(a) Generalized tectonic map of the Vegoritis-Ptolemais fault system, (b, c) Stereographic projections (equal area, lower hemisphere) indicating (b) the latest movement of the large faults of the fault system and the contemporary stress axes (rhomb: sigma-1; triangle: sigma-2; square: sigma-3) and (c) the focal mechanisms that occurred within or near the basin. white rhomb: shortening (P) axis; white square: extension (T) axis. Both projections indicate the same extensional stress field with the least principal stress axis oriented NW-SE.
[from Mountrakis et al. (2006)].
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