Spectral coincidences of background noise between soil and existing buildings in Imzouren city,Morocco [Coïncidences spectrales du bruit de fond entre sol et bâti existant dans la ville d'Imzouren,Maroc]

The resonance of a building with the ground occurs when its free oscillations frequency is close to the ground's one (frequency (hz) is the number of oscillations per second of a building). the oscillation amplitudes then,increase to a considerable extent and become a particularly destructive phenomenon,inducing more damage during seismic activity. we present the results of the comparison between the values of the natural frequencies of the different categories of buildings (ranging from a minimum value of 2.47 hz and a maximum value of 14.3 hz,extensive band),and the natural frequencies of the soil [0.931 to 4,905 hz]. the comparison of the frequency values in zone 3 and zone 4 (spatial frequency distribution map of the city imzouren) with those of some buildings suggests the possibility to have the phenomenon of resonance ground-building occurrence in these areas in case of seismic shaking.