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Use of Ambient Noise: From Spectral Amplitude Variability to H/V Stability

Abstract : The study of the variation over time of both spectral amplitudes and H/V curves, has been performed on three different sites, two close to cities and one in the countryside, during periods varying from week to over a month. It demonstrates the robustness of the H/V technique to give consistent peak frequency values. In particular, H/V peak frequencies, either fundamental (f0) or natural (fx, x•1), are not affected by weather nor the level of human activity. However, while fundamental H/V peak amplitudes are stable, they proved rather unstable for natural (secondary) peak. Spectral amplitude curves are very variable but follow human activity cycles from week-week end and day-night variations down to a very small scale, such as lunch breaks. Finally, the frequency limit between anthropic noise and natural noise, commonly taken at 1 Hz, is not straightforward and is varying from site to site from 0.7-0.8 Hz up to 2-3 Hz.
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Submitted on : Thursday, December 11, 2008 - 10:34:10 AM
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B. Guillier, Jean-Luc Chatelain, Sylvette Bonnefoy-Claudet, E. Haghshenas. Use of Ambient Noise: From Spectral Amplitude Variability to H/V Stability. Journal of Earthquake Engineering, Taylor & Francis, 2007, 11 (6), pp.925 à 942. ⟨10.1080/13632460701457249⟩. ⟨insu-00346148⟩



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