration. A general framework for the geometry of anomalous bodies is achieved by partitioning the subsurface volume into a dense 3-D grid of point sources. The geometrical description of the extended sources is developed by aggregation of point sources in a 3-D context, allowing for a very general description of the free geometry for the source bodies. For simplicity, it is assumed that anomalous pressure changes are nearly homogeneous within the sources. The inversion process fills cells with the prescribed pressure value (and/or density anomaly), giving rise to the aggregation structure. The nonlinear search is based on an exploratory approach. Simultaneously regional deformation patterns and sliding displacements are obtained. Measured displacement and modeling results are described.

 

References

Camacho, A. G., et al., 2011, doi: 10.1029/2010JB008165.

Samsonov S. & d’Oreye N., 2012, doi: 10.1111/j.1365-246X.2012.05669.x.

Samsonov, S. V., et al., 2014, doi: 10.1002/2014GL060595.

Back to: Volcanoes and Volcanism Posters