Abstract
The Etnean eruption of March–August 1983 can be considered among the most important in the last years. The associated seismic activity was carefully studied in order to detect possible changes of theb coefficient in the equation relating frequency to magnitude of the seismic events. The analysis of 1056 B-type earthquakes, which occurred during the three months before the eruption, was carried out according to the maximum-likelihood method. A significant increase of theb value was noticed, followed by an almost linear decrease (from a mean value of 1.7 to 0.8) starting three weeks before the eruption. The observed pattern ofb values has been compared with that related to the Etnean eruption of March 1981, and some considerations on the volcano dynamics have been made.
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Gresta, S., Patanè, G. Changes inb values before the Etnean eruption of March–August 1983. PAGEOPH 121, 903–912 (1983). https://doi.org/10.1007/BF02590188
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DOI: https://doi.org/10.1007/BF02590188