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Geological Society, London, Special Publications; 2006; v. 269; p. 181-193;
DOI: 10.1144/GSL.SP.2006.269.01.12
© 2006 Geological Society of London

On the mechanics of caldera resurgence of Ischia Island (southern Italy)

S. Carlino1, E. Cubellis1, G. Luongo2 & F. Obrizzo1

1 Istituto Nazionale di Geofisica e Vulcanologia — Sezione Osservatorio Vesuviano, Via Diocleziano 328, 80124 Naples, Italy cubellis{at}ov.ingv.it
2 Università Federico II di Napoli, Dipartimento di Scienze della Terra, Largo S. Marcellino 10, 80138 Naples, Italy

A model of caldera resurgence was applied to the Island of Ischia to explain uplift, volcanic activity and tectonics on Mount Epomeo, as well as historical seismicity and slow ground movements recorded for the past 2000 years. A two-dimensional mechanical model was utilized for the crust, which was considered to be an elastic plate overlying a laccolith. Geometric dimensions and mechanical parameters were constrained using geological, geophysical and geochemical data.

We propose that a laccolith, with a diameter L of c. 10 km, and a depth of up to 1 km in the centre of the island, triggered the caldera resurgence after the Mount Epomeo Green Tuff eruption forming the caldera (55 000 a BP). A bending phase and a punched laccolith phase are thought to have caused the observed deformations in the caldera. These processes control the tectonics at the boundary of the Mount Epomeo resurgent structure, volcanic activity and dynamics of the island.