The January 2010 Efpalio earthquake sequence in the western Corinth Gulf (Greece)

Sokos, Efthimios; Zahradnı́k, Jiřı́; Kiratzi, Anastasia; Janský, Jaromír; Gallovič, František; Novotný, Oldřich; Kostelecký, Jakub; Serpetsidaki, A.; Tselentis, G‐Akis

doi:10.1016/j.tecto.2012.01.005

Cited by 66 publications

(78 citation statements)

References 41 publications

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“…Seismic hazard related to the other coastal faults has been studied by Boiselet (2014). Moreover, the last major EQs and the microseismicity have shown that the extension is accommodated on a large number of faults, and the last two major EQs in the Western Rift ruptured faults that are blind (i.e., Aigion 1995 EQ, Bernard et al, 1997) or were not described as a major structure before the earthquake (i.e., Efpalio sequence, Sokos et al, 2012). Consequently, numerous questions remain regarding the most appropriate way to assess seismic hazard in this area.…”

Section: Seismic Hazardmentioning

confidence: 99%

Active faulting at the western tip of the Gulf of Corinth, Greece, from high-resolution seismic data

et al. 2015

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International audienceThe Gulf of Corinth is one of the fastest-spreading intra-continental rifts on Earth. GPS data indicate that the rift is currently opening in a NNE-SSW direction, with a rate of extension reaching up to 16 mm yr (super - 1) in its westernmost part. Although the rest of the offshore rift has been well studied, the western tip of the rift is still poorly explored. We present an accurate map of submarine faults in this area based on two high-resolution seismic reflection surveys (single-channel sparker). In the eastern part of the studied area, the sedimentary infill is affected by the known North Eratini, South Eratini, and West Channel faults. Further to the west, the seafloor is mostly flat and is bounded to the north by the normal, south-dipping, Trizonia fault. To the north, the shallower part of the Gulf shows to the east a diffuse pattern of normal and strike-slip deformation, which is replaced to the west by a 7.5 km long SE striking strike-slip fault zone, called the Managouli fault zone. To the westernmost tip of the Gulf, in the Nafpaktos Basin, two fault sets with different strikes are encountered; the one with a NE-SW strike exhibits a clear strike-slip component. The western tip of the Gulf of Corinth is the only part of the Corinth Rift where convincing evidence for strike-slip movement has been found. This fault pattern is likely related to the complex deformation occurring at the diffuse junction at the western tip of the Rift between three crustal blocks: Continental Greece, Peloponnese, and the Ionian Island-Akarnania block

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Section: Seismic Hazardmentioning

confidence: 99%

Active faulting at the western tip of the Gulf of Corinth, Greece, from high-resolution seismic data

et al. 2015

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“…On 2007 April 08, the Trichonida earthquake swarm initiated near the area where the 1975 M = 6.0 earthquake occurred (Evangelidis et al 2008;Kiratzi et al 2008;Kassaras et al 2014). On 2010 January 18, an earthquake doublet occurred near Efpalio beneath the north coasts of the westernmost part of Corinth Gulf with two M w = 5.5 events (Karakostas et al 2012;Sokos et al 2012;Ganas et al 2013). On 2013 May 22, an earthquake swarm that initiated near Aigio, with more than 1500 earthquakes detected in three months (Chouliaras et al 2015;Kapetanidis et al 2015;Mesimeri et al 2016;Kaviris et al 2017).…”

Section: Introductionmentioning

confidence: 99%

Relocation of recent seismicity and seismotectonic properties in the Gulf of Corinth (Greece)

Mesimeri¹,

Karakostas²,

Papadimitriou³

et al. 2017

Geophysical Journal International

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“…The western Corinth rift fault slip rates were inferred from the displacement of geologic markers in the field or from seismic profiles on each individual fault, with the exception of the two blind faults identified by their recent seismic activity (1995 fault, Bernard et al, 1997 and Pyrgos fault, Sokos et al, 2012) and for which the microseismicity recorded close to the fault was transformed into the slip rate on the fault plane. These latter slip rates are therefore subject to a very large uncertainty.…”

Section: Application To the Western Corinth Rift Fault Systemmentioning

confidence: 99%

Methodology for earthquake rupture rate estimates of fault networks: example for the western Corinth rift, Greece

Chartier

Scotti

Lyon‐Caen

et al. 2017

Nat. Hazards Earth Syst. Sci.

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Abstract. Modeling the seismic potential of active faults is a fundamental step of probabilistic seismic hazard assessment (PSHA). An accurate estimation of the rate of earthquakes on the faults is necessary in order to obtain the probability of exceedance of a given ground motion. Most PSHA studies consider faults as independent structures and neglect the possibility of multiple faults or fault segments rupturing simultaneously (fault-to-fault, FtF, ruptures). The Uniform California Earthquake Rupture Forecast version 3 (UCERF-3) model takes into account this possibility by considering a system-level approach rather than an individual-fault-level approach using the geological, seismological and geodetical information to invert the earthquake rates. In many places of the world seismological and geodetical information along fault networks is often not well constrained. There is therefore a need to propose a methodology relying on geological information alone to compute earthquake rates of the faults in the network. In the proposed methodology, a simple distance criteria is used to define FtF ruptures and consider single faults or FtF ruptures as an aleatory uncertainty, similarly to UCERF-3. Rates of earthquakes on faults are then computed following two constraints: the magnitude frequency distribution (MFD) of earthquakes in the fault system as a whole must follow an a priori chosen shape and the rate of earthquakes on each fault is determined by the specific slip rate of each segment depending on the possible FtF ruptures. The modeled earthquake rates are then compared to the available independent data (geodetical, seismological and paleoseismological data) in order to weight different hypothesis explored in a logic tree.The methodology is tested on the western Corinth rift (WCR), Greece, where recent advancements have been made in the understanding of the geological slip rates of the complex network of normal faults which are accommodating the ∼ 15 mm yr −1 north-south extension. Modeling results show that geological, seismological and paleoseismological rates of earthquakes cannot be reconciled with only singlefault-rupture scenarios and require hypothesizing a large spectrum of possible FtF rupture sets. In order to fit the imposed regional Gutenberg-Richter (GR) MFD target, some of the slip along certain faults needs to be accommodated either with interseismic creep or as post-seismic processes. Furthermore, computed individual faults' MFDs differ depending on the position of each fault in the system and the possible FtF ruptures associated with the fault. Finally, a comparison of modeled earthquake rupture rates with those deduced from the regional and local earthquake catalog statistics and local paleoseismological data indicates a better fit with the FtF rupture set constructed with a distance criteria based on 5 km rather than 3 km, suggesting a high connectivity of faults in the WCR fault system.

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The January 2010 Efpalio earthquake sequence in the western Corinth Gulf (Greece)

Cited by 66 publications

References 41 publications

Active faulting at the western tip of the Gulf of Corinth, Greece, from high-resolution seismic data

Active faulting at the western tip of the Gulf of Corinth, Greece, from high-resolution seismic data

Relocation of recent seismicity and seismotectonic properties in the Gulf of Corinth (Greece)

Methodology for earthquake rupture rate estimates of fault networks: example for the western Corinth rift, Greece

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