Neotectonic study of Northwestern Greece

Ntokos, Dimitrios

doi:10.1080/17445647.2018.1445562

Cited by 15 publications

(18 citation statements)

References 24 publications

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“…The main shock was preceded by a strong foreshock on the previous day (see the catalogue of the Aristotle University of Thessaloniki at http://geophysics.geo.auth.gr/ss/CATALOGS/seiscat.dat). Geosciences 2020, 10, x FOR PEER REVIEW 7 of 26 [16,17]) and the epicentral area of the 1895 event (red ellipse). The instrumental seismicity data for Mw > 5.2 [26] is shown as solid circles.…”

Section: Historical Seismicity and The 1895 Eventmentioning

confidence: 99%

The Mw = 5.6 Kanallaki Earthquake of 21 March 2020 in West Epirus, Greece: Reverse Fault Model from InSAR Data and Seismotectonic Implications for Apulia-Eurasia Collision

Valkaniotis¹,

Briole

Ganas

et al. 2020

Geosciences

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We identify the source of the Mw = 5.6 earthquake that hit west-central Epirus on 21 March 2020 00:49:52 UTC. We use Sentinel-1 synthetic aperture radar interferograms tied to one permanent Global Navigation Satellite System (GNSS) station (GARD). We model the source by inverting the INSAR displacement data. The inversion model suggests a shallow source on a low-angle fault (39°) dipping towards east with a centroid depth of 8.5 km. The seismic moment deduced from our model agrees with those of the published seismic moment tensors. This geometry is compatible with reverse-slip motion along the west-verging Margariti thrust fault that accommodates part of the convergence within the collision zone between Apulia and Eurasia. We also processed new GNSS data and estimate a total convergence rate between Apulia and Eurasia of 8.9 mm yr−1, of which the shortening of the crust between the Epirus coastal GNSS stations and station PAXO in the Ionian Sea (across the Ionian Thrust) is equivalent to ~50% of it or 4.6 mm yr−1. By back-slip modelling we found that a 60-km wide deformation zone takes up nearly most of the convergence between Apulia-Eurasia, trending N318°E. Its central axis runs along the southwest coast of Corfu, along the northeast coast of Paxoi, heading toward the northern extremity of the Lefkada island. The island of Paxoi appears kinematically as part of the Apulian plate.

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Section: Historical Seismicity and The 1895 Eventmentioning

confidence: 99%

The Mw = 5.6 Kanallaki Earthquake of 21 March 2020 in West Epirus, Greece: Reverse Fault Model from InSAR Data and Seismotectonic Implications for Apulia-Eurasia Collision

Valkaniotis¹,

Briole

Ganas

et al. 2020

Geosciences

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“…Panel (C) shows the relocated epicentre of the mainshock (this study; white star) and its aftershocks (red circles; period 2020/03/20-2020/05/23). Fault traces modified after [16,17]. Black line between Paxos and Corfu islands indicates the trace of the Ionian thrust (ticks on the overriding side).…”

Section: Introductionmentioning

confidence: 99%

The MW = 5.6 Kanallaki Earthquake of March 21, 2020 in West Epirus, Greece: Reverse Fault Model From Insar Data and Seismotectonic Implications for Apulia-Eurasia Collision

Valkaniotis¹,

Briole²,

Ganas³

et al. 2020

Preprint

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We identify the source of the Mw = 5.6 earthquake that hit west-central Epirus on March 21, 2020 00:49:52 UTC. We use synthetic aperture radar interferograms tied to one permanent Global Navigation Satellite System (GNSS) station (GARD). We model the source by inverting the INSAR displacement data. The inversion model suggests a shallow source on a low-angle fault (39°) dipping towards east with a centroid depth of 8.5 km. The seismic moment deduced from our model agrees with those of the published seismic moment tensors. This geometry is compatible with the Margariti thrust fault within the collision zone between Apulia and Eurasia. We also processed new GNSS data and estimate a total convergence rate between Apulia and Eurasia of 8.9 mm yr-1 , of which shortening of the crust between the Epirus coastal GNSS stations and station PAXO in the Ionian Sea is equivalent to ~ 50% of it or 4.6 mm yr−1. A 60-km wide deformation zone takes up nearly most of the convergence between Apulia-Eurasia, trending N318°E. Its central axis runs along the southwest coast of Corfu, along the northeast coast of Paxos, heading toward the northern extremity of the Lefkada island.

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“…During the Late Miocene, the thickened crust began to collapse by normal NE-trending faulting (c.f. Poulimemos & Doutsos, 1997;Ntokos, 2018)…”

Section: Discussionmentioning

confidence: 99%

Thermotectonic constraints on the geodynamic evolution of the Pindos fold‐and‐thrust‐belt by low‐temperature (U–Th)/He thermochronometry

et al. 2021

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NTUA)" has been corrected to "National Technical University of Athens (NTUA)" in the Acknowledgements section and has been added to the Funding Information section.] This study presents new thermochronometric data to constrain the cooling history of the Pindos fold-and-thrust-belt (PFTB) on the NW Peloponnese, and the timing of nappe stacking in the external Hellenides in western Greece. Low-temperature thermochronology was performed on apatite and zircon minerals extracted from basal exposures of the PFBT in Mt. Erymanthos (NW Peloponnese) using the (U-Th)/ He system. Three bedrock samples collected from a profile across the strike of the PFBT returned thermochronometric ages for the apatite (AHe) between 15 and 9 Ma, while for the zircon (ZHe) the ages are interpreted as unreset (or partially reset). The AHe ages are interpreted as cooling ages related to the Cenozoic geodynamic evolution of the PFTB. Thermal models generated in this research demonstrate two phases of geodynamic evolution of the PFBT during the Cenozoic: an early one associated with the heating of the fold-and-thrust belt during 40-20 Ma and a later one associated with fast cooling from 20 Ma onwards. Heating is attributed to the structural thickening of the PFTB while cooling is associated with enhanced uplift and exhumation, which became widespread in Erymanthos by 9 Ma. The initiation of cooling on Mt. Erymanthos echoes the substantial geometric remodelling that underwent the Hellenic arc during the Middle Miocene, associated with slab rollback and arc extension, and is connected to the underplating of the internal segments of the external platform (Gavrovo-Tripolis unit) by the external metamorphic segments (Mani and Arna units). The current inverse thermal modelling offers the first continuous description of the geodynamic evolution of the most prominent fold-and-thrust belt of the Hellenides, from the oceanic stage through basin inversion to uplift and orogen decay.

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Neotectonic study of Northwestern Greece

Cited by 15 publications

References 24 publications

The Mw = 5.6 Kanallaki Earthquake of 21 March 2020 in West Epirus, Greece: Reverse Fault Model from InSAR Data and Seismotectonic Implications for Apulia-Eurasia Collision

The Mw = 5.6 Kanallaki Earthquake of 21 March 2020 in West Epirus, Greece: Reverse Fault Model from InSAR Data and Seismotectonic Implications for Apulia-Eurasia Collision

The MW = 5.6 Kanallaki Earthquake of March 21, 2020 in West Epirus, Greece: Reverse Fault Model From Insar Data and Seismotectonic Implications for Apulia-Eurasia Collision

Thermotectonic constraints on the geodynamic evolution of the Pindos fold‐and‐thrust‐belt by low‐temperature (U–Th)/He thermochronometry

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