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A syn-eruptive ground deformation episode measured by GPS, during the 2001 eruption on the upper southern flank of Mt Etna

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Ground deformation occurring on the southern flank of Mt Etna volcano during the July–August 2001 eruption was monitored by GPS measurements along an E–W profile crossing the fissure system. This profile was measured eight times during the eruption, using the 'stop and go' semi-kinematic technique. Horizontal and vertical displacements between GPS surveys are reported for each station. The most significant event is a deformation episode occurring during the first week of the eruption, between 25–27 July. Displacements were measured on benchmarks close to the eruptive fissure and the tensile 1989 fracture. Data inversions for measured displacements were performed using the Okada model. The model shows the narrowing of the 2001 dyke accompanied by a dextral dislocation along an east-dipping fault, parallel to the 1989 fracture.

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The authors are grateful to Alessandro Galvani and Arianna Pesci for their valuable collaboration during the GPS surveys and during the preliminary data processing. Thanks are due also to researchers and technicians of the Istituto Nazionale di Geofisica e Vulcanologia that contributed to the field work. Alessandro Bonforte and Mimmo Palano were supported by PhD grants from the University of Catania.

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Correspondence to Alessandro Bonforte.

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Bonforte, A., Guglielmino, F., Palano, M. et al. A syn-eruptive ground deformation episode measured by GPS, during the 2001 eruption on the upper southern flank of Mt Etna. Bull Volcanol 66, 336–341 (2004).

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