Single station measurements Sample Clauses

Single station measurements. The goal of this kind of measurements is the retrieval of the HVSR curve that represents for each frequency, the average ratio between Horizontal (H) to vertical (V) ground motion components of ambient vibrations (SESAME, 2004). Each single-station measurement was executed with a three-directional digital tromograph Tromino Micromed (see xxx.xxxxxxx.xx) with a sampling frequency of 128 Hz and an acquisition time length of 20 minutes. This value represents a good compromise between the celerity of the measurement execution (which is one of the main merits of this technique) and its accuracy, according to the SESAME guidelines and other studies (see, e.g., Xxxxxxx et al., 2005). To provide HVSR curves, the time series relative to each ground motion component was subdivided in non- overlapping time windows of 20 s. For each of these, the signal was corrected for the base line, padded with zeros, and tapered with a Xxxxxxxx window; the relevant spectrogram was smoothed through a triangular window with frequency dependent half-width (5% of central frequency) and the H/V ratio (HVSR) of the spectral components (the former being the geometric mean of North-South and East-West components) was computed for each frequency. Spectral ratios relative to all the time windows considered were then averaged, and a mean HVSR curve was computed along with the relevant 95% confidence interval. Before interpreting HVSR curve in terms of subsoil dynamical properties, we checked the possible occurrence of spurious HVSR peaks (e.g., due to impulsive or strongly localized anthropic sources. To this purpose, we investigated both the time stability of spectral ratios over the recording length and their directionality. The latter was analyzed by estimating the HVSR curves derived by projecting the ground motion along different horizontal directions. If transient directional effects were identified in the directional HVSR curves, the relevant portions of the record were discarded. This check was formalized into a classification procedure previously adopted in the ambient vibration surveys in the area damaged by the L’Aquila earthquake, whose criteria were shared by the research units anticipating in the project and is summarized in the Appendix.
Sample 1
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