Gravity observations on Santorini island (Greece): Historical and recent campaigns

Santorini is located in the central part of Hellenic Volcanic Arc (South Aegean Sea) and well known for Late-Bronze-Age “Minoan” eruption that may have been responsible decline great Minoan civilization on island Crete. To use gravity to probe internal structure volcano determine whether there are temporal variations due near surface changes, we construct two maps. Dionysos Satellite Observatory (DSO) National Technical University Athens (NTUA) carried out terrestrial measurements December 2012 September 2014 at selected locations Thera, Nea Kameni, Palea Therasia, Aspronisi Christiana islands. Absolute values were calculated using raw data every station all datasets. The results compared with performed July 1976 by DSO/NTUA absolute derived from Military Geographical Service (HMGS) other sources. Marine collected during PROTEUS project November 2015 fill between land An appropriate Digital Elevation Model (DEM) topographic bathymetric was also produced. Finally, based combined datasets (one 2012–2014 one 1970s), Free air complete Bouguer anomaly maps produced following corrections reductions. pattern consistent seismological within caldera. Finally comparison made same place, found that, caldera, inner process ongoing both before, after, unrest period 2011–2012.