NAGRA Opalinus Clay (…002 - Version 1
FEP 16.1.8 Seismic activity

In the next one million years, only minor to moderate seismic activity is expected in the Zürcher Weinland. Once the repository is closed, no mechanical damage to the barrier system due to seismic activity is expected. In addition, future earthquakes to be expected in Switzerland will not have magnitudes that cause serious damage to a deep underground tunnel system during the operational phase. Significant earthquake-induced fluid migration can be excluded in the case of Opalinus Clay because of its low hydraulic conductivity and self-sealing capacity.