GNGTS 2018 - 37° Convegno Nazionale

GNGTS 2018 S essione 1.2 193 The NNW-SSE trending transect also shows similar trends for the strength (maximum value, around Dibra, 315 MPa; minimum 110 MPa, towards the southern Peloponnesus), the BDT depth (going from around 25 km in the north to 10 km in the south) and the geothermal gradient along the ca. north-south direction (Fig. 3). In this case, the increase of the temperatures at depth and the related rheological weakening towards the southern sector of the transect may be tentatively linked to the close presence of the Hellenic volcanic arc in the southern Aegean. From a seismogenic point of view we therefore identified a thinning schizosphere from west to east in the Northern Aegean Region, as well as a decreasing thickness of the seismogenic layer from north to south along the transect parallel to the Hellenides belt. Fig. 2 - Thermo-rheological properties of the WSW-ENE trending transect: a) temperature depth distribution; b) maximum shear strength depth distribution; c) BDT depth variation along strike (yellow dashed line). The small triangles indicate the position of the 1D profiles, while the solid thin red line represents the sediments-upper crust boundary. The two dashed black lines indicate, respectively, the Conrad and the Moho depth. Dark blue corresponds to limestone, pale blue to metasediments; pink to quartzite and red to granodiorite.