Abstract
The South East Aegean Sea is seismically active with crustal and intermediate-depth earthquakes of magnitude that can exceed the magnitude Mw = 7. On July 20, 2017, a shallow normal faulting Mw = 6.6 earthquake occurred in the Gulf of Gökova, 10 km away from the cities of Kos and Bodrum. A tsunami hit the coasts of Turkey and Kos Island with waves of up to 2 m that damaged several harbors. Based on the field surveys and the tide-gauge records of Bodrum, Syros and Kos harbors, we performed tsunami simulations to constrain the source and analyze the North v/s South-dipping solutions for the fault plane. Depending on the source model, the simulations show different height distributions which provide complementary constrains on the source parameters, helping the characterization of the fault plane. The comparison between our maximum wave heights models and the field data favor the North-dipping fault scenario. When using only the constraint of the Bodrum tide-gauge, our models lead to a source with a 0.7 m fault slip, incompatible with the slip inferred from geodesy. When using the constrain from neighboring coastal wave heights and run-up recovered during field surveys, the best fit is obtained with a 2 m fault slip scenario consistent with the geodetic models. There is a 0.25 m mean difference between observed and synthetic water heights that could be due to the unaccuracy of the bathymetry data.
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Availability of Data and Material
The work is based on the analysis of data published in previous papers.
Code Availability
The code Taitoko used to make the tsunami models belongs to CEA DAM and is not available publicly.
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Acknowledgements
We thank Sotiris Valkaniotis for his assistance with Kos harbor bathymetry and two anonymous reviewers for their remarks and advices.
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LC was supported financially by the Laboratoire de Recherche Conventionné (LRC) Yves-Rocard joint laboratory between the Commissariat à l'énergie atomique (CEA) and École normale supérieure (ENS).
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All authors contributed to the study. LC, AG, PH initiated the work, gathered the data relative to the tsunami and made the tsunami models. PB and AG contributed for the geological aspects, the fault models, and the discussion. The first draft was written by LC with the contribution of all authors. The drafting of this revised draft was coordinated by PB. All authors read and approved this version of the manuscript.
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Cordrie, L., Gailler, A., Heinrich, P. et al. The July 20, 2017 Mw = 6.6 Bodrum-Kos Earthquake, Southeast Aegean Sea: Contribution of the Tsunami Modeling to the Assessment of the Fault Parameters. Pure Appl. Geophys. 178, 4865–4889 (2021). https://doi.org/10.1007/s00024-021-02766-3
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DOI: https://doi.org/10.1007/s00024-021-02766-3