  The presence of topography influences the seismic ground motion and may
result in strong amplifications, generally at the top of hills and reliefs. The
increasing urbanization of hills requires an accurate estimation of these
effects even in areas of moderate seismicity. The simplified coefficients
provided by the Eurocodes8 do not depend on the frequency and underestimate the
amplification in many situations, which justifies the development of new
methods based on easily accessible data. The city of Menton, located in the
southeast of France, between the Alps and the Ligurian basin, is one of the
most exposed metropolitan cities. We propose a study of topographic effects
applied to the Menton area. Topographic amplification is calculated, on a wide
frequency band, using the Frequency-Scaled Curvature method, from a DEM and an
average value of the shear wave velocity. We then propose to apply an automatic
clustering approach to classify the amplification curves into five groups with
similar properties. We then deduce a first microzonation map of the topographic
effects in the Menton area.
