Map views at (a) 80 km, (b) 175 km, (c) 350 km and (d) 500 km depth. Major fault traces and suture zones are delineated in grey solid lines and grey dashed lines respectively. Yellow and magenta filled circles mark two different episodes of magmatism distribution (Fig. 1). White lines delineate −4 and 2% contours of δlnVS.