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Article Dans Une Revue Natural Hazards and Earth System Sciences Année : 2019

Paleotsunami deposits along the coast of Egypt correlate with historical earthquake records of eastern Mediterranean

Asem Salama
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Mustapha Meghraoui
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Mohamed El Gabry
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Moussa Hesham Hussein
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Ibrahim Korrat
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Résumé

We study the sedimentary record of past tsunamis along the coastal area west of Alexandria (NW Egypt) taking into account the occurrence of major historical earthquakes in the eastern Mediterranean. The two selected sites at Kefr Saber (∼ 32 km west of Marsa-Matrouh city) and ∼ 10 km northwest of El Alamein village are coastal lagoons protected by 2-20 m-high dunes parallel to the shoreline. Field data were collected by (1) coastal geomorphol-ogy along estuaries, wedge-protected and dune-protected lagoons ; and (2) identification and spatial distribution of pale-otsunamis deposits using five trenches (1.5 m-depth) at Kefr Saber and twelve cores (1 to 2.5 m-depth) at El Alamein. Detailed logging of sedimentary sections was conducted using X-rays, grain size and sorting, total organic and inorganic matter, bulk mineralogy, magnetic susceptibility, and radio-carbon dating to identify past tsunamis records. Generally of low energy, the stratigraphic succession made of coastal lagoon and alluvial deposits includes intercalated high-energy deposits made of mixed fine and coarse sand with broken shells, interpreted as catastrophic layers correlated with tsunami deposits. Radiocarbon dating of 46 samples consist in mixed old (>13 000 BP) and young (<5500 BP), dated charcoal and shells in sedimentary units correlate with the 24 June AD 1870 (M w 7.5), 8 August AD 1303 (M w ∼ 8) and 21 July AD 365 (M w 8-8.5) large tsunamigenic earthquakes that caused inundation along the Alexandria and northern Egyptian shoreline. Our results point out the size and recurrence of past tsunamis and the potential for future tsunami hazards on the Egyptian coastline and the eastern Mediter-ranean regions.
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hal-02059520 , version 1 (08-09-2020)

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Asem Salama, Mustapha Meghraoui, Mohamed El Gabry, Said Maouche, Moussa Hesham Hussein, et al.. Paleotsunami deposits along the coast of Egypt correlate with historical earthquake records of eastern Mediterranean. Natural Hazards and Earth System Sciences, 2019, 18 (8), pp.2203-2219. ⟨10.5194/nhess-18-2203-2018⟩. ⟨hal-02059520⟩
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