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<p>Continuous monitoring of seismic activity is essential for the safety assessment and risk management of large dam infrastructures, especially in tectonically active regions. This study presents the setup, operation, and first results of a modern seismic monitoring network in the vicinity of the Enguri arch dam in northwestern Georgia and the nearby Nenskra Valley, where a new hydropower project is planned. The network consists of 4 surface and 4 borehole stations equipped with high-quality broadband seismometers, enabling the detection and precise localization of local seismic events with low magnitudes. From October 2020 to June 2024, 629 seismic events were detected near the Enguri arch dam, with most events occurring at depths of 4 to 8 km and magnitudes between ML 0.0 and ML 2.0. In the Nenskra Valley, 197 events were recorded between July 2022 and December 2023. The collected data provide an essential basis for distinguishing natural from reservoir-induced seismicity and allow for a detailed assessment of current and future seismic risks. Overall, the established monitoring concept delivers high-resolution seismic information, thus contributing significantly to the safety and future planning of hydropower infrastructure in the region.</p>

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Seismisches Monitoring im Betrieb der Enguri-Stauanlage

  • 期刊论文

  • 发表日期：

    2026年4月27日

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  • Michael Frietsch,
  • Andreas Rietbrock,
  • Nazi Tugushi,
  • Nino Tsereteli,
  • Nasim Karamzadeh,
  • Emmanuel Gaucher

摘要

Continuous monitoring of seismic activity is essential for the safety assessment and risk management of large dam infrastructures, especially in tectonically active regions. This study presents the setup, operation, and first results of a modern seismic monitoring network in the vicinity of the Enguri arch dam in northwestern Georgia and the nearby Nenskra Valley, where a new hydropower project is planned. The network consists of 4 surface and 4 borehole stations equipped with high-quality broadband seismometers, enabling the detection and precise localization of local seismic events with low magnitudes. From October 2020 to June 2024, 629 seismic events were detected near the Enguri arch dam, with most events occurring at depths of 4 to 8 km and magnitudes between ML 0.0 and ML 2.0. In the Nenskra Valley, 197 events were recorded between July 2022 and December 2023. The collected data provide an essential basis for distinguishing natural from reservoir-induced seismicity and allow for a detailed assessment of current and future seismic risks. Overall, the established monitoring concept delivers high-resolution seismic information, thus contributing significantly to the safety and future planning of hydropower infrastructure in the region.