Landslides near Enguri dam (Caucasus, Georgia) and possible seismotectonic effects
| Autor: | Alessandro Tibaldi, Z. Gogoladze, Nino Tsereteli, Thomas Oommen, Paolo Oppizzi, John S. Gierke |
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| Přispěvatelé: | Tibaldi, A, Oppizzi, P, Gierke, J, Oommen, Tsereteli, N, Gogoladze, Z |
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
lcsh:GE1-350
Peak ground acceleration 010504 meteorology & atmospheric sciences Water table Field data lcsh:QE1-996.5 lcsh:Geography. Anthropology. Recreation Landslide Slip (materials science) 010502 geochemistry & geophysics Fault scarp 01 natural sciences lcsh:TD1-1066 lcsh:Geology lcsh:G Water reservoir GEO/03 - GEOLOGIA STRUTTURALE Subaerial General Earth and Planetary Sciences fault landslide Georgia lcsh:Environmental technology. Sanitary engineering Geomorphology lcsh:Environmental sciences Geology 0105 earth and related environmental sciences |
| Zdroj: | Natural Hazards and Earth System Sciences, Vol 19, Pp 71-91 (2019) |
| ISSN: | 1684-9981 |
| Popis: | The Enguri dam and water reservoir, nested in the southwestern Caucasus (Republic of Georgia), are surrounded by steep mountain slopes. At a distance of 2.5 km from the dam, a mountain ridge along the reservoir is affected by active deformations with a double vergence. The western slope, directly facing the reservoir, has deformations that affect a subaerial area of 1.2 km2. The head scarp affects the Jvari–Khaishi–Mestia main road with offsets of man-made features that indicate slip rates of 2–9 cm yr−1. Static, pseudostatic and Newmark analyses, based on field and seismological data, suggest different unstable rock volumes based on the environmental conditions. An important effect of variation of the water table is shown, as well as the possible destabilization of the slope following seismic shaking, compatible with the expected local peak ground acceleration. This worst-case scenario corresponds to an unstable volume on the order of up to 48±12×106 m3. The opposite, eastern slope of the same mountain ridge is also affected by wide deformation affecting an area of 0.37 km2. Here, field data indicate 2–5 cm yr−1 of slip rates. All this evidence is interpreted as resulting from two similar landslides, whose possible causes are discussed, comprising seismic triggering, mountain rapid uplift, river erosion and lake variations. |
| Databáze: | OpenAIRE |
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