Scholarlink

<p>The seismic analysis of soil characteristics is a crucial step in studying seismic hazards and evaluating site conditions. This study, conducted in the Sidi Ifni region (Morocco), aims to assess the nature of the soils and the depth of the bedrock, based on Moroccan seismic regulations. It combines analysis of multichannel surface waves (MASW) with the spectral-ratio technique (H/V) for ambient seismic noise. In total, 15 sites were studied using MASW with a seismograph coupled to geophones with a natural frequency of 4.5&#xa0;Hz, aiming to determine the shear wave velocity profiles Vs and calculate Vs<sub>30</sub>, while 100 sites were analyzed using the H/V method with a TROMINO seismograph to identify the fundamental frequency of the ground (F0). The MASW survey revealed sites with Vs<sub>30</sub> values exceeding 760&#xa0;m/s, corresponding to shallow rock bases, and others with values between 515 and 760&#xa0;m/s, indicative of firm soils underlain by weathered rock. H/V spectral ratios showed fundamental frequencies (F0) ranging from 0.9 to 11.9&#xa0;Hz, highlighting heterogeneous geological conditions and variable seismic amplification. This approach enables the identification of zones with distinct resonance frequencies, which, when integrated with MASW results, help refine soil classification and seismic response. Comparing both datasets further improves the selection of appropriate methods for estimating lithological site effects based on soil geophysical properties.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Seismic characterization of the Western Sidi Ifni region (Morocco): insights from surface wave and ambient vibration methods

  • 期刊论文

  • 发表日期：

    2026年3月12日

查看全文
  • Salah Lamine,
  • Abdessamad Najine,
  • Hassan Lemacha,
  • Wissam Lachhab,
  • Abdessamad Hilali,
  • Amroumoussa Benmoussa,
  • Hiba Toubali,
  • Omaima Khatir,
  • Khadija Naciri,
  • Salahddine Didi,
  • Said Bouhachm

摘要

The seismic analysis of soil characteristics is a crucial step in studying seismic hazards and evaluating site conditions. This study, conducted in the Sidi Ifni region (Morocco), aims to assess the nature of the soils and the depth of the bedrock, based on Moroccan seismic regulations. It combines analysis of multichannel surface waves (MASW) with the spectral-ratio technique (H/V) for ambient seismic noise. In total, 15 sites were studied using MASW with a seismograph coupled to geophones with a natural frequency of 4.5 Hz, aiming to determine the shear wave velocity profiles Vs and calculate Vs30, while 100 sites were analyzed using the H/V method with a TROMINO seismograph to identify the fundamental frequency of the ground (F0). The MASW survey revealed sites with Vs30 values exceeding 760 m/s, corresponding to shallow rock bases, and others with values between 515 and 760 m/s, indicative of firm soils underlain by weathered rock. H/V spectral ratios showed fundamental frequencies (F0) ranging from 0.9 to 11.9 Hz, highlighting heterogeneous geological conditions and variable seismic amplification. This approach enables the identification of zones with distinct resonance frequencies, which, when integrated with MASW results, help refine soil classification and seismic response. Comparing both datasets further improves the selection of appropriate methods for estimating lithological site effects based on soil geophysical properties.