A model for eruptive mechanisms of Mt. Etna from the study of seismicity from 1978 to 1983 |
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| Authors: | M Cosentino G Lombardo |
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| Institution: | (1) Ist. Scienze della Terra, University of Catania, C.so Italia 55, Catania, Italy |
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| Abstract: | The papers deals with the seismic activity occurred on Mt. Etna from 1978 to 1983, and special emphasis is given to the seismicity linked to eruptive phenomena that took place during that period.Location of epicentres and hypocentres of all earthquakes occurred during the considered years and in association with each eruption has shown to be a useful tool to investigate relationships between seismicity and characteristics of various eruptions.A preliminary model is proposed to explain seismo-eruptive mechanisms controlling the uprise of magma and subsequent eruptions of Mt. Etna. The complexity of phenomena observed in the Etnean area could be interpreted as the result of the combined effect of regional stress field and local changes of it due to the volcano structural inhomogeneities. Thus, the earthquakes occurring in the studied area may cause either partial intrusion of magma at various depth, or final opening of surface fractures and subsequent output of lava. |
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