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Abstract:
The installation of seismic instrumentation (broadband seismometers and/or accelerometers) in the immediate vicinity of a sensitive facility (e.g., nuclear site) may be considered a significant investment, but it provides important information to improve the reliability of site-specific seismic hazard studies. Beyond the use of these data to estimate the amplification between a local reference station and a station subject to site effect (classical SSR approach), the introduction of these local records in regional or national databases allows an analysis of the soil-response of these sensitive sites with respect to more global references. In the case of a generalized inversion technique (GIT), it is possible to determine the response of the sites of interest with respect to the same reference as the one used to constrain the inversion. Similarly, in the case of a ground motion models (GMM) derivation, it is possible to analyse the dS2S terms in order to estimate the response of sites of interest relative to the median of the prediction model. This work shows the results obtained using these approaches for two sensitive industrial sites with local instrumentation implemented over a period of about ten years, located in the South-East of France (low to moderate seismicity zone). We discuss the advantages and disadvantages of these approaches with respect to other methods used in site-specific seismic hazard estimation, as well as the minimum deployment duration required.
