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<p>The Golay landslide on March 29, 2019, in North Khorasan Province, Iran, caused significant damage to residential and agricultural areas due to heavy rainfall. Four electrical resistivity tomography profiles and five boreholes were conducted to understand the landslide geometry, and the results were compared. Microtremor data were recorded at 80 stations using a three-channel Lennartz instrument to assess seismic site response. Structural parameters such as resonance frequency, amplification amplitude, and directivity were analyzed using Geopsy software, which generated Horizontal-to-Vertical Spectral Ratio (HVSR) and rotational spectral ratio curves. Out of 80 stations, 68 met peak clarity criteria, while the rest were excluded from further analysis. Findings indicated a main resonance frequency band of 1 to 3 Hz with an average amplification amplitude of around 4. Resonance frequency increased with decreasing elevation, except in the new slide toe area, where higher frequencies were due to mixed slipped materials. Amplification amplitude was more affected by the landslide body than by elevation. Directivity was observed at 14 stations, primarily at the toe of the old and new landslides. Notably, 6 out of 8 stations in the toe area exhibited directivity aligned with the slope and landslide directions.</p>

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Dynamic response evaluation of landslide to ambient noise using the HVSR method, the case of golay landslide in North Khorasan Province, Iran

  • 期刊论文

  • 发表日期：

    2025年5月1日

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  • Mojtaba Hosseinzadeh,
  • Abdollah Sohrabi-Bidar,
  • Reza Khajevand,
  • Saeed Mohammad Sabouri

摘要

The Golay landslide on March 29, 2019, in North Khorasan Province, Iran, caused significant damage to residential and agricultural areas due to heavy rainfall. Four electrical resistivity tomography profiles and five boreholes were conducted to understand the landslide geometry, and the results were compared. Microtremor data were recorded at 80 stations using a three-channel Lennartz instrument to assess seismic site response. Structural parameters such as resonance frequency, amplification amplitude, and directivity were analyzed using Geopsy software, which generated Horizontal-to-Vertical Spectral Ratio (HVSR) and rotational spectral ratio curves. Out of 80 stations, 68 met peak clarity criteria, while the rest were excluded from further analysis. Findings indicated a main resonance frequency band of 1 to 3 Hz with an average amplification amplitude of around 4. Resonance frequency increased with decreasing elevation, except in the new slide toe area, where higher frequencies were due to mixed slipped materials. Amplification amplitude was more affected by the landslide body than by elevation. Directivity was observed at 14 stations, primarily at the toe of the old and new landslides. Notably, 6 out of 8 stations in the toe area exhibited directivity aligned with the slope and landslide directions.