GNGTS 2017 - 36° Convegno Nazionale

GNGTS 2017 S essione 2.2 343 Fig. 1 - Location of the ambient noise measurement sites at Amatrice and polar diagrams of average ratios HVNR between the spectral amplitudes of horizontal and vertical components of noise as function of frequency (reported radially) and of the azimuth of the horizontal component. Spectral ratios are represented through the reported colour scale. For each site, polar diagrams relative to recordings acquired at different times are shown. Fig. 2 - Location of the ambient noise measurement sites at Amatrice and polar diagrams of average ellipticity values HVIP estimated for wave packets identified as Rayleigh waves within the noise recordings, plotted through a colour scale as function of frequency (radially) and of azimuth of the Rayleigh wave direction. For each site, polar diagrams relative to recordings acquired at different times are shown.