On the Segmentation of the Cephalonia–Lefkada Transform Fault Zone (Greece) from an InSAR Multi-Mode Dataset of the Lefkada 2015 Sequence

Svigkas, Nikos; Atzori, Simone; Kiratzi, Anastasia; Tolomei, Cristiano; Antonioli, Andrea; Papoutsis, Ioannis; Salvi, Stefano; Kontoes, Charalampos

doi:10.3390/rs11161848

Cited by 6 publications

(3 citation statements)

References 45 publications

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“…The mean thickness of the seismogenic layer along the KTFZ is equal to 12 km, with earthquake focal depths ranging between 3 and 15 km [36]. The large earthquakes that occurred in the study area since 2003 (Figure 2; 2003 with M w = 6.2 in the northern part of Lefkada; 2014 with M w = 6.1 and 6.0 in the Paliki Peninsula in Kefalonia; 2015 with M w = 6.5 in the southern part of Lefkada), along with the one that occurred offshore southeast of the Island of Kefalonia in 1983 with M w = 7.0, have attracted research interest ( [37][38][39][40][41][42][43], among others), and thus a detailed segmentation model for KTFZ is available. Each fault segment considered in this study is modeled using the standard source characterization approach, promoting specific fault segments with fixed endpoints [44,45].…”

Section: Fault Segmentation Model Of Kefalonia Transform Fault Zone A...mentioning

confidence: 99%

Long-Term Recurrence Pattern and Stress Transfer along the Kefalonia Transform Fault Zone (KTFZ), Greece: Implications in Seismic Hazard Evaluation

Kourouklas,

Papadimitriou,

Karakostas

2023

Geosciences

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An effort is exerted to investigate the recurrence pattern of large earthquakes (Mw ≥ 6.0) in the Kefalonia Transform Fault Zone (KTFZ), Greece, by considering the incorporation of the 74-year (1948–2022) evolving stress field. Four earthquake occurrence models—the Poisson, Poisson with the incorporation of the static stress changes (Poisson + ΔCFF), Brownian passage time (BPT) and Brownian passage time with the incorporation of the static stress changes (BPT + ΔCFF)—have been applied to estimate the occurrence probabilities of nearly characteristic earthquakes for the seven fault segments of the study area. The mean recurrence time, Tr, is estimated using the physics-based seismic moment rate conservation method. The results show large variability depending upon fault parameters. Incorporating the state of stress into Tr results in both advanced and delayed recurrence patterns. The occurrence probability estimates for the next 10, 20 and 30 years indicate that the fault segment most likely to be ruptured is the Paliki North fault segment in all models. Overall, the occurrence probabilities, combined with the state of stress along the fault segments, emphasize the high seismic moment rate of the study area. The application of time-dependent models (BPT, BPT + ΔCFF) resulted in significant increases or decreases in the associated seismic hazard.

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Section: Fault Segmentation Model Of Kefalonia Transform Fault Zone A...mentioning

confidence: 99%

Long-Term Recurrence Pattern and Stress Transfer along the Kefalonia Transform Fault Zone (KTFZ), Greece: Implications in Seismic Hazard Evaluation

Kourouklas,

Papadimitriou,

Karakostas

2023

Geosciences

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“…A few years later, on 17 November 2015, another strong earthquake (Mw 6.4) struck the western inland part of the island. Since then, a large body of studies has been carried out concerning the analysis of the co-seismic deformation, the slip distribution, the source parameters, and the slip model [37][38][39][40][41][42]. In addition to the seismotectonic perspective, other researchers have examined the macro-seismic effects of these events via the recording of different types of mass movements as well as the identification and assessment of ground failures [43][44][45].…”

Section: Study Areamentioning

confidence: 99%

Evaluating the Impact of Seismic Activity on the Slope Stability of the Western Coast of Lefkada Island Using Remote Sensing Techniques, Geographical Information Systems, and Field Data

Nikolakopoulos,

Koukouvelas,

Kyriou

et al. 2023

Applied Sciences

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The current research aims to examine the long-term evolution of the western cliffs of Lefkada Island following the occurrence of the last two strong earthquakes, on 14 August 2003 and 17 November 2015, respectively. Medium resolution satellite data (Landsat) and very high-resolution data (Ikonos, Pleiades, and airphotos) were processed in Google Earth Engine and Erdas imagine software, respectively. The study area covers a 20 km-long region of the western cliffs of Lefkada Island, extending from Egremni beach to the South to Komilio beach to the North. Relief, vegetation, and inclination changes were detected in the ArcGis environment. The results were associated with in situ data provided through the installation of a sediment trap. The analysis of the results proved that seismicity is the main factor that formed the western coastline of Lefkada Island, affecting the integrity of the cliffs. Specifically, large earthquakes cause immediate vegetation and topographic (inclination changes, mass movements) modifications in the western cliffs of the island. Meanwhile, small earthquakes (magnitudes < 4.1) contribute to the cliff’s evolution during the inter-seismic era. The intensity of these aforementioned changes was closely related to the seismic activity that occurred in the vicinity of the study area. In addition, it was found that precipitation and wind do not exert a similar influence on the cliff’s evolution.

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“…DInSAR Analysis: SAR interferometry is a well-established method for mapping co-seismic surface deformation [27][28][29] .…”

Section: Optical Satellite Dataset and Processingmentioning

confidence: 99%

Impact assessment of the catastrophic earthquakes of 6 February 2023 in Turkey and Syria via the exploitation of satellite datasets

Fotiou,

Argyriou,

Alatza

et al. 2023

Ninth International Conference on Remote Sensing and Geoinformation of the Environment (RSCy2023)

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Turkey due to its location within the collision zone between the Eurasian, African and Arabian Plates, is a region prone to earthquakes. The country mostly lies on the Anatolian micro-plate, bounded by two major strike-slip fault zones, i.e., the North and the East Anatolian Fault. On 6 February 2023, the activation of a large segment of the East Anatolian Fault generated two earthquakes of 7.8 and 7.5 magnitude, in southern Turkey. The seismic risk is greater along the plate boundaries, however due to the frequency of earthquake occurrence throughout Turkey, detailed seismic risk maps are crucial and need to be continuously updated towards operational purposes, and as the optimal means towards decision making for disaster risk reduction. Extensive Synthetic Aperture Radar (SAR) satellite image analysis was performed to determine ground displacements caused by the seismic sequence in the wider area around the two epicenters. Pre-seismic line of sight displacements, as well as co-seismic deformation, were estimated, providing critical information about the surface rupture and the overall ground deformation in the affected areas. Earthquakes can induce landslides and other ground displacements causing extensive damage to buildings and infrastructure. Therefore, optical (e.g., Sentinel-2, PlanetScope) and SAR (Sentinel-1) imagery were exploited as a useful tool for assessing the impact of earthquakes on the ground. The monitoring and mapping of these changes, in conjunction with SAR analysis, as well as information on building infrastructure and population density, highlight the overall damage assessment in the region, thus, allowing a better understanding of the impact of earthquakes while providing a more effective response and recovery efforts for decision makers and local authorities towards disaster risk reduction.

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On the Segmentation of the Cephalonia–Lefkada Transform Fault Zone (Greece) from an InSAR Multi-Mode Dataset of the Lefkada 2015 Sequence

Cited by 6 publications

References 45 publications

Long-Term Recurrence Pattern and Stress Transfer along the Kefalonia Transform Fault Zone (KTFZ), Greece: Implications in Seismic Hazard Evaluation

Long-Term Recurrence Pattern and Stress Transfer along the Kefalonia Transform Fault Zone (KTFZ), Greece: Implications in Seismic Hazard Evaluation

Evaluating the Impact of Seismic Activity on the Slope Stability of the Western Coast of Lefkada Island Using Remote Sensing Techniques, Geographical Information Systems, and Field Data

Impact assessment of the catastrophic earthquakes of 6 February 2023 in Turkey and Syria via the exploitation of satellite datasets

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