Statistical analysis of earthquake activity at Etna volcano (March 1981 eruption) |
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| Authors: | Giuseppe De Natale Stefano Gresta Giuseppe Patané Aldo Zollo |
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| Institution: | (1) Osservatorio Vesuviano, Ercolano, Napoli, (Italy);(2) Istituto di Scienze della Terra, Universita di Catania, (Italy) |
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| Abstract: | Seismic activity that preceded, accompanied, and followed the 17–23 March 1981 Etnean eruption has been statistically analyzed.On the grounds of both time evolution of seismicity and catalogue completeness, three time intervals have been defined (12 February–2 March, 12–17 March, 19–31 March) and for each of these periods both the  b coefficient of theGutenberg-Richter's (1956) relationship and the E parameter of the cluster size (Shlien andToksoz, 1970) have been calculated.No significant variations were observed between the first and third periods, while lower values of bothb andE coefficients were found in the second one. These findings might indicate that changes in the seismicity features occur just before the eruption start.Small but fast variations in the stress field acting on the volcano might originate this type of seismic activity, while the importance of the tectonic control on volcanic phenomena seems to be confirmed. |
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| Keywords: | Volcanic earthquakes statistical analysis Mt Etna |
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