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The 2011-2012 unrest at Santorini rift: Stress interaction between active faulting and volcanism

Abstract : Santorini, active normal faulting controls the emission of volcanic products. Such geometry has implication on seismic activity around the plumbing system during unrest. Static Coulomb stress changes induced by the 2011-2012 inflation within a preexisting NW-SE extensional regional stress field, compatible with fault geometry, increased by more than 0.5 MPa in an ellipsoid-shaped zone beneath the Minoan caldera where almost all earthquakes (96%) have occurred since beginning of unrest. Magmatic processes perturb the regional stress in the caldera where strike-slip rather than normal faulting along NE-SW striking planes are expected. The inflation may have also promoted more distant moderate earthquakes on neighboring faults as the M > 5 January 2012, south of Christiania. Santorini belongs to a set of en echelon NE-SW striking rifts (Milos, Nysiros) oblique to the Aegean arc that may have initiated in the Quaternary due to propagation of the North Anatolian fault into the Southern Aegean Sea.
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Submitted on : Monday, February 21, 2022 - 4:35:43 PM
Last modification on : Tuesday, February 22, 2022 - 3:36:01 AM
Long-term archiving on: : Sunday, May 22, 2022 - 7:08:01 PM

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Nathalie Feuillet. The 2011-2012 unrest at Santorini rift: Stress interaction between active faulting and volcanism. Geophysical Research Letters, American Geophysical Union, 2013, 40, pp.3532-3537. ⟨10.1002/grl.50516⟩. ⟨insu-03581781⟩

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