New sedimentary and geomorphic evidence of tsunami flooding related to an older events along the Tangier-Asilah coastal plain, Morocco

Talibi, Hajar El; Moussaoui, Said El; Zaghloul, Mohamed Najib; Aboumaria, Khadija; Wassmer, Patrick; Mercier, Jean

doi:10.1186/s40677-016-0049-6

Cited by 19 publications

(7 citation statements)

References 74 publications

(98 reference statements)

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“…Several attempts to model the effects of these events and to estimate the risk to human life and goods, show that the region is widely exposed if similar events were to recur (Omira et al 2010;Atillah et al 2011;Renou et al 2011;Mellas et al 2012;Moussaoui et al 2017;Ramalho et al 2018). In addition to historical documents, material evidence (geomorphic and sedimentary indices) for tsunamis or high energy events in Morocco have been found in many sites alongside the Moroccan Atlantic coast: (1) in Larache and Rabat (Medina et al 2011), (2) Tahadart estuary (Talibi et al 2016;Khalfaoui et al 2020) and (3) close to the Loukkos river mouth, (Mhammdi and Medina, 2015). According to Soyris (1755), the Lisbon earthquake of 1755, the intensity of which reached VIII-XI on the Mercali scale, produced a large tsunami wave that affected northern Morocco, with El-Jadida city being one of the most impacted (Levret 1991).…”

Section: Tsunamis In Moroccomentioning

confidence: 99%

Quantitative risk assessment in El-Jadida (Northern Atlantic Coast of Morocco) for a tsunami scenario equivalent to that of the 1755 Lisbon earthquake

et al. 2022

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Section: Tsunamis In Moroccomentioning

confidence: 99%

Quantitative risk assessment in El-Jadida (Northern Atlantic Coast of Morocco) for a tsunami scenario equivalent to that of the 1755 Lisbon earthquake

et al. 2022

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“…Although the 1755 tsunami has been studied in detail (El Mrabet 2005;Blanc 2008;Mhammdi et al 2008;Baptista and Miranda 2009;Blanc 2009;Kaabouben et al 2009;Medina et al 2011;El Talibi et al 2016), the very low frequency of such events limits tsunami hazard assessment and countermeasure preparations.…”

Section: Introductionmentioning

confidence: 99%

Tsunami hazard and buildings vulnerability along the Northern Atlantic coast of Morocco –the 1755-like tsunami in Asilah test-site

Moussaoui

Omira

Zaghloul

et al. 2017

Geoenviron Disasters

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Background: The Atlantic Coast of Morocco is prone to tsunami inundation. Therefore, in this region, earthquakeinduced tsunami hazard has been intensively investigated leading to the development of a number of coastal inundation models. However, tsunami vulnerability remains not well understood to the same extent as the hazard. In this study, we use high-resolution numerical modeling, detailed field survey and GIS-based multi-criteria analysis to assess the building tsunami vulnerability and its sensitivity to the tide variations. Asilah located in the northwestern Atlantic coast of Morocco, where the impact from the 1755 tsunami is well documented, constitutes the area of this study. Results:To model the source-to-coast tsunami processes we used the COMCOT (Cornell Multi-grid Coupled Tsunami Model) numerical code on a set of bathymetric/topographic grid layers (640 m, 160 m, 40 m and 10 m resolutions) with an initial sea-surface perturbation generated using Okada's formulae and assuming an instantaneous seabed displacement. The tsunami source models in this study correspond to four 1755-like earthquake scenarios. Results show that Asilah's built environment is highly vulnerable to the tsunami impact that can range from 1.99 to 2.46 km 2 of inundation area, depending on the source and the tidal level considered. The level of building vulnerability decreases considerably when moving away from Asilah's coastline. Moreover, the variation in the tidal level introduces large change in the modeled tsunami impact and, therefore, affects the level of building vulnerability.Conclusion: Thus, we suggest considering the effect of the tide when simulating tsunami hazard and vulnerability, particularly, in coasts where tidal variations are significant. This study provides hazard and vulnerability maps that can be useful to develop the tsunami awareness of the Moroccan coastal population.

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“…1). They are represented in the form of (1) mega-blocks, also known as boulderite deposits, spread over the beaches of Larache (Mhammdi et al 2015), Rabat-Skhirat (Mhammdi et al 2008;Medina et al 2011), Sidi Moussa (Mellas 2012) and Safi (Theilen-Willige et al 2013), (2) or as fine sediment (typically sand size) over the coast of Rabat-Skhiratte and Tahaddart (Chahid et al 2016;El Talibi et al 2016), the lagoons of Oualidia-Sidi Moussa (Leorri et al 2010;Mellas 2012) and the Loukous estuary (Mhammdi et al 2015). Despite these efforts, the majority of these sedimentary deposits lack chronological data, which makes it difficult to know the events responsible for their establishment.…”

Section: Introductionmentioning

confidence: 99%

A late Holocene record of marine high-energy events along the Atlantic coast of Morocco: new evidences from the Tahaddart estuary

Khalfaoui

Dezileau

Degeai

et al. 2020

Geoenviron Disasters

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The Atlantic coast of Morocco has been exposed to marine submersion events from storm surges and tsunamis which have resulted in human and economic losses. The absence of long term records for these hazards makes it difficult to trace their behavior through time, which is the first step to prepare proactive adaptation strategies for events that may happen in the future. In this paper, we present a late Holocene record of marine submersion events along the Atlantic coast of Morocco using a 2.7 m sediment core sampled from the Tahaddart estuary. The sedimentological and geochemical analyses conducted on this geological archive showed a mud-dominated sequence with 14 allochthonous sandy layers (E1-E14) left by marine high-energy events. The deposition age of three layers (E1, E13 and E14) has been determined using conventional dating methods (210Pbex, 137Cs and 14C). The first layer, introduced as E1 seems to fit with the great Lisbon tsunami in 1755 CE (Common Era), an event dated for the first time along the Atlantic coast of Morocco. The other two layers, referred to as E13 and E14, were dated between 3464 and 2837 cal BP (calibrated years Before Present) and chronologically correlated with marine high-energy deposits found on the Spanish Atlantic coast. This correlation confirms the existence of another regional event around 3200 BP.

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New sedimentary and geomorphic evidence of tsunami flooding related to an older events along the Tangier-Asilah coastal plain, Morocco

Cited by 19 publications

References 74 publications

Quantitative risk assessment in El-Jadida (Northern Atlantic Coast of Morocco) for a tsunami scenario equivalent to that of the 1755 Lisbon earthquake

Quantitative risk assessment in El-Jadida (Northern Atlantic Coast of Morocco) for a tsunami scenario equivalent to that of the 1755 Lisbon earthquake

Tsunami hazard and buildings vulnerability along the Northern Atlantic coast of Morocco –the 1755-like tsunami in Asilah test-site

A late Holocene record of marine high-energy events along the Atlantic coast of Morocco: new evidences from the Tahaddart estuary

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