Seismic noise measurements in the city of Trieste in order to plan an urban seismic network

The seismic motion can be modified by local geological conditions, which can cause changes in the amplitude, frequency, and duration of earthquake’s seismic waves. For this reason, alongside an assessment of a large scale basic seismic hazard, it is of primary importance to evaluate a local seismic hazard, which takes into account the geological and geomorphological features that characterize the studied area. In this work the results of a seismic noise measures campaign carried out in the city of Trieste during the 2022 summer are presented. 32 measurements were carried out in the different homogeneous microzones defined for the city of Trieste, in key positions of the CLE chart (Emergency Boundary Condition), furthermore taking into account the geological, geomorphological, hydrogeological features, and the university building positions.