Tsunamigenic potential of a Holocene submarine landslide along the North Anatolian Fault (northern Aegean Sea, off Thasos island): insights from numerical modelling

Tsunamigenic potential of a Holocene submarine landslide along the North Anatolian Fault (northern Aegean Sea, off Thasos island): insights from numerical modelling

<p>The North Anatolian Fault in the northern Aegean Sea triggers frequent earthquakes of magnitudes up to <span class="inline-formula"><i>M</i><sub>w</sub>∼7</span>. This seismicity can be a source of modest tsunamis for the surrounding coastlines...

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Main Authors: A. Janin, M. Rodriguez, D. Sakellariou, V. Lykousis, C. Gorini
Format: Article
Language:English
Published: Copernicus Publications 2019-01-01
Series:Natural Hazards and Earth System Sciences
Online Access:https://www.nat-hazards-earth-syst-sci.net/19/121/2019/nhess-19-121-2019.pdf
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spelling doaj-ef30c0920e8a4bce8c0f5a7ef6c643042020-11-25T01:38:35ZengCopernicus PublicationsNatural Hazards and Earth System Sciences1561-86331684-99812019-01-011912113610.5194/nhess-19-121-2019Tsunamigenic potential of a Holocene submarine landslide along the North Anatolian Fault (northern Aegean Sea, off Thasos island): insights from numerical modelling A. Janin0M. Rodriguez1D. Sakellariou2V. Lykousis3C. Gorini4Laboratoire de Géologie de l'Ecole normale supérieure de Paris, PSL Research University, CNRS UMR 8538, 24 rue Lhomond, 75005 Paris, FranceLaboratoire de Géologie de l'Ecole normale supérieure de Paris, PSL Research University, CNRS UMR 8538, 24 rue Lhomond, 75005 Paris, FranceInstitute of Oceanography, Hellenic Center of Marine Research, 19013 Anavyssos, GreeceInstitute of Oceanography, Hellenic Center of Marine Research, 19013 Anavyssos, GreeceSorbonne Universités, UPMC Université Paris 06, UMR 7193, ISTeP, 75005, Paris, France<p>The North Anatolian Fault in the northern Aegean Sea triggers frequent earthquakes of magnitudes up to <span class="inline-formula"><i>M</i><sub>w</sub>∼7</span>. This seismicity can be a source of modest tsunamis for the surrounding coastlines with less than <span class="inline-formula">50</span>&thinsp;<span class="inline-formula">cm</span> height according to numerical modelling and analysis of tsunami deposits. However, other tsunami sources may be involved, like submarine landslides. We assess the severity of this potential hazard by performing numerical simulations of tsunami generation and propagation from a Holocene landslide (<span class="inline-formula">1.85</span>&thinsp;<span class="inline-formula">km<sup>3</sup></span> in volume) identified off Thasos. We use a model coupling the simulation of the submarine landslide, assimilated to a granular flow, to the propagation of the tsunami wave. The results of these simulations show that a tsunami wave of water height between <span class="inline-formula">1.10</span> and <span class="inline-formula">1.65</span>&thinsp;<span class="inline-formula">m</span> reaches the coastline at Alexandroupoli (58&thinsp;000 inhabitants) 1&thinsp;h after the triggering of the landslide. In the same way, tsunami waves of water height between <span class="inline-formula">0.80</span> and <span class="inline-formula">2.00</span>&thinsp;<span class="inline-formula">m</span> reach the coastline of the Athos peninsula <span class="inline-formula">9</span>&thinsp;<span class="inline-formula">min</span> after the triggering of the landslide. Despite numerous earthquakes of <span class="inline-formula"><i>M</i><sub>w</sub>&gt;7</span> and strong detrital input (on the order of <span class="inline-formula">30</span>&thinsp;<span class="inline-formula">cm ka<sup>−1</sup></span>), only a few Holocene landslides have been recognized so far, asking for tsunami recurrence in this area.</p>https://www.nat-hazards-earth-syst-sci.net/19/121/2019/nhess-19-121-2019.pdf
collection DOAJ
language English
format Article
sources DOAJ
author A. Janin
M. Rodriguez
D. Sakellariou
V. Lykousis
C. Gorini
spellingShingle A. Janin
M. Rodriguez
D. Sakellariou
V. Lykousis
C. Gorini
Tsunamigenic potential of a Holocene submarine landslide along the North Anatolian Fault (northern Aegean Sea, off Thasos island): insights from numerical modelling
Natural Hazards and Earth System Sciences
author_facet A. Janin
M. Rodriguez
D. Sakellariou
V. Lykousis
C. Gorini
author_sort A. Janin
title Tsunamigenic potential of a Holocene submarine landslide along the North Anatolian Fault (northern Aegean Sea, off Thasos island): insights from numerical modelling
title_short Tsunamigenic potential of a Holocene submarine landslide along the North Anatolian Fault (northern Aegean Sea, off Thasos island): insights from numerical modelling
title_full Tsunamigenic potential of a Holocene submarine landslide along the North Anatolian Fault (northern Aegean Sea, off Thasos island): insights from numerical modelling
title_fullStr Tsunamigenic potential of a Holocene submarine landslide along the North Anatolian Fault (northern Aegean Sea, off Thasos island): insights from numerical modelling
title_full_unstemmed Tsunamigenic potential of a Holocene submarine landslide along the North Anatolian Fault (northern Aegean Sea, off Thasos island): insights from numerical modelling
title_sort tsunamigenic potential of a holocene submarine landslide along the north anatolian fault (northern aegean sea, off thasos island): insights from numerical modelling
publisher Copernicus Publications
series Natural Hazards and Earth System Sciences
issn 1561-8633
1684-9981
publishDate 2019-01-01
description <p>The North Anatolian Fault in the northern Aegean Sea triggers frequent earthquakes of magnitudes up to <span class="inline-formula"><i>M</i><sub>w</sub>∼7</span>. This seismicity can be a source of modest tsunamis for the surrounding coastlines with less than <span class="inline-formula">50</span>&thinsp;<span class="inline-formula">cm</span> height according to numerical modelling and analysis of tsunami deposits. However, other tsunami sources may be involved, like submarine landslides. We assess the severity of this potential hazard by performing numerical simulations of tsunami generation and propagation from a Holocene landslide (<span class="inline-formula">1.85</span>&thinsp;<span class="inline-formula">km<sup>3</sup></span> in volume) identified off Thasos. We use a model coupling the simulation of the submarine landslide, assimilated to a granular flow, to the propagation of the tsunami wave. The results of these simulations show that a tsunami wave of water height between <span class="inline-formula">1.10</span> and <span class="inline-formula">1.65</span>&thinsp;<span class="inline-formula">m</span> reaches the coastline at Alexandroupoli (58&thinsp;000 inhabitants) 1&thinsp;h after the triggering of the landslide. In the same way, tsunami waves of water height between <span class="inline-formula">0.80</span> and <span class="inline-formula">2.00</span>&thinsp;<span class="inline-formula">m</span> reach the coastline of the Athos peninsula <span class="inline-formula">9</span>&thinsp;<span class="inline-formula">min</span> after the triggering of the landslide. Despite numerous earthquakes of <span class="inline-formula"><i>M</i><sub>w</sub>&gt;7</span> and strong detrital input (on the order of <span class="inline-formula">30</span>&thinsp;<span class="inline-formula">cm ka<sup>−1</sup></span>), only a few Holocene landslides have been recognized so far, asking for tsunami recurrence in this area.</p>
url https://www.nat-hazards-earth-syst-sci.net/19/121/2019/nhess-19-121-2019.pdf
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