GNGTS 2017 - 36° Convegno Nazionale

GNGTS 2017 S essione 2.2 403 Below 1 Hz all the stations of Fig. 2b show differences both in the frequency value and in the amplitude value of the peaks. For instance, the station ASB2 displays two major peaks (correspondent to Avellino –AV and Salerno – SA) both centred around 1 Hz, and the station IRC2 displays instead two major peaks centred around 0,5 Hz (Caserta – CE) and 1 Hz (Benevento – BN and Frosinone – Fr). Fig. 2 - Average H/V ratios for: a) regional events; b) local events and c) site with both surface and borehole (144 m deep) stations, specifically at the top the regional events, at the middle the local events and at the bottom the comparison of surface (thin lines) and borehole (thick lines). d) and e) Average H/VM (blue lines) with the relative standard deviations (light blue green).