@article {39137,
	title = {Seismotectonic analysis of the 2021 Damasi-Tyrnavos (Thessaly, Central Greece) earthquake sequence and implications on the stress field rotations},
	volume = {150},
	year = {2022},
	month = {2022},
	pages = {101898},
	abstract = {In early March 2021, three shallow earthquakes, two mainshocks with M6.3 and M6.0 and one major aftershock with M5.6 impacted both the mountainous Damasi-Tyrnavos region (northern Thessaly, Greece) and the adjacent Plio-Quaternary basin. Each major event was followed by rich aftershock activity recorded by local and regional seismographs and accelerographs. Herein, we present a comprehensive analysis of the seismic sequence, from its foreshock activity starting on 28 February, 2021 and for a period of two months using new high-resolution catalogues of relocated earthquakes and hundreds of focal mechanisms. The results indicate that the aftershocks form a zone that spans ~50~km NW-SE, while focal depths range between 5 and 15~km. More than 400 focal mechanisms, computed for events with M>=~2.5, mainly exhibit normal faulting in a NW-SE direction, while WNW-ESE to E-W normal faulting is also evidenced, in particular after the occurrence of the last major event on 12 March. The stress-field was reconstructed on a local and broader scale by inverting focal mechanism data, revealing a rotation of the σ3 axis trend from NNE-SSW, in the Damasi-broader region, to NW-SE northwards, to the region of Kozani-Grevena that hosted an Mw =~6.6 shallow mainshock in 1995. Subcrustal seismicity, present beneath those areas, implies that large-scale tectonics and plate dynamics are likely involved in the deformation of the upper crust. Coulomb stress transfer after the 3 major events of the 2021 Damasi-Tyrnavos sequence reveals that stress-loaded areas include those where most aftershocks were triggered. The analysis provides implications to the seismic hazard of the activated area, as a major NW-SE active normal fault close to Larissa city became stress-loaded, constituting a possible candidate source for significant future earthquakes.},
	keywords = {Coulomb stress, Focal mechanisms, Relocation, Seismotectonics, Stress inversion},
	isbn = {0264-3707},
	url = {https://www.sciencedirect.com/science/article/pii/S0264370722000023},
	author = {Ioannis Kassaras and Vasilis Kapetanidis and Athanassios Ganas and Andreas Karakonstantis and Panayotis Papadimitriou and George Kaviris and Kouskouna, Vasiliki and Voulgaris, Nicholas}
}
