Insight into Mt. Etna (Italy) kinematics during the 2002-2003 eruption as inferred from seismic stress and strain tensors

Details Insight into Mt. Etna (Italy) kinematics during the 2002-2003 eruption as inferred from seismic stress and strain tensors Insight into Mt. Etna (Italy) kinematics during the 2002-2003 eruption as inferred from seismic stress and strain tensors

Nov 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3121614b&link_type=abstract

Geophysical Research Letters, Volume 31, Issue 21, CiteID L21614

Physics

12

Seismology: Seismicity And Seismotectonics, Seismology: Volcano Seismology (8419), Volcanology: Eruption Mechanisms, Volcanology: Magma Migration

Scientific paper

Seismic activity linked to the 2002-03 Mt. Etna eruption was investigated by analyzing the Md > 2.3 earthquakes. The results of 3D relocation were used to compute fault plane solutions and a selected dataset was inverted to determine stress and strain tensors. The analysis revealed a complex kinematic response of the eastern flank dominated by fast stress propagation and reorientation. We hypothesize that a vertical dike intruded the southern flank, generating an extensional regime that triggered a radial intrusion in the northeast sector of the volcano. The combined effects gave rise to a rotation of the stress tensor that controlled the activation of the Pernicana fault system. The volcanic and tectonic interactions produced a second reorientation of the stress tensor, causing a structural response in the southeast lower flank. The overall result of the deformation processes observed during the eruption was an E-W extension on the eastern flank of the volcano.

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