Minor seismic hazard changes in the broader area of Pournari artificial lake after the first filling (W. Greece)

Pavlou, Kyriaki; Κaviris, George; Kouskouna, V.; Sakkas, G.; Zymvragakis, Angelos; Sakkas, Vassilis; Δρακάτος, Γ.

doi:10.1016/j.ringps.2021.100025

Cited by 7 publications

(5 citation statements)

References 50 publications

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“…Subsequently, the b-value is determined using the maximum likelihood method introduced by Aki (1965). Overall, MAXC is highly reliable and robust and has undergone validation in several PSHA studies (Zhou et al, 2018;Pavlou et al, 2021;Kaviris et al, 2023). The second method, proposed by Godano and Petrillo (2023), offers a rapid and straightforward estimation of M c .…”

Section: Methodsmentioning

confidence: 99%

“…Given the high seismicity of Greece, many seismic hazard assessment studies have been conducted, dating as far back as 1985 (Makropoulos and Burton, 1985) and continuing to the present (Bonatis, 2020;Bonatis et al, 2021;Pavlou et al, 2021;Kaviris et al, 2022aKaviris et al, , 2022bKaviris et al, , 2023. The Ionian Islands are widely recognized as an area of high seismic activity and are among the most seismically active regions in Europe.…”

Section: Introductionmentioning

confidence: 99%

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A Logic-Tree Based Probabilistic Seismic Hazard Assessment for the Central Ionian Islands of Cephalonia and Ithaca (Western Greece)

Kaviris,

Zymvragakis,

Kapetanidis

et al. 2024

Preprint

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The Central Ionian Islands of Cephalonia and Ithaca belong to the most seismically active Greek region, mainly due to the presence of the dextral Cephalonia-Lefkada Transform Fault Zone. The study area has experienced strong earthquakes in the 20th century, including the destructive 1953 sequence with maximum intensity 9.0. The Paliki peninsula, western Cephalonia, hosted two strong earthquakes (Mw= 6.1 and 5.8) in 2014, with ground acceleration reaching ~560 cm/s2 and 735 cm/s2, respectively. This study updates the seismic hazard evaluation in Cephalonia and Ithaca using new data and computational techniques to reduce epistemic uncertainties. The probabilistic approach of Cornell and McGuire was used, and the uncertainties are reduced through data variability of the source models, seismicity data, and Ground Motion Prediction Equations using a logic tree approach, sampled by implementing the Latin Hypercube Sampling method. The spatial distribution of Peak Ground Acceleration and Peak Ground Velocity for return periods of 475 and 950 years indicates low variation in the entire study area and that the Paliki peninsula possesses the highest level of seismic hazard. Additionally, site-specific analysis across the three main towns, Lixouri and Argostoli in Cephalonia and Vathi in Ithaca, reveals that Lixouri has the greatest level of seismic hazard, while Vathi the lowest.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Logic-Tree Based Probabilistic Seismic Hazard Assessment for the Central Ionian Islands of Cephalonia and Ithaca (Western Greece)

Kaviris,

Zymvragakis,

Kapetanidis

et al. 2024

Preprint

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show abstract

“…To account for time periods of incomplete data, the modified b-value (β) was determined using a maximum likelihood method [78]. The ground motion prediction equations (GMPEs) of [79], which have been successfully applied in seismic hazard studies in Greece [80][81][82], were used to obtain PGA values in the final PSHA model. A reverse/strike-slip focal mechanism type and a rock basement were considered in the GMPE, for all areas.…”

Section: Seismic Hazardmentioning

confidence: 99%

“…The PGA and PGV values were computed for a 10% exceedance probability level in 50 years (return period of 475 years) (Figure 7). successfully applied in seismic hazard studies in Greece [80][81][82], were used to obtain PGA values in the final PSHA model. A reverse/strike-slip focal mechanism type and a rock basement were considered in the GMPE, for all areas.…”

Section: Seismic Hazardmentioning

confidence: 99%

Seismological and Ground Deformation Study of the Ionian Islands (W. Greece) during 2014–2018, a Period of Intense Seismic Activity

et al. 2022

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Seismicity in the Ionian Sea (W. Greece) is mainly generated along the Cephalonia–Lefkada Transform Fault Zone (CLTFZ) in the central Ionian, and on the northwestern termination of the Hellenic subduction margin in the south. Joint pre-, co- and post-seismic ground deformation and seismological analysis is performed at the broad Ionian area, aiming to homogeneously study the spatiotemporal evolution of the activity prior to and after the occurrence of strong (M > 6) earthquakes during the period of 2014–2018. The 2014 Cephalonia earthquakes (Mw6.1 and Mw5.9) were generated on a faulting system adjacent to CLTFZ, causing local ground deformation. The post-seismic sequence is coupled in space and time with the 2015 Lefkada earthquake (Mw6.4), which occurred on the Lefkada segment of the CLTFZ. Co-seismic displacement was recorded in the broader area. Seismicity was concentrated along the CLTFZ, while its temporal evolution lasted for several months. The 2018 Zakynthos earthquake (Mw6.7) caused regional deformation and alterations on the near-velocity field, with the seismicity rate remaining above background levels until the end of 2021. In the northern Ionian, convergence between the Apulian platform and the Hellenic foreland occurs, exhibiting low seismicity. Seismic hazard assessment revealed high PGA and PGV expected values in the central Ionian.

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“…PSHA uses an approach that incorporates a range of possible earthquake occurrences and their associated probabilities, providing a more comprehensive and realistic estimation of the seismic hazard [47][48][49][50][51]. There have been various seismic hazard assessment studies for the Greek territory [52][53][54][55][56][57][58][59]. In this paper, we assess seismic hazard by computing PGA, PGV, and S a values for the administrative region of Attica, including its islands, which is critical, as it composes 27% of the total population of the country [60].…”

Section: Introductionmentioning

confidence: 99%

A Logic-Tree Approach for Probabilistic Seismic Hazard Assessment in the Administrative Region of Attica (Greece)

et al. 2023

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Probabilistic Seismic Hazard Assessment (PSHA) was carried out for the administrative region of Attica (Greece). Peak Ground Acceleration (PGA) and Peak Ground Velocity (PGV) values were calculated for return periods of 475 and 950 years for five sub-areas covering the entire region. PGA hazard curves and Uniform Hazard Spectra (UHS) in terms of spectral acceleration (Sa) values were generated for Athens, Methana, and the capitals of each island of Attica (Salamina, Aegina, Poros, Hydra, Spetses, Kythira, and Antikythira). Area sources were adopted from the Euro-Mediterranean Seismic Hazard Model 2013 (ESHM13) and its update, ESHM20, taking into account both crustal and slab tectonic environments. Ground Motion Prediction Equations (GMPEs) proposed for the Greek territory were ranked for PGA and PGV. Each GMPE was reconstructed as a weighted model, accounting for normal and non-normal focal mechanisms for each area source. PGA, PGV, and Sa values were computed using a logic tree, integrating the seismotectonic models as major branches and sub-logic trees, comprised of multiple ranked GMPEs for each area source, as minor branches. The results showed higher seismic hazard values in sub-areas near the Gulf of Corinth and the slab interface, which could indicate a need to revise the active building code in Attica.

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Minor seismic hazard changes in the broader area of Pournari artificial lake after the first filling (W. Greece)

Cited by 7 publications

References 50 publications

A Logic-Tree Based Probabilistic Seismic Hazard Assessment for the Central Ionian Islands of Cephalonia and Ithaca (Western Greece)

A Logic-Tree Based Probabilistic Seismic Hazard Assessment for the Central Ionian Islands of Cephalonia and Ithaca (Western Greece)

Seismological and Ground Deformation Study of the Ionian Islands (W. Greece) during 2014–2018, a Period of Intense Seismic Activity

A Logic-Tree Approach for Probabilistic Seismic Hazard Assessment in the Administrative Region of Attica (Greece)

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