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The spatial deformation of the Santorini Complex during the "quiet" period 1992-2010 deduced by joint interpretation of ERS1&2 and ENVISAT images of ascending and descending geometry. This period, Palea Kammeni was getting uplifted (2-3 mm/yr), characterized by an increasing rate of uplift, whilst the adjacent Nea Kammeni was subsided (up to -3 mm/yr) with increasing rates. The above two islets even though they are considered as a single volcanic center they exhibit a different type of vertical motion. The rest of the study area showed a velocity field varying from -1 to +2 mm/yr and sub-millimeter acceleration field values, indicating a linear deformation during this period. Combining ascending and descending radar data, the vertical and horizontal (E-W) component of the velocity field were determined. Several deformation patterns were identified: The two main tectonic features, the Columbo and the Kammeni lines at the northern and central part of the system, the Alpine basement at the SE part of Thera, and a pattern associated with the graben basin at the southern part, consistent to earlier AMT work and the recently compiled Gravity Anomaly Map. The remeasurement periods of the GPS network (established in 1994) resulted in the calculation of the strain field, and velocity deformation patterns consistent to the SqueeSAR analysis results.

 SqueeSAR Results for the period 1992 - 2010 (by T.R.E)


Ground velocity maps of (a) the Vertical, and (b) Horizontal (in E-W direction) components deduced by combining Ascending and Descending data sets (1992-2010).

The deformation study for the “active” period 2011-2012 was based on the SqueeSAR analysis of ENVISAT images of ≈39 deg LOS angle,

(a) Ground LOS velocity (mm/yr) map for the unrest period April 2011 to March 2012 (δ ≈39ο, θ ≈11ο); (b) Standard Deviation of the LOS velocity field;
LOS velocity field focusing at the southern part of Thera (different coloured scale).

SqueeSAR Mogi modelling for the period April 2011 to March 2012. (a) Observed LOS deformation field (mm); (b) Calculated LOS deformation field showing also the location (red dot) of the best-fit source, together with the normalized χ2 error contour lines; (c) Map of residuals (in mm) between observed and calculated values, together with their histogram distribution; (d) Diagram between depth and volume variation for the best fit location. Red contour lines indicate the 90% confidence level.


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