The Hellenic Volcanic Arc

Major tectonic plates of the earth (Source: Wikimadia Commons,
Major tectonic plates of the earth (Source: Wikimadia Commons,
The Aegean and its main features (courtesy: WIkimedia Commons,
The Aegean and its main features (courtesy: WIkimedia Commons,
The Aegean and its surrounding areas (including the Balkan and Western Turkey) are the most seismically active areas of the whole Mediterranean and in the whole West Eurasia. The reason is that this area is among the most stressed part of the collision zone between the Eurasian and the African tectonic plates.
The most prominent morphological features in this area from south to north are: the Mediterranean ridge (or chain), the Hellenic trench, the Hellenic arc and the northern Aegean trough.
The island of Crete represents an uplifting sedimentary fore-arc zone located north of the subduction zone in the transition between the African and Eurasian plates.
The Hellenic arc parallels the subduction zone at a distance of about 120 km to the north, and contains several active volcanic centers (Methana, Santorini, Nisyros, the Bodrum Peninsula).
The Cretan Trough is a depression between Crete subject reaching a depth of about 2000 m.
The most interesting feature of the northern Aegean is the northern Aegean trough, which reaches depths to about 1500 m. Its extension to the NE includes probably the small depressions of the Marmara Sea.

Cited references:

Papazachos, B.C., Papadimitriou, E.E., Kiratzi, A.A., Papazachos, C.B., Louvari, E.K., (1998). "Fault plane solutions in the Aegean Sea and the surrounding area and their tectonic implications", Bollettino di Geofisica Teoretica ed Applicata, 39, pp. 199-218
TAYMAZ, T., YILMAZ, Y. & DILEK, Y. (eds) (2007) "The Geodynamics of the Aegean and Anatolia." Geological Society, London, Special Publications, 291, 1–16
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