Articles | Volume 13, issue 1
Nat. Hazards Earth Syst. Sci., 13, 177–185, 2013
Nat. Hazards Earth Syst. Sci., 13, 177–185, 2013

Research article 28 Jan 2013

Research article | 28 Jan 2013

Evidence of non-extensivity in the seismicity observed during the 2011–2012 unrest at the Santorini volcanic complex, Greece

F. Vallianatos1,2, G. Michas2, G. Papadakis2, and A. Tzanis3 F. Vallianatos et al.
  • 1Laboratory of Geophysics and Seismology, Technological Educational Institute of Crete, Chania, 73133 Crete, Greece
  • 2Institute for Risk and Disaster Reduction, University College London, Gower Street, London, WC1E 6BT, UK
  • 3Department of Geophysics and Geothermy, University of Athens, Panepistimiopoli, 15784 Zografou, Greece

Abstract. During the period of October 2011–January 2012, an increase of earthquake activity has been observed in the volcanic complex of Santorini Island, Greece. Herein, the magnitude distribution of earthquakes as well as the temporal distribution of seismicity are studied. The statistics of both parameters exhibit complexity that is evident in the frequency-magnitude distribution and the inter-event time distribution, respectively. Because of this, we have used the analysis framework of non-extensive statistical physics (NESP), which seems suitable for studying complex systems. The observed inter-event time distribution for the swarm-like earthquake events, as well as the energy and the inter-event earthquake energy distributions for the observed seismicity can be successfully described with NESP, indicating the inherent complexity of the Santorini volcanic seismicity along with the applicability of the NESP concept to volcanic earthquake activity, where complex correlations exist.