A dense seismological array using up to 19 high‐sensitivity intermediate period sensors was deployed during 1 yr on and around the Saint‐Guérin arch dam in the Alps to (1) quantify the spatial variability of earthquake motions at the base of the dam and (2) monitor the changes in the dynamic response of the dam and its surroundings caused by environmental forcings. The Saint‐Guérin experiment is the first high‐resolution seismological monitoring campaign performed on a French arch dam with open data access to the seismological and engineering community from June 2019.

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