A unified seismic hazard assessment in the Euro-Mediterranean region is currently under progress (European FP7 SHARE project). One of the key step in the procedure of hazard assessment is the use of a Ground-Motion Prediction Equation (GMPE) which allow to estimate the level of shaking accordingly to some seismological parameters (earthquake magnitude, distance from source to site...). Typically these models are determined from the analysis of strong ground-motion records. In regions of low to moderate seismicity, as in Western Central Europe no such specific model exists due to the lack of data from strong events and usually models coming from other regions of the world are used (USA, Japan...). However, high-quality data from small earthquakes now exists for these regions, the analysis of which could provide usefull constraints on source processes, attenuation characteristics and site effects at a regional scale. There is a need of research to understand the non-linear behaviour of some parameters, for instance the classical scaling laws which predicts earthquakes stress drops might not be correct and site effects have been shown to depend on the level of shaking. This research will also help to understand where the large uncertainties in ground-motion modelling come from. The results will serve as input in a procedure know as the host-to-target adjustment in order to adapt existing GMPEs to the regional specificities.
Field of science
- /social sciences/law
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