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The March 2021 Tyrnavos, central Greece, doublet (Μw6.3 and Mw6.0): Aftershock relocation, faulting details, coseismic slip and deformation

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The March 2021 Tyrnavos, central Greece, doublet (Μw6.3 and Mw6.0): Aftershock relocation, faulting details, coseismic slip and deformation (EN)
Galanis, Odysseus
Vamvakaris, Dominikos
Ventouzi, Chrysanthi
Bitharis, Stylianos
Foumelis, Michael
Pikridas, Christos
Fotiou, Aristeidis
Paradisopoulou, Parthena
Papazachos, Costas
Hatzidimitriou, Panagiotis
Papadimitriou, Eleftheria
Kourouklas, Christos
Kiratzi, Anastasia
Grendas, Ioannis
Karakaisis, George
Kementzetzidou, Despoina
Chatzipetros, Alexandros
Kostoglou, Anastasios
Karakostas, Vasileios
Panou, Areti
Karagianni, Eleni
Chatzis, Nikolaos
Kkallas, Charalambos
Scordilis, Emmanuel
Bonatis, Pavlos
Karagianni, Ioanna
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
2021-08-24
On 3 March 2021, the Mw6.3 Tyrnavos earthquake shook much of the Thessalia region, leading to extensive damage in many small towns and villages in the activated area. The first main shock was followed in the next day, on 4th of March 2021, by an “equivalent” main shock with Mw6.0 in the adjacent fault segment. These are the largest earthquakes to strike the northeastern part of Thessalia since the M6.3, 1941 Larissa earthquake. The main shocks triggered extensive liquefaction mainly along the banks of the Titarisios tributary where alluvial flood deposits most probably amplified the ground motions. Our seismic monitoring efforts, with the use of recordings of the regional seismological network along with a dense local network that was installed three days after the seismic excitation initiation, led to the improved understanding the geometry and kinematics of the activated faults. The aftershocks form a north–northwest–trending, east–northeast–dipping, ~40 km long distribution, encompassing the two main ruptures along with minor activated structures, consistent with the rupture length estimated from analysis of regional waveform data and InSAR modeling. The first rupture was expanded bilaterally, the second main shock nucleated at its northern tip, where from this second rupture propagated unilaterally to the north–northwest. The focal mechanisms of the two main shocks support an almost pure normal faulting, similar to the aftershocks fault plane solution determined in this study. The strong ground motion of the March 3 main shock was computed with a stochastic simulation of finite fault model. Coseismic displacements that were detected using a dense GPS / GNSS network of five permanent stations located the Thessaly region, have shown an NNE–SSW extension as expected from the nature and location of the causative fault. Coulomb stress changes due to the coseismic slip of the first main shock, revealed that the hypocentral region of the second main shock was brought closer to failure by more than 10 bars. (EN)
finite-fault slip model (EN)
seismic sequence (EN)
stress transfer and triggering (EN)
seismological geodesy (EN)
Δελτίο της Ελληνικής Γεωλογικής Εταιρίας
Αγγλική γλώσσα
Geological Society of Greece (EN)
0438-9557
2529-1718
Δελτίο της Ελληνικής Γεωλογικής Εταιρείας; Τόμ. 58 (2021): Special Issue on the 2021 Northern Thessaly, Greece, Earthquake Sequence; 131-178 (EL)
Bulletin of the Geological Society of Greece; Vol. 58 (2021): Special Issue on the 2021 Northern Thessaly, Greece, Earthquake Sequence; 131-178 (EN)
https://creativecommons.org/licenses/by-nc/4.0
Copyright (c) 2021 Vasileios Karakostas, Costas Papazachos, Eleftheria Papadimitriou, Michael Foumelis, Anastasia Kiratzi, Christos Pikridas, Anastasios Kostoglou, Charalambos Kkallas, Nikolaos Chatzis, Stylianos Bitharis, Alexandros Chatzipetros, Aristeidis Fotiou, Chrysanthi Ventouzi, Eleni Karagianni, Pavlos Bonatis, Christos Kourouklas, Parthena Paradisopoulou, Emmanuel Scordilis, Dominikos Vamvakaris, Ioannis Grendas, Despoina Kementzetzidou, Areti Panou, George Karakaisis, Ioanna Karagianni, Panagiotis Hatzidimitriou, Odysseus Galanis (EN)
Ελληνική Γεωλογική Εταιρεία
Δελτίο της Ελληνικής Γεωλογικής Εταιρίας
Natural Hazards



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