Seismic Site Response Assessment Using Predominant Periods and Shear Wave Velocity Estimation in Nador (N-E of Morocco)
Local seismic hazard is influenced by the variation of soil parameters which modulates the propagation of seismic waves through soil. Nador is one of the cities in Morocco which is located in a seismically hazardous region. Investigations using ambient noise and SPT-N values were conducted in order to characterize site effects in the urban area of Nador. The predominant period values obtained vary between 0.2 and 0.5 s; whereas shear wave velocity in superficial soft sediment varies from 156 to 212 m/s. The geotechnical conditions are also used to identify the areas of high impedance contrast. It is found that soil with high predominant period undergoes significant amplification. This is observed in the center and near to the shore of Nador city which is underlaying deep soils with clay and sandy clay deposits. The provided results can be useful for seismic risk studies in the region.