| Abstract: | The parameter b of the frequency-magnitude relation has been accurately calculated for each of the 21 seismic zones into which the Aegean and surrounding area (34°N–43°N, 18°E–30°E) has been divided on the basis of several seismotectonic criteria. These 21 seismic zones have been geographically separated into three (A, B, C) groups (regions), according to the values of the parameter b. The outer region (A) is characterized by a relatively high value (= 1.03) the middle region (B) by an intermediate value (= 0.84) and the innermost region (C) by a low value (= 0.60). The boundaries of these three groups of zones almost coincide with the boundaries of well-known geological zones. This observation is interpreted in terms of mechanical heterogeneity of the material, and of structural and stress conditions in the area. |
