A statistical analysis is applied to the sequence of earthquakes, with epicentral intensity I0 ≥ VIII MSK, which occurred in the Calabro‐Peloritan Arc region (southern Italy) during the period 1600–1974. The study reveals, by the application of the Poisson test, an evident level of interdependence of the shocks which appear grouped in temporal clusters satisfying the simple Poisson process. In fact, the equations which characterize the generalized Poisson process give a good fit of the observed data, the distribution of the events in the clusters being of the Pareto type (discrete). The values 0.9 and 2.8 have been found for k′ and E parameters, which are the average number of clusters occurring in unit time and the parameter of the Pareto distribution, respectively. A subsequent elaboration of these results makes the calculation of some quantities, like the clustering length, possible. Finally, a statistical interpretation of the sequence, with the characterization of the clusters, is proposed.
The analysis of a large number of macroseismic fields of past and recent earthquakes in Southern Italy allows a wider check of a previous interpretative model of the anisotropy of the regional macroseismic field, in the context of a more recent point of view of the tectonics.
The definition of some of the standards used for evaluating local effects and optimizing the relative macroseismic procedures are critically considered, also from the different interpretative points of view to have come out of the « Earthquake Catalogue » work group of the Italian Geodynamics Projetc (PFG). Particular stress has been laid on the significance and reliability of the main macroseismic parameters which depend most directly on the investigative criteria used and on their ability to characterize efficiently the interaction of earthquakes and environment.Essentially, the analysis is of critical considerations and field-observations, the fruit of macroseismic investigations carried out prevalently in the Calabro-Peloritan Arc region. The seismic intensity, the use of macroseismic scales, the investigatory criteria, the macroseismic field and its Research financed by the CNR (National Research Council) under the Italian Geodynamics Project, contract no. 79.00777.89.
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