Earthquake-induced liquefaction in the coastal zone, Case of Martil city, Morocco

According to historical documents and Moroccan earthquakes catalogs, the coastal zone has suffered in past from several earthquakes. Understanding how sedimentary basins respond seismic-wave energy generated by earthquake events is a significant concern for seismic-hazard estimation risk analysis. The main goal of this study determine distribution natural frequency value (F), amplification factor (A), soil vulnerability index (Kg) were carried out as an indicator liquefaction potential sites Martil city based on microtremor measurements. Liquefaction assessment was done at 96 stations using HVSR approach provided Nakamura (1989). analysis results, predominant values range about 0.31 5.63 Hz, 3 15. Based these parameters, Kg determined, which can be used parameter calculating area. This shows supporting evidence first time that microtremors excellent alternative area's liquefaction.