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<p>Morocco, being a country with a diverse soil cover, experiences variations in earthquake ground motion due to the presence of thick sediments in some areas. Unfortunately, there is currently a lack of available estimates regarding site effects in Morocco using the standard spectral ratio technique. The SSR method was chosen because it allows the estimation of site amplification effects using recorded earthquake data, providing a better understanding of deeper soil layers compared to ambient noise methods like HVSR. Unlike HVSR, SSR provides better resolution of site-specific ground motion characteristics and is less sensitive to anthropogenic noise. Also, because it is known as the most reliable method for site response estimation, site effects, which are influenced by factors such as geology, topography, earthquake magnitude, and distance, play a significant role in determining the levels of ground motion. This study aims to evaluate the impacts of site effects in a specific area of Morocco by identifying regions that are exposed to higher levels of ground motion from 11 stations installed between 2009 and 2012 as part of the Picasso Project. These sites exhibit a range of geological characteristics, varying from rock formations to soft soils. The PM21 station is selected as a reference. The obtained results show varying amplification factors, with soil sites experiencing higher amplification at lower frequencies, while stiff or rocky sites show lower amplification at higher frequencies. Two distinct categories can be identified: one in northern Morocco with significant amplification (PM04, PM05, PM07, PM08, PM11, PM36), and second group in central-eastern Morocco with a lesser degree of amplification (PM22, PM23, PM24, PM25, PM26). These results correlate well with the geological characteristics of the areas. This research enhances understanding of seismic risks and seismic building code in Morocco (RPS2011). Expanding this investigation to the southwest is conceivable, where the last catastrophic magnitude 6.8 shaking of 2023 occurred.</p>

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Site Effects Determination in Different Regions of Morocco Using the Standard Spectral Ratio

  • 期刊论文

  • 发表日期：

    2025年4月28日

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  • Abderrahim Boulanouar,
  • Himanshu Mittal,
  • Zian Ahmed,
  • Abdelmalek Mellouk,
  • Abdelaali Rahmouni

摘要

Morocco, being a country with a diverse soil cover, experiences variations in earthquake ground motion due to the presence of thick sediments in some areas. Unfortunately, there is currently a lack of available estimates regarding site effects in Morocco using the standard spectral ratio technique. The SSR method was chosen because it allows the estimation of site amplification effects using recorded earthquake data, providing a better understanding of deeper soil layers compared to ambient noise methods like HVSR. Unlike HVSR, SSR provides better resolution of site-specific ground motion characteristics and is less sensitive to anthropogenic noise. Also, because it is known as the most reliable method for site response estimation, site effects, which are influenced by factors such as geology, topography, earthquake magnitude, and distance, play a significant role in determining the levels of ground motion. This study aims to evaluate the impacts of site effects in a specific area of Morocco by identifying regions that are exposed to higher levels of ground motion from 11 stations installed between 2009 and 2012 as part of the Picasso Project. These sites exhibit a range of geological characteristics, varying from rock formations to soft soils. The PM21 station is selected as a reference. The obtained results show varying amplification factors, with soil sites experiencing higher amplification at lower frequencies, while stiff or rocky sites show lower amplification at higher frequencies. Two distinct categories can be identified: one in northern Morocco with significant amplification (PM04, PM05, PM07, PM08, PM11, PM36), and second group in central-eastern Morocco with a lesser degree of amplification (PM22, PM23, PM24, PM25, PM26). These results correlate well with the geological characteristics of the areas. This research enhances understanding of seismic risks and seismic building code in Morocco (RPS2011). Expanding this investigation to the southwest is conceivable, where the last catastrophic magnitude 6.8 shaking of 2023 occurred.