Nonlinear Dynamics, 51(3), 399–407p. (2008) DOI:10.1007/s11071-007-9219-0

Increase of order in seismic processes around large reservoir induced by water level periodic variation

T. Matcharashvili, T. Chelidze, J. Peinke

The importance of small periodic influences on the complex systems behavior is well acknowledged. In the present research, the possible impact of water level variation in large reservoir on the dynamics of local seismic activity was investigated. Large reservoirs located in the seismically active zones are often considered as a factor, quantitatively and qualitatively influencing earthquakes generation. During impoundment or after it, both the number and magnitude of earthquakes around reservoir significantly increases. After several years, these changes in earthquake generation, named as reservoir-induced seismicity (RIS) essentially decrease down to the level, when lesser earthquakes occur with lower magnitudes. To explain this decrease, the authors of the present paper recently proposed the model of phase synchronization of local seismic activity by the periodic variation of the water level – reservoir-induced synchronization of seismicity (RISS).

Generally, RISS presumes a kind of control of local seismic activity by synchronizing small external periodic influence and hence increase of order in dynamics of regional seismic activity. To reveal these changes in dynamics of phase-synchronized seismic activity around large reservoir field, seismic and water level variation data were analyzed in the present work. Laboratory stick-slip acoustic emission data as a model of natural seismicity were also analyzed.

The evidence is presented that increase of order in dynamics of daily earthquake occurrence, earthquakes temporal, and energy distribution took place around Enguri high dam water reservoir (Western Georgia) during the periodic variation of the water level in the lake.

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