The northern Thessaly strong earthquakes of March 3 and 4, 2021, and their neotectonic setting

A sequence of earthquakes occurred on March 3rd and 4th in Northern Thessaly, northern Greece, associated with previously unknown, blind normal faults within the crystalline Palaeozoic basement Pelagonian geotectonic zone. Surficial ground deformation, such as liquefaction phenomena fluvial plains, well soil fissures rock falls, have been mapped. Geological indications unmapped seismic fault, i.e., reactivated shear zones, open cracks, etc., identified bedrock. Based geological indications, main fault projection to surface could be considered a 15 km NW-SE trending structure average dip 45o NE. The source shock was modelled, Coulomb static stress changes calculated for receiver similar source. determination active tectonic regime region by geodetic data well-known NE Thessaly plain are also presented, revised historical instrumental seismicity. This earthquake raises new concerns challenges, revising some established views, status orientations, orientation structures, occurrence seismogenic mountainous massif rocks without typical geomorphological expression role Seismic Hazard Assessment.