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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.