The 2020 National Seismic Hazard Model for Georgia (Sakartvelo)

Tsereteli, Nino; Danciu, Laurentiu; Varazanashvili, O.; Şeşetyan, Karin; Qajaia, Lali; Sharia, Tatia; Svanadze, D.; Khvedelidze, Irine B.

doi:10.1007/978-94-024-2046-3_8

Cited by 4 publications

(4 citation statements)

References 79 publications

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“…In this section we consider the influence of the WL change on the seismic regime of the area. The analysis shows that seismic events in the vicinity of the Enguri Dam area occur in the known seismic zones [ 57 , 58 ]. In the following, we show that this activity is associated with variation in the water level in the reservoir and is a typical example of reservoir-induced seismicity (RIS).…”

Section: Resultsmentioning

confidence: 99%

Complexity in Geophysical Time Series of Strain/Fracture at Laboratory and Large Dam Scales: Review

Chélidzé

Matcharashvili

Mepharidze

et al. 2023

Entropy

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One of the interesting directions of complexity theory is the investigation of the synchronization of mechanical behavior of large-scale systems by weak forcing, which is one of manifestations of nonlinearity/complexity of a system. The effect of periodic weak mechanical or electromagnetic forcing leading to synchronization was studied on the laboratory load–spring system as well as on a big dam’s strain data. Due to synchronization, the phase space structure of the forced system strongly depends on the weak forcing intensity–determinism show itself in the recurrence of definite states of the forced system. The nonlinear dynamics of tilts/strains/seismicity near grand dams reflect both the complexity of the mentioned time series, connected with the natural agents (regional and local geodynamics), which were presented even before dam erection, as well as the effects of the water level (WL) variation in the reservoir, which is a quasi-periodic forcing superimposed on the natural geodynamic background. Both these effects are documented by the almost half-century of observations at the large Enguri Dam. The obtained data on the dynamics of strain/seismicity near a large dam can be used for the assessment of the possible risks, connected with the abrupt change of routine dynamics of construction.

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Section: Resultsmentioning

confidence: 99%

Complexity in Geophysical Time Series of Strain/Fracture at Laboratory and Large Dam Scales: Review

Chélidzé

Matcharashvili

Mepharidze

et al. 2023

Entropy

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“…The earthquake catalog for the chosen area encompasses events spanning from 1978 to 2021. Various types of magnitude measurements have been employed to estimate the energetic parameters of earthquakes over different time intervals [45,56]. Up to 2003, the energetic parameters of earthquakes were assessed using surface waves (MLH/MS), primarily for moderate to strong earthquakes with M s ≥ 4.0, employing the regional calibration curve for MS [57,58].…”

Section: Seismicity Datamentioning

confidence: 99%

“…In seismicity analysis, homogenizing earthquake catalogs is crucial. Utilizing conversion equations developed for national data [45,56,61] and regional data [62] allows for catalog harmonization in terms of Ms or Mw magnitude. Until 2003, the most common parameter for earthquake energy assessment was the energy class K. The conversion equation between Mw and K, based on limited data for Azerbaijan [61], and the conversion between Ms and K [63] establish stable correlations drawn from a broad range of Caucasian data.…”

Section: Seismicity Datamentioning

confidence: 99%

Spectral Investigation of the Relationship between Seismicity and Water Level in the Enguri High Dam Area (Georgia)

Telesca,

Tsereteli,

Chelidze

et al. 2024

Geosciences

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A spectral analysis of the time dynamics of seismicity occurring in the Enguri area of Georgia from 1978 to 2021 is performed by means of Schuster’s spectrum analysis, periodogram analysis, and empirical mode decomposition. The results of our analysis suggest that earthquakes around the reservoir (within a 50 km radius from the center of the dam) may be due to changes in water level, featured by the yearly cycle of loading and unloading operations of the reservoir. It is observed that the impacts of water fluctuations are more pronounced in shallower strata (down to 10 km) than deeper ones (down to 20 km); this could indicate that earthquakes occurring at deeper levels may primarily result from tectonic forces, whereas those at shallower depths may be predominantly triggered by reservoir-induced factors.

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“…The network comprises 25 permanently operating short-period and broadband digital seismic stations (21 transmit data in real-time). It continuously monitors seismic events in Georgia and adjacent regions [14].…”

Section: Introductionmentioning

confidence: 99%

Integrated Earthquake Catalog of the Ossetian Sector of the Greater Caucasus

Vorobieva,

Dzeboev,

Dzeranov

et al. 2023

Applied Sciences

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This article is the continuation of a study by authors to create the most complete and representative earthquake catalogs with a unified magnitude scale. The catalog created of the Ossetian sector of the Greater Caucasus (the territory of the Republic of North Ossetia–Alania and adjacent areas) was formed by the aggregation of all available data from Soviet, modern Russian, and Georgian catalogs, as well as the data from the International Seismological Centre. The integration was carried out using the author’s approach based on the modified nearest neighbor method. The integrated catalog of the Ossetian sector of the Greater Caucasus contains 16,285 events for the period 1962–2022. For all events, magnitude estimates are reduced to a unified “proxy-MW” scale. The integration of data from various sources made it possible to significantly replenish the beginning of the aftershock sequence of the Racha earthquake with MW = 7.0, which occurred on 29 April 1991. There has been a change in the level of registration over time. Thus, there is a significant lack of events for the periods 1967–1970 and 1988–1991; starting from 1995, the catalog is complete for magnitude 3.2, and since 2005 for magnitude 2.2. The integration of Soviet and modern Russian and Georgian catalogs made it possible to significantly increase the completeness and representativeness of seismic events in the studied Ossetian sector of the Greater Caucasus. This once again demonstrates both the fundamental importance of merging seismic data from global, national, and regional catalogs and the effectiveness of the author’s developed method.

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The 2020 National Seismic Hazard Model for Georgia (Sakartvelo)

Cited by 4 publications

References 79 publications

Complexity in Geophysical Time Series of Strain/Fracture at Laboratory and Large Dam Scales: Review

Complexity in Geophysical Time Series of Strain/Fracture at Laboratory and Large Dam Scales: Review

Spectral Investigation of the Relationship between Seismicity and Water Level in the Enguri High Dam Area (Georgia)

Integrated Earthquake Catalog of the Ossetian Sector of the Greater Caucasus

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