Space-time distribution of small earthquakes at Phlegraean Fields,south-central Italy |
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| Authors: | E Del Pezzo G De Natale A Zollo |
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| Institution: | (1) Osservatorio Vesuviano, 80056 Ercolano (Naples), Italy |
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| Abstract: | A preliminary statistical analysis of the space-time distribution of small seismic events in the volcanic area of Phlegraean Fields, south-central Italy, was done on the basis of a catalogue of earthquakes recorded by the local seismic stations in the period January 1, December 31, 1983.The non-random character of the sequence has been tested by matching the observed time-dstribution of seismic events with the theoretical Poisson process.A clustered occurrence of seismic events seems to be the main cause of the departure from a Poisson process as the inter-arrival times distribution clearly shows.Furthermore, the non-random behaviour of the events space-time distribution mainly due to quiescient and clustered recursive seismic phases could be studied by using the method proposed byVon Seggern
et al. (1981). The analysis and the space-time diagrams confirm the swarm-type character of the entire seismic sequence. |
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