The 2 December 2020 MW 4.6, Kallithea (Viotia), central Greece earthquake: a very shallow damaging rupture detected by InSAR and its role in strain accommodation by neotectonic normal faults

• Autorzy: Valkaniotis Sotiris , De Novellis Vincenzo , Ganas Athanassios , Sansosti Eugenio , Convertito Vincenzo , Briole Pierre , Tsironi Varvara , Karasante Ilektra , Karamitros Ioannis

Identyfikatory

DOI

10.1007/s11600-023-01213-2

• Języki publikacji: EN

Abstrakty

EN

On 2 December 2020 10:54 UTC a shallow earthquake of MW (NOA) = 4.6 occurred near the village of Kallithea (to the east of Thiva), central Greece, which, despite its modest size, was locally damaging. Using InSAR and GNSS data, we mapped a permanent change on the ground surface, i.e., a subsidence of 7 cm. Our geodetic inversion modelling indicates that the rupture occurred on a WNW-ESE striking, SSW-dipping normal fault, with a dip-angle of ~ 54°. The maximum slip value was 0.35 m, which was reached at a depth of about 1100 m. The analysis of broadband seismological data also provided kinematic source parameters such as moment magnitude MW = 4.6 (± 0.1), rupture area 6.3 km2 and mean slip 0.16 m, which agree with the values obtained from the geodetic model. The effects of the earthquake were disproportionate to its moderate magnitude, probably due to its unusually shallow depth (slip centroid at 1.1 km) and the high efficiency of the earthquake (radiation efficiency q = 0.62). The geodetic data inversion also indicates that within the uncertainty limits of the technique, three scenarios are possible (a) the earthquake responsible for the mapped surface deformation may have occurred on a ~ 2-km long, blind normal fault different from the well-known active Kallithea normal fault or (b) could have occurred along a secondary fault that branches off the Kallithea fault or (c) it may have occurred along the Kallithea fault itself, but with its geometrical configuration could not be modelled with available data. We have also concluded that with a high dip-angle Kallithea Fault forward model it is not possible to fit the geodetic data. The rupture initiated at a very shallow depth (1.1 km) and it could not propagate deeper possibly because of a structural barrier down-dip. The 2020 event near Kallithea highlighted the structural complexity in this region of the Asopos Rift valley as the reactivation of the WNW-ESE structures indicates their significant role in strain accommodation and that they still represent a seismic hazard for this region.

Słowa kluczowe

EN

earthquake; InSAR; inversion; radiation efficiency; Viotia; Greece

PL

trzęsienie ziemi; InSAR; inwersja; efektywność radiacyjna; Viotia; Grecja

• Wydawca: Instytut Geofizyki PAN ; Springer
• Czasopismo: Acta Geophysica
• Rocznik: 2024
• Tom: Vol. 72, no. 3
• Strony: 1523--1541
• Opis fizyczny: Bibliogr. 90 poz.

Twórcy

autor

Valkaniotis Sotiris

• Department of Civil Engineering, Democritus University of Thrace, 67100 Xanthi, Greece

• https://orcid.org//0000-0003-0003-2902

autor

De Novellis Vincenzo

• National Research Council (CNR), Istituto per il Rilevamento Elettromagnetico dell’Ambiente (IREA), Via Diocleziano 328, Naples, Italy

autor

Ganas Athanassios

• National Observatory of Athens, Institute of Geodynamics, Lofos Nymfon, Thission, 11810 Athens, Greece

• https://orcid.org/0000-0002-1937-3283

autor

Sansosti Eugenio

• National Research Council (CNR), Istituto per il Rilevamento Elettromagnetico dell’Ambiente (IREA), Via Diocleziano 328, Naples, Italy

• https://orcid.org/0000-0002-5051-4056

autor

Convertito Vincenzo

• Istituto Nazionale di Geofisica e Vulcanologia (INGV), Osservatorio Vesuviano (OV), Via Diocleziano 328, Naples, Italy

• https://orcid.org/0000-0002-7115-7502

autor

Briole Pierre

• Laboratoire de Géologie - UMR CNRS 8538, Ecole Normale Supérieure de Paris, PSL Research University, 24 Rue Lhomond, 75005 Paris, France

autor

Tsironi Varvara

• Department of Civil Engineering, Democritus University of Thrace, 67100 Xanthi, Greece
• National Observatory of Athens, Institute of Geodynamics, Lofos Nymfon, Thission, 11810 Athens, Greece

• https://orcid.org/0000-0002-5701-3262

autor

Karasante Ilektra

• National Observatory of Athens, Institute for Astronomy, Astrophysics, Space Applications and Remote Sensing (IAASARS), Vas. Pavlou and I. Metaxa, Penteli, 15 236 Athens, Greece

autor

Karamitros Ioannis

• National Observatory of Athens, Institute of Geodynamics, Lofos Nymfon, Thission, 11810 Athens, Greece

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