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

Papaioannou, Ioannis

Kremastas, Evangelos

Sboras, Sotiris

Chatziioannou, Athanasios

Pavlides, Spyros

Bitharis, Stylianos

Foumelis, Michael

Galanakis, Dimitris

Pikridas, Christos

Chatzipetros, Alexandros

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

info:eu-repo/semantics/article

info:eu-repo/semantics/publishedVersion

Thessaly (EN)

earthquake geology (EN)

active faults (EN)

interferometry (EN)

modelling (EN)

Ελληνική Γεωλογική Εταιρεία

Δελτίο της Ελληνικής Γεωλογικής Εταιρίας

Natural Hazards

Δελτίο της Ελληνικής Γεωλογικής Εταιρίας

Αγγλική γλώσσα

2021-10-26

https://ejournals.epublishing.ekt.gr/index.php/geosociety/article/view/27225

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; 222-255 (EL)

Bulletin of the Geological Society of Greece; Vol. 58 (2021): Special Issue on the 2021 Northern Thessaly, Greece, Earthquake Sequence; 222-255 (EN)

https://creativecommons.org/licenses/by-nc/4.0 (EN)

Copyright (c) 2021 Alexandros Chatzipetros, Spyros Pavlides, Michael Foumelis, Sotiris Sboras, Dimitris Galanakis, Christos Pikridas, Stylianos Bitharis, Evangelos Kremastas, Athanasios Chatziioannou, Ioannis Papaioannou (EN)