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AGU: Geophysical Research Letters

 

Keywords

  • GPS
  • Seismicity
  • Volcano deformation
  • modeling

Index Terms

  • 1207 - Transient deformation
  • 1211 - Non-tectonic deformation
  • 4302 - Geological
  • 8419 - Volcano monitoring

Paper in Press

GEOPHYSICAL RESEARCH LETTERS, doi:10.1029/2012GL051286

Recent Geodetic Unrest at Santorini Caldera, Greece

Key Points
  • Santorini is deforming appreciably for the 1st time since its last eruption
  • A dense GPS network has unprecedented data coverage
  • Activity is centered in the region that blew-out in the 1650 BC Minoan Eruption

Authors:

Andrew V. V Newman

Stathis Stiros

Lujia Feng

Panos Psimoulis

Fanis Moschas

Vasso Saltogianni

Yan Jiang

Costas Papazachos

Dimitris G. Panagiotopoulos

Eleni Karagianni

Dominikos Vamvakaris

After approximately 60 years of seismic quiescence within Santorini caldera, in January 2011 the volcano reawakened with a significant seismic swarm and rapidly expanding radial deformation. The deformation is imaged by a dense network of 19 survey and 5 continuous GPS stations, showing that as of 21 January 2012, the volcano has extended laterally from a point inside the northern segment of the caldera by about 140 mm and is expanding at 180 mm/yr. A series of spherical source models show the source is not migrating significantly, but remains about 4 km depth and has expanded by 14 million m3 since inflation began. A distributed sill model is also tested, which shows a possible N-S elongation of the volumetric source. While observations of the current deformation sequence is unprecedented at Santorini, it is not certain that an eruption is imminent as other similar calderas have experienced comparable activity without eruption.

Received 8 February 2012; accepted 6 March 2012.

Citation: Newman, A. V. V., et al. (2012), Recent Geodetic Unrest at Santorini Caldera, Greece, Geophys. Res. Lett., doi:10.1029/2012GL051286, in press.