Transition from collision to subduction in Western Greece: the Katouna–Stamna active fault system and regional kinematics

Pérouse, Eugénie; Sébrier, Michel; Braucher, Régis; Chamot‐Rooke, Nicolas; Bourlès, Didier; Briole, Pierre; Sorel, D.; Dimitrov, Dimitar; Arsenikos, S.

doi:10.1007/s00531-016-1345-9

Cited by 38 publications

(53 citation statements)

References 48 publications

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“…[36] referred to a right lateral strike-slip system that resulted from the collision of western Greece with the Apulian platform, and runs through the western Greece to the KTFZ. The position of the identified activated fault segments, their strike and sense of slip agrees with the active fault mapping and suggested regional tectonics of [38]. A clockwise rotation 2 B discussed of the Ionian Islands and Akarnania block accommodated by major marginal strike-slip zones that appeared segmented along their strike is suggested by [39].…”

Section: Discussionsupporting

confidence: 77%

Τhe February – March 2019 Seismic Swarm Offshore North Lefkada Island, Greece: Microseismicity Analysis and Geodynamic Implications

Kostoglou¹,

Karakostas²,

Bountzis³

et al. 2020

Preprint

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A quite energetic seismic excitation consisting of one main and additional three distinctive earthquake clusters that occurred in the transition area between the Kefalonia Transform Fault Zone (KTFZ) and the continental collision between Adriatic and Aegean microplates, is thoroughly studied after high–precision aftershocks’ relocation. The activated fault segments are in an area where historical and instrumental data have never claimed the occurrence of a catastrophic (M>6.0) earthquake. The relocated seismicity initially defines an activated structure extending from the northern segment of the Lefkada branch of KTFZ with the same NNE–SSW orientation and dextral strike-slip faulting and then keeping the same sense of motion its strike becomes NE–SW and its dip direction NW. This provides unprecedented information on the link between the KTFZ and the Collision front and sheds more light on the regional geodynamics. The earthquake catalog, which is specially compiled for this study, starts one year before the occurrence of the Mw5.4 mainshock and adequately provides the proper data source for investigating the temporal variation of the b–value, which might be used for discriminating foreshock and aftershock behavior.

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Section: Discussionsupporting

confidence: 77%

Τhe February – March 2019 Seismic Swarm Offshore North Lefkada Island, Greece: Microseismicity Analysis and Geodynamic Implications

Kostoglou¹,

Karakostas²,

Bountzis³

et al. 2020

Preprint

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“…1 in Kiratzi et al, 2008). This result is consistent with paleoseismological evidence of important tectonic activity in the area of the Katouna earthquake (Pérouse et al, 2017). and November 1966 in the wider Kremasta region to a single seismic sequence.…”

Section: Tectonic Background: a Low Seismicity Region?supporting

confidence: 87%

Interpretations of Reservoir‐Induced Seismicity May Not Always Be Valid: The Case of Seismicity during the Impoundment of the Kremasta Dam (Greece, 1965–1966)

Stiros

Pytharouli

2018

Bulletin of the Seismological Society of America

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The 'Kremasta seismic sequence' in western Greece is one of the most commonly cited examples of Reservoir Induced Seismicity (RIS). Here, we show that this 'sequence' is a result of normal tectonic activity and that only some small, unrelated microseismic events are reservoir induced. Shortly after the beginning of the impoundment of the Kremasta Dam in 1965, the then newly established seismic monitoring network in Greece recorded two Ms ≥ 6.0 events and numerous small shocks spread over a 120 km wide region. These were interpreted as a single seismic sequence (namely the Kremasta seismic sequence), and assumed to be reservoir induced. We revisit the epicenter locations of these events and interpret them in the framework of the regional tectonic context and the local hydrogeology. Placing these events into the local context shows that they represent an amalgamation of separate, ordinary (tectonic) seismic sequences. Further, the regional rocks are highly fragmented by small faults and the spatial distribution of seismic events is not consistent with a model of stress transfer from reservoir loading. In addition, it is not likely that events at such long (> 20-30 km) distances from the reservoir could be induced by an initial reservoir load head of 30 m. Whilst the larger magnitude events are 2 tectonic, after impoundment local residents reported an unusual frequency of small microseismic events felt only within 10 km of the dam. We provide evidence that these are a result of the collapse of numerous shallow karstic cavities adjacent and beneath the reservoir due to increased water load (locally 100-150 m depth). This study has significant implications for interpretation of seismic triggering mechanisms in other regions: earthquake occurrence within the proximity of reservoirs during and after impoundment time cannot be assumed to be RIS unless supported by seismological, geological and hydrogeological evidence.

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“…The southern Apulian foreland is bounded eastward by the thrust front of the Hellenides (Figure a; that runs offshore the Ionian Islands of Corfu‐Lefkada‐Zante) and is active since the late Miocene [ Tranos and Lacombe , ]. The passage from collision to subduction takes place in Western Greece and is accommodated along the downgoing plate by the Kefalonia right‐lateral fault that transfers the Apulian collision front to the Hellenic subduction front [ Pérouse et al ., ].…”

Section: Geological and Geodynamic Backgroundmentioning

confidence: 99%

Pliocene‐Quaternary orogenic systems in Central Mediterranean: The Apulia‐Southern Apennines‐Tyrrhenian Sea example

2017

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In the Central Mediterranean the Africa‐Eurasia convergence led to the development of complex orogenic systems and back‐arc basins. Throughout Pliocene‐Quaternary times the Southern Apennines accretionary prism migrated toward the Apulia foreland and, contemporaneously, the Tyrrhenian Sea back‐arc basin opened. In this study, we investigated the offshore of the southern Apulia foreland and the Southern Apennines. Using seismic reflection profiles and well data in a dedicated GIS software, we made a detailed stratigraphic analysis, reconstructed the structural pattern, and built 2‐D geological models of the main geological surfaces. The structure of the Apulia region formed during two main tectonic stages: lower Pleistocene complex extensional faulting developed in a transtensional regime and middle‐upper Pleistocene transpression/shortening. The Southern Apennines accretionary prism developed through the Pliocene‐early lower Pleistocene and was overprinted by late lower Pleistocene‐middle Pleistocene NW‐SE sinistral faults. Through linking new data from the accretionary prism and the foreland with previous information from the Tyrrhenian Sea back‐arc, we provide an original interpretation for the relationships between the various provinces that make the Central Mediterranean crustal puzzle and reconstruct the main phases of the evolution of its Pliocene‐Quaternary orogenic cycle. We recognized collisional stages of uncoupled plates, followed by late lower‐middle Pleistocene postcollisional stages of coupled continental plates. This Pleistocene plate reorganization of Central Mediterranean was probably due to the rupture of the Apulia/Ionian slab or to NNW intraplate shortening transmitted from Africa.

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Transition from collision to subduction in Western Greece: the Katouna–Stamna active fault system and regional kinematics

Cited by 38 publications

References 48 publications

Τhe February – March 2019 Seismic Swarm Offshore North Lefkada Island, Greece: Microseismicity Analysis and Geodynamic Implications

Τhe February – March 2019 Seismic Swarm Offshore North Lefkada Island, Greece: Microseismicity Analysis and Geodynamic Implications

Interpretations of Reservoir‐Induced Seismicity May Not Always Be Valid: The Case of Seismicity during the Impoundment of the Kremasta Dam (Greece, 1965–1966)

Pliocene‐Quaternary orogenic systems in Central Mediterranean: The Apulia‐Southern Apennines‐Tyrrhenian Sea example

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Transition from collision to subduction in Western Greece: the Katouna–Stamna active fault system and regional kinematics

Cited by 38 publications

References 48 publications

&Tau;he February &ndash; March 2019 Seismic Swarm Offshore North Lefkada Island, Greece: Microseismicity Analysis and Geodynamic Implications

&Tau;he February &ndash; March 2019 Seismic Swarm Offshore North Lefkada Island, Greece: Microseismicity Analysis and Geodynamic Implications

Interpretations of Reservoir‐Induced Seismicity May Not Always Be Valid: The Case of Seismicity during the Impoundment of the Kremasta Dam (Greece, 1965–1966)

Pliocene‐Quaternary orogenic systems in Central Mediterranean: The Apulia‐Southern Apennines‐Tyrrhenian Sea example

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Τhe February – March 2019 Seismic Swarm Offshore North Lefkada Island, Greece: Microseismicity Analysis and Geodynamic Implications

Τhe February – March 2019 Seismic Swarm Offshore North Lefkada Island, Greece: Microseismicity Analysis and Geodynamic Implications