Estimates of Vs30 Based on Constrained H/V Ratio Measurements Alone

摘要: Most seismic codes adopt as a key quantitative parameter the average shear wave velocity in first 30 m of subsoil, commonly calling it Vs30. Estimates Vs30 are therefore required most countries for microzonation both at large-scale well scale single buildings. We propose fast and inexpensive technique to measure based on horizontal vertical spectral ratio (H/V) microtremor recorded station. The experimental H/V is fitted with synthetic curve using constraint thickness superficial layer which always independently known geotechnical practice building design approval. fitting procedure consists three steps: (1) identify depth shallow stratigraphic horizon from data, (2) its corresponding marker (3) use fit one. calculated by assuming tremor wavefield Rayleigh Love waves fundamental mode stratified 1-D soil model. A validity check this has been performed variety geological settings Northern Italy. compares: theoretical phase dispersion curves models derived fits measured ESAC ReMi array surveys, estimates obtained proposed those same sites latter techniques. inferred stratigraphy also compared knowledge. found capable provide, small fraction costs survey times, coherent ReMi. Furthermore, be more informative than techniques, allowing detect deviations subsoil geometry over lengths few meters, correctness was confirmed direct drilling.