Seismic activity accompanying the outbreak of the 1991–1993 eruption of Mt. Etna (Italy) |
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| Authors: | Fabrizio Ferrucci Domenico Patan |
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| Institution: | Fabrizio Ferrucci,Domenico Patanè |
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| Abstract: | The character and location of seismic activity accompanying the onset of the 1991–1993 eruption at Mt. Etna are compatible with the surface evidence of the volcanic pile rupture. Both the epicentral distribution and the focal mechanisms of a swarm that occurred on December 14, 1991, agree with magma ascent occurring along the main NNW-SSE-trending structure of the volcano and the consequent opening of a system of effusive fissures with the same trend. A typical mainshock-aftershock sequence, recorded the day after and indicating transcurrent displacement occurring along the second-principal structure of Etna (NE-SW), depicts the tectonic response of the volcanic pile and the underlying basement to major stresses applied by the magma push. |
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