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The presence of topography influences the seismic ground motion and mayresult in strong amplifications, generally at the top of hills and reliefs. Theincreasing urbanization of hills requires an accurate estimation of theseeffects even in areas of moderate seismicity. The simplified coefficientsprovided by the Eurocodes8 do not depend on the frequency and underestimate theamplification in many situations, which justifies the development of newmethods based on easily accessible data. The city of Menton, located in thesoutheast of France, between the Alps and the Ligurian basin, is one of themost exposed metropolitan cities. We propose a study of topographic effectsapplied to the Menton area. Topographic amplification is calculated, on a widefrequency band, using the Frequency-Scaled Curvature method, from a DEM and anaverage value of the shear wave velocity. We then propose to apply an automaticclustering approach to classify the amplification curves into five groups withsimilar properties. We then deduce a first microzonation map of the topographiceffects in the Menton area.

Seismic hazard assessment in Menton, France: Topographical site effect zoning considering a semi-empirical approach and a Machine Learning scheme