Velocity gradients choice affecting seismic site response in deep alluvial basins: Application to the Venetian Plain (Northern Italy)
نویسندگان
چکیده
Abstract The average shear-wave velocity of the first 30 metres subsoil and depth engineering bedrock are considered key parameters for simplified seismic site response modelling. However, a reliable estimate amplification should consider entire profile from ground surface down to bedrock. In deep alluvial basins, typical geological context where soil–bedrock interface may lie below penetration most common prospecting methods, only shallow can be defined in detail, while deeper structures commonly extrapolated with linear equations. choice realistic interpolation between soil still remains an open issue. We compute 1D two sectors Venetian Plain (Northern Italy) characterised by gravelly sandy formations. model columns using theoretical non-linear gradients proposed literature basins. numerical modelling results, terms strong motion parameters, show variations up 20%. effect is also evaluated comparing simulations real accelerometers recorded borehole seismometer station located at top borehole. These results demonstrate that selection gradient crucial characterisation particular, study suggests which conservative among ones tested hazard estimation.
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ژورنال
عنوان ژورنال: Journal of Geophysics and Engineering
سال: 2022
ISSN: ['1742-2140', '1742-2132']
DOI: https://doi.org/10.1093/jge/gxab067