Evidence of amplification effects in fault zone related to rock mass jointing

摘要: Results of geological, geomechanical and seismometric investigations aiming at the analysis seismic response in a carbonate ridge Nera River valley (Central Apennines – Italy) are discussed. Geological surveys were aimed defining stratigraphic structural setting outcropping formations jointing conditions rock mass. Velocimetric records both ambient noise small-magnitude earthquakes analysed order to identify amplification conditions. The was carried out time domain, through directional energy evaluation, frequency H/V spectral ratios with respect reference station. A local factor estimated from Housner intensity. study revealed significant fault zone. This effect observed intensely jointed mylonitic masses, located inside moderately is result specific geometries impedance contrasts. map zones prone ground motion constructed, taking into account masses investigated ridge. relied on an integrated methodological approach, which combined available data under union intersection criteria.