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<p>The Messiniakos Gulf, lying within the western Aegean Arc system near the Hellenic trench, exhibits complex morphotectonic structures indicative of pronounced deformation and seismic activity. This dynamic environment is exposed to potential marine geohazards that remain poorly understood. The research aims to understand how recent tectonic activity has influenced seafloor morphology, drainage network pattern, and slope stability. It exploits high-resolution multibeam data by compiling a detailed morphotectonic map to identify and analyze morphotectonic structures across the continental slope and basin. The analysis reveals an asymmetric basin with a relatively uniform western margin that transitions eastward into a steep slope zone (40–50°) along the eastern coast, associated with a major 31&#xa0;km-long W-dipping NW-SE fault zone that defines a deep half-graben structure governing the Gulf’s evolution. For the first time, NE-SW and N-S oriented submarine canyons and gullies have been mapped, with the longest extending 23.84&#xa0;km from the continental shelf. The examination of deformation rates of the continental shelf showed that the northeastern part of the Gulf has been further uplifted by 4–31&#xa0;m since the end of the last glacial maximum. This yields average uplift rates between 0.22 and 1.72&#xa0;mm/ yr, based on changes in the depth and gradient of the shelf break. Additionally, the submarine headscarps and sediment instabilities south of Kalamata Harbor likely represent the triggered mass wasting from the 1986 Mw 5.7 Kalamata earthquake, which developed within unstable sediments along the prolongation of the Western Mani fault zone, reflecting secondary effects of that seismic activity.</p>

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Morphotectonic analysis and associated geohazards: case study of the Messiniakos Gulf, SW Peloponnese, Greece

  • 期刊论文

  • 发表日期：

    2025年10月14日

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  • Effrosyni Varotsou,
  • Paraskevi Nomikou,
  • Dimitrios Papanikolaou,
  • Serafeim Poulos,
  • Ioannis Asteriou,
  • Nikolaos Tsernotopoulos,
  • Yannis Tsaparas,
  • Ilias Koliopanos,
  • Maria Petroulia

摘要

The Messiniakos Gulf, lying within the western Aegean Arc system near the Hellenic trench, exhibits complex morphotectonic structures indicative of pronounced deformation and seismic activity. This dynamic environment is exposed to potential marine geohazards that remain poorly understood. The research aims to understand how recent tectonic activity has influenced seafloor morphology, drainage network pattern, and slope stability. It exploits high-resolution multibeam data by compiling a detailed morphotectonic map to identify and analyze morphotectonic structures across the continental slope and basin. The analysis reveals an asymmetric basin with a relatively uniform western margin that transitions eastward into a steep slope zone (40–50°) along the eastern coast, associated with a major 31 km-long W-dipping NW-SE fault zone that defines a deep half-graben structure governing the Gulf’s evolution. For the first time, NE-SW and N-S oriented submarine canyons and gullies have been mapped, with the longest extending 23.84 km from the continental shelf. The examination of deformation rates of the continental shelf showed that the northeastern part of the Gulf has been further uplifted by 4–31 m since the end of the last glacial maximum. This yields average uplift rates between 0.22 and 1.72 mm/ yr, based on changes in the depth and gradient of the shelf break. Additionally, the submarine headscarps and sediment instabilities south of Kalamata Harbor likely represent the triggered mass wasting from the 1986 Mw 5.7 Kalamata earthquake, which developed within unstable sediments along the prolongation of the Western Mani fault zone, reflecting secondary effects of that seismic activity.