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<p>This study investigates the application of electromagnetic, conductivity, and in-phase magnetic susceptibility surveys to locate and characterize a historic shipwreck buried in the intertidal sandy sediments of Nekor Bay, Morocco. The shipwreck is elongated, measuring approximately 2 m wide and 40 m long. Using the EM31-MK2 electromagnetic instrument, fieldwork was carried out to measure both soil conductivity and the in-phase component. The conductivity map revealed a distinct low-conductivity anomaly (1–55 mS/m) at the shipwreck's location, attributed to elongated metal pieces and wood, in contrast to higher conductivity values (55–400 mS/m) in the surrounding salt-saturated sand. Similarly, in-phase measurements, more sensitive to metallic bodies, identified a localized negative anomaly (−20 to 0 ppt), indicative of the buried metallic objects. The integration of conductivity and magnetic susceptibility surveys effectively pinpointed the shipwreck’s location and provided insights into its dimensional characteristics. These results highlight the utility of geophysical methods in identifying submerged archaeological structures in intertidal zones and contribute to the broader understanding of historical shipwrecks.</p>

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Geophysical mapping of a shipwreck in Nekor Bay (Morocco)

  • 期刊论文

  • 发表日期：

    2026年7月21日

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  • Morad Taher,
  • Omar Delgado-Rodríguez,
  • Hinde Cherkaoui Dekkaki,
  • Issam Etebaai

摘要

This study investigates the application of electromagnetic, conductivity, and in-phase magnetic susceptibility surveys to locate and characterize a historic shipwreck buried in the intertidal sandy sediments of Nekor Bay, Morocco. The shipwreck is elongated, measuring approximately 2 m wide and 40 m long. Using the EM31-MK2 electromagnetic instrument, fieldwork was carried out to measure both soil conductivity and the in-phase component. The conductivity map revealed a distinct low-conductivity anomaly (1–55 mS/m) at the shipwreck's location, attributed to elongated metal pieces and wood, in contrast to higher conductivity values (55–400 mS/m) in the surrounding salt-saturated sand. Similarly, in-phase measurements, more sensitive to metallic bodies, identified a localized negative anomaly (−20 to 0 ppt), indicative of the buried metallic objects. The integration of conductivity and magnetic susceptibility surveys effectively pinpointed the shipwreck’s location and provided insights into its dimensional characteristics. These results highlight the utility of geophysical methods in identifying submerged archaeological structures in intertidal zones and contribute to the broader understanding of historical shipwrecks.