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The paper presents the results of an ambient vibration monitoring campaignconducted on so-called Clock Tower (Torre delle Ore), one the best known andmost visited monuments in the historic centre of Lucca. The vibrations of thetower were continuously monitored from November 2017 to March 2018 usinghigh-sensitivity instrumentation. In particular, four seismic stations providedby the Istituto Nazionale di Geofisica e Vulcanologia and two three-axialaccelerometers developed by AGI S.r.l., spin-off of the Istituto Nazionale diAstrofisica, were installed on the tower. The measured vibration level wasgenerally very low, since the structure lies in the middle of a limited trafficarea. Nevertheless, the availability of two different types of highly sensitiveand accurate instruments allowed the authors to follow the dynamic behaviour ofthe tower during the entire monitoring period and has moreover providedcross-validation of the results.

Ambient vibrations of age-old masonry towers: results of long-term dynamic monitoring in the historic centre of Lucca