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Relative Sea Level Changes and Morphotectonic Implications Triggered by the Samos Earthquake of 30th October 2020
Open AccessArticle

The Tsunami Caused by the 30 October 2020 Samos (Aegean Sea) Mw7.0 Earthquake: Hydrodynamic Features, Source Properties and Impact Assessment from Post-Event Field Survey and Video Records

1
Department of Geology & Geoenvironment, National & Kapodistrian University of Athens, 15784 Athens, Greece
2
International Society for the Prevention & Mitigation of Natural Hazards, 10681 Athens, Greece
3
Studio Reeldrone, Ippokratus 6, 83100 Vathy, Samos, Greece
*
Author to whom correspondence should be addressed.
J. Mar. Sci. Eng. 2021, 9(1), 68; https://doi.org/10.3390/jmse9010068
Received: 9 December 2020 / Revised: 26 December 2020 / Accepted: 4 January 2021 / Published: 11 January 2021
(This article belongs to the Special Issue Tectonics and Sea-Level Fluctuations)
The tsunami generated by the offshore Samos Island earthquake (Mw = 7.0, 30 October 2020) is the largest in the Aegean Sea since 1956 CE. Our study was based on field surveys, video records, eyewitness accounts and far-field mareograms. Sea recession was the leading motion in most sites implying wave generation from seismic dislocation. At an epicentral distance of ~12 km (site K4, north Samos), sea recession, followed by extreme wave height (h~3.35 m), occurred 2′ and 4′ after the earthquake, respectively. In K4, the main wave moved obliquely to the coast. These features may reflect coupling of the broadside tsunami with landslide generated tsunami at offshore K4. The generation of an on-shelf edge-wave might be an alternative. A few kilometers from K4, a wave height of ~1 m was measured in several sites, except Vathy bay (east, h = 2 m) and Karlovasi port (west, h = 1.80 m) where the wave amplified. In Vathy bay, two inundations arrived with a time difference of ~19′, the second being the strongest. In Karlovasi, one inundation occurred. In both towns and in western Turkey, material damage was caused in sites with h > 1 m. In other islands, h ≤ 1 m was reported. The h > 0.5 m values follow power-law decay away from the source. We calculated a tsunami magnitude of Mt~7.0, a tsunami source area of 1960 km2 and a displacement amplitude of ~1 m in the tsunami source. A co-seismic 15–25 cm coastal uplift of Samos decreased the tsunami run-up. The early warning message perhaps contributed to decrease the tsunami impact. View Full-Text
Keywords: Samos 2020 tsunami; post-tsunami survey; wave run-up; tsunami velocity; tsunami magnitude; tsunami source area; tsunami impact; early warning; tsunami hazard assessment Samos 2020 tsunami; post-tsunami survey; wave run-up; tsunami velocity; tsunami magnitude; tsunami source area; tsunami impact; early warning; tsunami hazard assessment
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MDPI and ACS Style

Triantafyllou, I.; Gogou, M.; Mavroulis, S.; Lekkas, E.; Papadopoulos, G.A.; Thravalos, M. The Tsunami Caused by the 30 October 2020 Samos (Aegean Sea) Mw7.0 Earthquake: Hydrodynamic Features, Source Properties and Impact Assessment from Post-Event Field Survey and Video Records. J. Mar. Sci. Eng. 2021, 9, 68. https://doi.org/10.3390/jmse9010068

AMA Style

Triantafyllou I, Gogou M, Mavroulis S, Lekkas E, Papadopoulos GA, Thravalos M. The Tsunami Caused by the 30 October 2020 Samos (Aegean Sea) Mw7.0 Earthquake: Hydrodynamic Features, Source Properties and Impact Assessment from Post-Event Field Survey and Video Records. Journal of Marine Science and Engineering. 2021; 9(1):68. https://doi.org/10.3390/jmse9010068

Chicago/Turabian Style

Triantafyllou, Ioanna; Gogou, Marilia; Mavroulis, Spyridon; Lekkas, Efthymios; Papadopoulos, Gerassimos A.; Thravalos, Manolis. 2021. "The Tsunami Caused by the 30 October 2020 Samos (Aegean Sea) Mw7.0 Earthquake: Hydrodynamic Features, Source Properties and Impact Assessment from Post-Event Field Survey and Video Records" J. Mar. Sci. Eng. 9, no. 1: 68. https://doi.org/10.3390/jmse9010068

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