Strong (M 7.0) Earthquake-Prone Areas in Hellenides, Greeceстатья
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Дата последнего поиска статьи во внешних источниках: 17 ноября 2021 г.
Аннотация:Geological and geomorphological criteria for the areas prone to the earthquakes with magnitudesM ≥ 7.0 are determined for the territory of the Hellenides located in the southern part of the Balkan Peninsula.Intersections of morphostructural lineaments identified by the morphostructural zoning method are consideredas seismogenic structures. Geological and geomorphological parameters were determined in a unifiedmanner for all lineament intersections. It is established that earthquake epicenters with М ≥ 7.0 are confinedto the intersections of lineaments. The intersections associated with the observed earthquakes with М ≥ 7.0are used for training the recognition algorithm Cora-3. Based on the geological and geomorphic parameters,the recognition algorithm revealed the characteristic traits according to which all the lineament intersectionswere classified into the highly seismic (H) (historically called as dangerous, D) and low seismic (L) (historicallycalled non-dangerous (N)) relative to the threshold magnitude М0 = 7.0. As a result, all these intersectionswere recognized as dangerous, just as another 24 intersections at which the events with magnitudeM ≥ 7.0 have not been previously observed. In particular, these intersections are recognized on the Evia Islandwhere the western branch of the North Anatolian fault approaches the coast of Central Greece. Anothergroup of D-intersections is located in the central part of the Gulf of Corinth, the tectonically most active areaof the region where, however, the earthquakes with M ≥ 7.0 have not been detected so far. The characteristictraits of D- and N-intersections (seismicity criteria) are formed by the morphometric parameters. The intervalsof values of these parameters that are characteristic of D-intersections hint to the processes of subsidenceand extension predominant in the areas of these intersections.