Scholarlink

<p>This study aims to map previously undocumented subsurface cavities beneath the Lakhssas Plateau by applying electrical resistivity tomography (ERT), a non-invasive technique that enables precise, metre-scale imaging of karst structures to depths exceeding 30&#xa0;m, thanks to its high sensitivity to the strong resistivity contrast between air-filled voids and surrounding carbonates. Three 2-D ERT profiles (total length = 480&#xa0;m) were acquired across the Fouzart cave system and inverted using a block-constrained least-squares algorithm. The resulting models highlighted two extremely high-resistivity zones (&gt; 5000 Ω.m) that coincide, within ± 2&#xa0;m, with the geometry of a known gallery and reveal an additional, previously uncharted cavity aligned along a dolomitised fracture band. Synthetic modelling with 10–20% Gaussian noise reproduced both anomalies with &lt; 5% RMS misfit, confirming the robustness of the acquisition and inversion strategy. Integrating ERT results with surface mapping demonstrates that void development is guided by a diagenetic corridor, underscoring the method’s value for rapid geohazard assessment and transferable karst exploration worldwide.</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

Non-Invasive imaging of subsurface karst architecture using electrical resistivity tomography: a case study from carbonate terranes in Semi-Arid regions (Fouzart cave, Western Anti-Atlas, Morocco)

  • 期刊论文

  • 发表日期：

    2025年7月31日

查看全文
  • A. Wanaim,
  • M. Ikirri,
  • S. Boutaleb,
  • A. Fadili,
  • M. A. Belfoul,
  • O. Boualla,
  • M. Ait Haddou,
  • F. Z. Echogdali,
  • M. Abioui

摘要

This study aims to map previously undocumented subsurface cavities beneath the Lakhssas Plateau by applying electrical resistivity tomography (ERT), a non-invasive technique that enables precise, metre-scale imaging of karst structures to depths exceeding 30 m, thanks to its high sensitivity to the strong resistivity contrast between air-filled voids and surrounding carbonates. Three 2-D ERT profiles (total length = 480 m) were acquired across the Fouzart cave system and inverted using a block-constrained least-squares algorithm. The resulting models highlighted two extremely high-resistivity zones (> 5000 Ω.m) that coincide, within ± 2 m, with the geometry of a known gallery and reveal an additional, previously uncharted cavity aligned along a dolomitised fracture band. Synthetic modelling with 10–20% Gaussian noise reproduced both anomalies with < 5% RMS misfit, confirming the robustness of the acquisition and inversion strategy. Integrating ERT results with surface mapping demonstrates that void development is guided by a diagenetic corridor, underscoring the method’s value for rapid geohazard assessment and transferable karst exploration worldwide.