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Natural Hazards and Earth System Sciences An interactive open-access journal of the European Geosciences Union
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Volume 18, issue 7 | Copyright
Nat. Hazards Earth Syst. Sci., 18, 1985-1998, 2018
https://doi.org/10.5194/nhess-18-1985-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 17 Jul 2018

Research article | 17 Jul 2018

Tsunamis boulders on the rocky shores of Minorca (Balearic Islands)

Francesc Xavier Roig-Munar1, Joan Manuel Vilaplana2, Antoni Rodríguez-Perea3, José Ángel Martín-Prieto1, and Bernadí Gelabert4 Francesc Xavier Roig-Munar et al.
  • 1QU4TRE, environmental consulting, Carritxaret 18.6, es Migjorn Gran, 07749 Minorca, Spain
  • 2Department of Earth and Ocean Dynamics, RISKNAT Group, Geomodels, Universitat de Barcelona, Martí i Franquès, s/n 08028 Barcelona
  • 3Department of Geography, Universitat de les Illes Balears, Carretera de Valldemossa, km 7.5, 07122, Palma, Majorca, Spain
  • 4Department of Biology, Universitat de les Illes Balears, Carretera de Valldemossa, km 7.5, 07122, Palma, Majorca, Spain

Abstract. Large boulders have been found on marine cliffs of 24 study areas on Minorca, in the Balearic archipelago. These large imbricated boulders of up to 229t are located on platforms that comprise the rocky coastline of Minorca, several tens of meters from the edge of the cliff, up to 15m above the sea level and kilometers away from any inland escarpment. They are mostly located on the south-eastern coast of the island, and numerical models have identified this coastline as a zone with a high probability of tsunami impact. The age of the boulders of the studied localities range between 1574AD and recent times, although most of them are concentrated around the year 1790AD. Although some storm waves might play a role in their dislodging, the distribution of the boulder sites along the Balearic Islands, the degree and direction of imbrication and the run-up necessary for their placement suggest transport from northern African tsunami waves that hit the coastline of Minorca.

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Large boulders have been found on platforms that comprise the rocky coastline of Minorca (Balearic Islands), several tens of meters from the edge of the cliff, up to 15 m above the sea level, and kilometers away from any inland escarpment. The age of the boulders, the direction of imbrication and the estimation of run-up necessary for their placement indicate dislodging and transport by northern Africa tsunami waves that hit the coastline of Minorca.
Large boulders have been found on platforms that comprise the rocky coastline of Minorca...
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