Abstract: T. Chelidze, T. Matcharashvili, V. Abashidze, N. Dovgal, E. Mepharidze, L. Chelidze (2021)

In: Building Knowledge for Geohazard Assessment and Management in the Caucasus and other Orogenic Regions, Springer, Dordrecht, 185–204p. (2021) DOI:10.1007/978-94-024-2046-3_10

Time series analysis of fault strain accumulation around large dam: The case of enguri dam, greater caucasus

The 271-m-high Enguri arch dam, still one of the highest of this kind in operation in the world, was built in the canyon of the Enguri river (western Georgia) in the 1970s. It is located in a zone of high seismic hazard and is close to the Ingirishi strike-slip active fault. The strong seismic activity, as well as the great number of people living downstream of the dam, make this facility a potential source of a major catastrophe in Georgia. Thus, the Enguri Dam, with its 1 billion cubic meters water reservoir, should be under permanent monitoring. At the same time, this area is an amazing natural laboratory, where researchers can investigate both tectonic and geotechnical issues and the effects of load-unload processes at the artificial reservoir, i.e. the reaction to a controllable loading of the Earth crust. This is an important scientific topic, connected with the fundamental problem of reservoir-induced earthquakes as well as with environmental geotechnical problems, related to the security of major dams in general. The complexity analysis methods applied to time series of the fault strain monitoring data enables discriminating seismic events derived by the human activities and background seismicity. Such complexity analysis provides a new approach â€“ Reservoir Synchronized Induced Seismicity, or RSIS â€“ for a quantitative assessment of reservoir water level load on the (synchronized/ordered) temporal pattern of local seismicity. Besides, analysis of complexity in the fault strain monitoring data can provide also some early warning methods for signaling dangerous deviations of fault strains and dam tilts temporal behavior from the stable (background) pattern.

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