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Estimating tsunami hazards between Lefkada and Preveza 13

Sedimentary evidence of tsunamigenic flooding was found for the entire coastal zone between the cities of Lefkada and Preveza, locally testifying to multiple tsunami landfall during the Holocene (May et al. 2007, Vött et al. 2009a). Geomorphological and geoarchaeological traces document the more or less complete inundation of Actio Headland directly opposite to city of Preveza (Vött et al. 2007). These results also imply tsunami-borne damages to modern Preveza and distal areas of the nearby Louros River delta. Geo-scientific studies to the immediate NNE of the city revealed at least one major tsunami impact during the past millennia. Compared to geo-scientific field data, our modeling results strongly corroborate the tsunami hazard for the Preveza-Lefkada coastal zone concerning both flow direction and spatial dimensions of extreme wave events (Floth et al. 2009).

5 Conclusion Our modeling results clearly show that all locations in the study area are well secure from minor tsunami-events. This is explained by their sheltered position behind spits and beach ridges (Aghios Nikolaos, Lefkada City) or on the lee-side of a peninsula (Preveza) and by their sheer elevation (Plaghia villages) or distance from the sea (Airport facilities). In case of major events, however, almost all inhabitated sites are endangered of peripheral to an entire flooding.

References Floth, U. (2008): The tsunami hazard between Lefkada and Preveza, based on computer modelling as well as

field and laboratory evidence. Unpublished diploma thesis, Faculty of Geography, Philipps-Universität Marburg.

Floth, U., A. Vött, S.M. May, H. Brückner & S. Brockmüller (2009): Geo-scientific evidence versus computer models of tsunami landfall in the Lefkada coastal zone (NW Greece). In: Marburger Geographische Schriften 145:. 140–156.

May, S.M., A. Vött, H. Brückner & S. Brockmüller (2007): Evidence of tsunamigenic impact on Actio headland near Preveza, NW Greece. In: Coastline Reports 9: 115–125.

Nielsen, O. (2007): ANUGA v1.0 User Manual. Soloviev, S.L., O.N. Solovieva, C. Go, K. Kim & A. Shchetnikov (2000): Tsunamis in the Mediterranean Sea

2000 BC – 2000 AD. Kluwer Academic Publishers. Dordrecht. Vött, A., H. Brückner, M. Handl & A. Schriever (2006a): Holocene palaeogeographies and the

geoarchaeological setting of the Mytikas coastal plain (Akarnania, NW Greece). In: Zeitschrift für Geomorphologie N.F. 142: 85–108.

Vött, A., H. Brückner, S.M. May, F. Lang & S. Brockmüller (2007): Late Holocene tsunami imprint on Actio headland at the entrance of the Ambrakian Gulf. In: Méditerranée, revue géographique des pays méditerranées 108: 43–57.

Vött, A., H. Brückner, M. May, F. Lang & S. Brockmüller (2008): Strong tsunami impact on the Bay of Aghios Nikolaos and its environs (NW Greece) during Classical-Hellenistic times. In: Quaternary International. Amsterdam 181: 105–122.

Vött, A., H. Brückner, S. Brockmüller, M. Handl, S.M. May, K. Gaki-Papanastassiou, R. Herd, F. Lang, H. Maroukian, O. Nelle & D. Papanastassiou (2009a): Traces of Holocene tsunamis across the Sound of Lefkada, NW Greece. In: Global and Planetary Change 66: 112–128.

Vött, A., H. Brückner, S.M. May, D. Sakellariou, O. Nelle, F. Lang, V. Kapsimalis, S. Jahns, R. Herd, M. Handl & I. Fountoulis (2009b): The Lake Voulkaria (Akarnania, NW Greece) palaeoenvironmental archive – a sediment trap for multiple tsunami impact since the mid-Holocene. In: Zeitschrift für Geomorphologie N.F., 53 (1): 1-37 (in press).

14 Floth et al.

Acknowledgement We express our thanks to Dr. C. Reudenbach (Philipps-Universität Marburg), the Greek Institute of Geology and Mineral Exploration (Athens), and the developers of the Anuga software for various support. Financial support by the German Research Foundation (Bonn, Az. VO 938/2-1) is gratefully acknowledged.

Addresses Dipl.-Geogr. Ulrich Floth University of Rostock - Institute for Environmental Engineering, Coastal Engineering Justus-von-Liebig-Weg 6 18059 Rostock, Germany

ulrich.floth@uni-rostock.de