Fig. 1

Seismicity map between 1998 and 2017. Earthquake locations are from the catalogs of Kandilli Observatory and Earthquake Research Institute and the National Observatory of Athens. Boxes outline regions where the clusters of seismicity are considered in the analysis and named with the closest geographical location (see also Supporting Information). The beach balls show the mechanisms of the earthquakes between 1998 and 2017 with the largest magnitude (in dark red color, Mw >  = 6.0) in each cluster (CMT Catalog). The red lines show the major active faults (Emre et al. 2018) and the green ones the Hellenic trench