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| Titel |
Relationship between seismicity and water level in the Enguri high dam area (Georgia) using the singular spectrum analysis |
| VerfasserIn |
L. Telesca, T. Matcharasvili, T. Chelidze, N. Zhukova |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1561-8633
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| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Science ; 12, no. 8 ; Nr. 12, no. 8 (2012-08-07), S.2479-2485 |
| Datensatznummer |
250011042
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| Publikation (Nr.) |
 copernicus.org/nhess-12-2479-2012.pdf |
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| Zusammenfassung |
| The declustered seismic catalog from 1965 to 2010 around the Enguri high dam
reservoir in western Georgia was analyzed using the singular spectrum
analysis (SSA) technique in order to investigate the relationship of local
seismicity with the reservoir water variations. In particular, the seismic
activity was analyzed in two periods: a "reference" period, from 1965 to
1970, before the start of dam building in 1971; and an "active" period,
from 1978 to 2010, in which the influence of the reservoir was significantly
effective on the seismic activity (since the first flooding of the dam
occurred in 1978). The SSA was applied to both the monthly number of
earthquakes and the time series of the monthly mean of the water level. The
first four reconstructed components explained most of the total variance in
both seismicity and water level. Clear signatures of the annual oscillation
linked with the loading/unloading operations of the dam are present in the
periodogram of the second and the third reconstructed components of the
seismic activity during the "active" period. Such annual cycle is absent
in the periodogram of the reconstructed components of the seismic activity
during the "reference" period. This is a clear indication of the
reservoir-induced character of the seismicity around the Enguri dam. |
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