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Open AccessArticle

Morphotectonic Analysis along the Northern Margin of Samos Island, Related to the Seismic Activity of October 2020, Aegean Sea, Greece

1
Department of Geology and Geoenvironment, National and Kapodistrian University of Athens, Panepistimioupoli Zografou, 15784 Athens, Greece
2
Hellenic Navy Hydrographic Service, Mesogeion 229, TGN 1040 Cholargos, Greece
*
Author to whom correspondence should be addressed.
Academic Editors: Ioannis Kassaras, Athanassios Ganas, Paolo Pace and Jesus Martinez-Frias
Geosciences 2021, 11(2), 102; https://doi.org/10.3390/geosciences11020102
Received: 26 January 2021 / Revised: 13 February 2021 / Accepted: 16 February 2021 / Published: 20 February 2021
(This article belongs to the Special Issue Seismotectonics, Active Deformation, and Structure of the Crust)
On 30 October 2020, a strong earthquake of magnitude 7.0 occurred north of Samos Island at the Eastern Aegean Sea, whose earthquake mechanism corresponds to an E-W normal fault dipping to the north. During the aftershock period in December 2020, a hydrographic survey off the northern coastal margin of Samos Island was conducted onboard R/V NAFTILOS. The result was a detailed bathymetric map with 15 m grid interval and 50 m isobaths and a morphological slope map. The morphotectonic analysis showed the E-W fault zone running along the coastal zone with 30–50° of slope, forming a half-graben structure. Numerous landslides and canyons trending N-S, transversal to the main direction of the Samos coastline, are observed between 600 and 100 m water depth. The ENE-WSW oriented western Samos coastline forms the SE margin of the neighboring deeper Ikaria Basin. A hummocky relief was detected at the eastern margin of Samos Basin probably representing volcanic rocks. The active tectonics characterized by N-S extension is very different from the Neogene tectonics of Samos Island characterized by NE-SW compression. The mainshock and most of the aftershocks of the October 2020 seismic activity occur on the prolongation of the north dipping E-W fault zone at about 12 km depth. View Full-Text
Keywords: swath bathymetry; submarine fault scarp; active fault; submarine canyons; submarine landslides swath bathymetry; submarine fault scarp; active fault; submarine canyons; submarine landslides
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MDPI and ACS Style

Nomikou, P.; Evangelidis, D.; Papanikolaou, D.; Lampridou, D.; Litsas, D.; Tsaparas, Y.; Koliopanos, I. Morphotectonic Analysis along the Northern Margin of Samos Island, Related to the Seismic Activity of October 2020, Aegean Sea, Greece. Geosciences 2021, 11, 102. https://doi.org/10.3390/geosciences11020102

AMA Style

Nomikou P, Evangelidis D, Papanikolaou D, Lampridou D, Litsas D, Tsaparas Y, Koliopanos I. Morphotectonic Analysis along the Northern Margin of Samos Island, Related to the Seismic Activity of October 2020, Aegean Sea, Greece. Geosciences. 2021; 11(2):102. https://doi.org/10.3390/geosciences11020102

Chicago/Turabian Style

Nomikou, Paraskevi; Evangelidis, Dimitris; Papanikolaou, Dimitrios; Lampridou, Danai; Litsas, Dimitris; Tsaparas, Yannis; Koliopanos, Ilias. 2021. "Morphotectonic Analysis along the Northern Margin of Samos Island, Related to the Seismic Activity of October 2020, Aegean Sea, Greece" Geosciences 11, no. 2: 102. https://doi.org/10.3390/geosciences11020102

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