Probabilistic Seismic Hazard Assessment for the Broader Messinia (SW Greece) Region

Κaviris, George; Zymvragakis, Angelos; Bonatis, Pavlos; Sakkas, G.; Kouskouna, V.; Voulgaris, Nicholas

doi:10.1007/s00024-022-02950-z

Cited by 11 publications

(12 citation statements)

References 68 publications

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“…In addition, the numerous detections in CAT2 1–3 enabled us to explore possible b -value temporal variations that may have appeared on the Perachora peninsula during the swarm. The b -value expresses the relative numbers of smaller- to larger-magnitude earthquakes and constitutes an integral part of all seismic hazard studies [ 61 , 62 ]. Such temporal variations may reflect changes in the state of stress as the b -value is considered inversely proportional to the differential stress [ 44 , 45 ].…”

Section: Resultsmentioning

confidence: 99%

Cluster Analysis of Seismicity in the Eastern Gulf of Corinth Based on a Waveform Template Matching Catalog

Kapetanidis

Michas

Spingos

et al. 2023

Sensors

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The Corinth Rift, in Central Greece, is one of the most seismically active areas in Europe. In the eastern part of the Gulf of Corinth, which has been the site of numerous large and destructive earthquakes in both historic and modern times, a pronounced earthquake swarm occurred in 2020–2021 at the Perachora peninsula. Herein, we present an in-depth analysis of this sequence, employing a high-resolution relocated earthquake catalog, further enhanced by the application of a multi-channel template matching technique, producing additional detections of over 7600 events between January 2020 and June 2021. Single-station template matching enriches the original catalog thirty-fold, providing origin times and magnitudes for over 24,000 events. We explore the variable levels of spatial and temporal resolution in the catalogs of different completeness magnitudes and also of variable location uncertainties. We characterize the frequency–magnitude distributions using the Gutenberg–Richter scaling relation and discuss possible b-value temporal variations that appear during the swarm and their implications for the stress levels in the area. The evolution of the swarm is further analyzed through spatiotemporal clustering methods, while the temporal properties of multiplet families indicate that short-lived seismic bursts, associated with the swarm, dominate the catalogs. Multiplet families present clustering effects at all time scales, suggesting triggering by aseismic factors, such as fluid diffusion, rather than constant stress loading, in accordance with the spatiotemporal migration patterns of seismicity.

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Section: Resultsmentioning

confidence: 99%

Cluster Analysis of Seismicity in the Eastern Gulf of Corinth Based on a Waveform Template Matching Catalog

Kapetanidis

Michas

Spingos

et al. 2023

Sensors

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“…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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“…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%

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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Probabilistic Seismic Hazard Assessment for the Broader Messinia (SW Greece) Region

Cited by 11 publications

References 68 publications

Cluster Analysis of Seismicity in the Eastern Gulf of Corinth Based on a Waveform Template Matching Catalog

Cluster Analysis of Seismicity in the Eastern Gulf of Corinth Based on a Waveform Template Matching Catalog

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

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

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