Mapping inflation at Santorini volcano, Greece, using GPS and InSAR

Authors

  • I. Papoutsis,

    Corresponding author
    1. School of Rural and Surveying Engineering, National Technical University of Athens, Athens, Greece
    2. Institute for Astronomy, Astrophysics, Space Applications and Remote Sensing, National Observatory of Athens, Athens, Greece
    • Corresponding author: I. Papoutsis, School of Rural and Surveying Engineering, National Technical University of Athens, Iroon Polytechniou 9, 15780 Zografou, Athens, Greece. ipapoutsis@noa.gr

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  • X. Papanikolaou,

    1. School of Rural and Surveying Engineering, National Technical University of Athens, Athens, Greece
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  • M. Floyd,

    1. Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA
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  • K. H. Ji,

    1. Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA
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  • C. Kontoes,

    1. Institute for Astronomy, Astrophysics, Space Applications and Remote Sensing, National Observatory of Athens, Athens, Greece
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  • D. Paradissis,

    1. School of Rural and Surveying Engineering, National Technical University of Athens, Athens, Greece
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  • V. Zacharis

    1. School of Rural and Surveying Engineering, National Technical University of Athens, Athens, Greece
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Abstract

[1] Recent studies have indicated that for the first time since 1950, intense geophysical activity is occurring at the Santorini volcano. Here, we present and discuss the surface deformation associated with this activity, spanning from January 2011 to February 2012. Analysis of satellite interferometry data was performed using two well-established techniques, namely, Persistent Scatterer Interferometry (PSI) and Small Baseline Subset (SBAS), producing dense line-of-sight (LOS) ground deformation maps. The displacement field was compared with GPS observations from 10 continuous sites installed on Santorini. Results show a clear and large inflation signal, up to 150 mm/yr in the LOS direction, with a radial pattern outward from the center of the caldera. We model the deformation inferred from GPS and InSAR using a Mogi source located north of the Nea Kameni island, at a depth between 3.3 km and 6.3 km and with a volume change rate in the range of 12 million m3 to 24 million m3 per year. The latest InSAR and GPS data suggest that the intense geophysical activity has started to diminish since the end of February 2012.

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