Action 4.2.2 : Characterizing variability and model uncertainties
Up to now, site response calculations usually considered a uniform Vs per layer and the ground propertie variability was accounted for by shifting the modulus value of the whole layer by 2 coefficients around the best estimate value (typically 2/3 and 3/2). This approach poorly represents the reality nor the effects that a spatial variability have on the ground motion. The objective of this task is to develop and/or improve methodologies to account for 1D/2D/3D variability and to assess modelling uncertainties.
- Ground variability into 1D soil column calculations.
- Characterizing 2D variability and calibrating attenuation at high frequencies
- Numerical strategy to properly account for the variability in 2D and possibly in 3D models
- Methodology to properly assess the uncertainties of the models and predictive capabilities of the models, especially when few field data is available
- Quantifying uncertainties related to empirical and numerical approaches for 2D site effect evaluation in low seismicity areas
Methodology to characterize the variability of a site.