From an analysis of the seismicity of the Mediterranean basin we obtain a model of the deep structure of this region that is a further improvement to the plate tectonic theory. Taking into account the data of seismology, the gravity anomalies, volcanism and the few available data on the heat flow in this region, we conclude that the African plate is wedged under the Euro‐Asiatic plate with a slope of approximately 58° in the Lipari region and 35° in the Aegean region. This model can explain the high seismicity of middle south Italy, the sinking of middle north Italy, and the uplift of south Italy. The last movement is confirmed also by geologic and archeologic data. The archeologic data give an uplift rate of 0.034 cm/yr.
A method is described that makes possible the identification of the independent seismic units of a given area (Caputo and Postpischl, 1973 b).The seismic information is treated as a bidimensional signal disturbed by a certain background noise. The filtering of this noise makes it possible to delineate the seismic areas objectively.An indirect check on the method was made by estimating with respect to the various regions identified the a and /J parameters of the law Ny = a e~Py which gives the number of earthquakes with magnitude (intensity) greater than or equal to y.RIASSUNTO. -In questa nota viene descritto un metodo che rende possibile l'identificazione delle unità sismiche indipendenti di una data zona.L'informazione sismica è considerata come un segnale bidimensionale disturbato da un certo rumore di fondo. Filtrando detto rumore, si possono tracciare, da un punto di vista oggettivo, le aree sismiche.Il metodo usato è stato verificato indirettamente, mediante la stimarispetto alle varie regioni identificate -dei parametri a e /? della legge: Nv = a legge che rappresenta il numero di terremoti con magnitudo (intensità) maggiore o uguale a y.
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