Late Quaternary deformation in the western extension of the North Anatolian Fault (North Evia, Greece): Insights from very high-resolution seismic data (WATER surveys)

Caroir, Fabien; Chanier, Frank; Gaullier, Virginie; Sakellariou, Dimitris; Bailleul, Julien; Maillard, Agnès; Paquet, Fabien; Watremez, Louise; Averbuch, Olivier; Graveleau, Fabien; Ferrière, Jacky

doi:10.1016/j.tecto.2023.230138

Tectonophysics

2024

DOI: 10.1016/j.tecto.2023.230138

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Late Quaternary deformation in the western extension of the North Anatolian Fault (North Evia, Greece): Insights from very high-resolution seismic data (WATER surveys)

Fabien Caroir,

Frank Chanier,

Virginie Gaullier

et al.

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Cited by 3 publications

References 129 publications

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The 2022–2023 seismic sequence onshore South Evia, central Greece: evidence for activation of a left-lateral strike-slip fault and regional triggering of seismicity

Serpetsidaki,

Ganas

2024

J Seismol

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On 29 November 2022, an earthquake of ML 5.0 (Mw 4.8) occurred onshore South Evia Island (central Greece) preceded by a ML 4.7 (Mw 4.6) event. The pattern of relocated aftershocks indicates the activation of a single, near-vertical fault segment, oriented NW-SE at shallow crustal depths (6–11 km). We suggest that both events ruptured a blind, left-lateral strike-slip fault, about 5 km southeast of village Almyropotamos. We observed that a clear foreshock activity (N=55 events) existed before the two moderate events. The impact of the static stress loading on neighboring fault planes diminishes after a distance of 7 km from the November 2022 epicenters, where the static stress falls below +0.1 bar. We further explore triggering relationships between the 29 November events and the late December 2022 moderate events (ML 4.9) that occurred about 60 km toward NW in the Psachna and Vlahia regions of central Evia. We present evidence of possible delayed dynamic triggering of the late December 2022 central Evia sequence, based on marked changes in seismicity rates and on measured peak ground velocities (PGVs) and peak dynamic strains, both exhibiting local maxima in their map distributions. The causes of the delayed triggering may be related to the well-known geothermal field in central/north Evia and the NW-SE strike of the seismic fault.

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The 2022–2023 seismic sequence onshore South Evia, central Greece: evidence for activation of a left-lateral strike-slip fault and regional triggering of seismicity

Serpetsidaki,

Ganas

2024

J Seismol

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REWARE: a seismic processing algorithm to retrieve geological information from the water column

Sylvain,

Watremez,

Thinon

et al. 2024

Geophysical Journal International

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SUMMARY When interpreting marine very high-resolution (VHR) single-channel seismic reflection data, the signal in the water column is generally considered as noise and is often eliminated by a water-mute application to focus on geological information under the seafloor. Alternatively, the signal in the water column can be used to study ocean currents or gas/fluid emissions. To provide images of the sedimentary formations and tectonic structures beneath the seafloor in shallow water regions, such as continental shelves and lakes, marine seismic reflection profiles are often acquired using a single-channel streamer and sparker-type source, providing VHR data, with limited penetration depth. To exploit the full potential of these single-channel data, we propose a simple algorithm, called REWARE (Recovery of Water-column Acoustic Reflectors). This algorithm allows to extract further geological information from the water-column data using open-source codes (Seismic Un*x), adding the coherent signal from the previous shots, recorded in the water column, to the previous traces. The record length becomes longer while maintaining a very high trace-to-trace consistency. To demonstrate its efficiency, we present two examples of the REWARE processing in two different geological contexts: the East Sardinia shelf (Italy) and the North Evia Gulf (Greece). This method provides deeper images than with original data for seismic data acquired across steep slopes, such as canyons or continental shelf breaks. Thus, depending on the seafloor geometry and subseafloor structures, it is possible to image or map sediment layers and tectonic structures at depth, keeping a very high structural resolution.

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The Main Pelagonian Detachment (MPD): extensional reactivation of the frontal thrust of the Internal Zones of the Hellenides (Greece)

Chanier,

Ferrière,

Averbuch

et al. 2024

Comptes Rendus. Géoscience

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During the orogenic development of the Hellenides, the "Frontal Thrust of Internal Zones" (FTIZ) localised tectonic superposition of the Internal Zones over the External Zones. The belt was subsequently subject to a major extensional deformation responsible for a negative tectonic inversion of the FTIZ, along a major detachment called here "Main Pelagonian Detachment" (MPD). The along-strike changes in the geometry and the kinematics of the MPD suggest different tectonic configurations largely inherited from the flat-ramp-flat initial geometry of the thrust. The distribution of the recent basins, mainly located within the Internal Zones, illustrates the major role of the FTIZ reactivation in the overall collapse of Internal Hellenides.

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Late Quaternary deformation in the western extension of the North Anatolian Fault (North Evia, Greece): Insights from very high-resolution seismic data (WATER surveys)

Cited by 3 publications

References 129 publications

The 2022–2023 seismic sequence onshore South Evia, central Greece: evidence for activation of a left-lateral strike-slip fault and regional triggering of seismicity

The 2022–2023 seismic sequence onshore South Evia, central Greece: evidence for activation of a left-lateral strike-slip fault and regional triggering of seismicity

REWARE: a seismic processing algorithm to retrieve geological information from the water column

The Main Pelagonian Detachment (MPD): extensional reactivation of the frontal thrust of the Internal Zones of the Hellenides (Greece)

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