Regional zonation based on seismic vulnerability using local site effect analysis and potential damage to the city of Medan (North Sumatra, Indonesia) due to earthquake

Abstract Background Microzonation becomes important for big cities like Medan (North Sumatra, Indonesia) as population agglomeration increases in urban areas resulting rapid and unplanned construction. Mitigation efforts must be carried out to minimize losses arising from earthquakes, such loss of life environmental damage, it can done by analyzing seismic susceptibility local site effects. Purpose This study analyzes the potential damage caused hazards city Medan, North Indonesia. The purpose this is provide an overview definition methodology seismic–geotechnical hazard zoning used making maps with case City. Methods While determining zoning, microzonation measurements data parameters are involved. To obtain comprehensive results, were using three methods, namely Multichannel Seismic Analysis Surface Wave (MASW), Spatial Autocorrelation (SPAC), Horizontal-To-Vertical Spectral Ratio (HVSR) 200 measuring points spread throughout Medan. Parameter weighting values population, class, susceptibility, dominant period, land cover, slope, weather class obtained analytic hierarchy process (AHP) method. Results We presented result survey, including MASW, SPAC, HVSR results. In general, medium soil soft dominate almost all city. estimated depth engineering bedrock at a about 291.33 – 735.87 meters ground surface. period ranged 0.0907 s 8.30723 s. Conclusions classified City Sumatra) into several zones, based on their vulnerability effect analysis due earthquakes. necessary future assessment.