Enregistrements sédimentaires d’événements de haute énergie, exemples de la côte atlantique de Rabat-Skhirat (Maroc)

Chahid, Driss; Lenoble, Arnaud; Boudad, Larbi; Vliët-Lanoé, Brigitte van

doi:10.4000/quaternaire.7543

Cited by 9 publications

(11 citation statements)

References 59 publications

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“…On the Moroccan Atlantic coast, this event (E13/14) could be contemporaneous to marine deposits identified by Mhammdi et al, (2015) on the Loukkos estuary with an estimated mid-Holocene age, and by Chahid et al, (2016) on the Rabat-Skhirat 20 coast with an age between 2700 and 2200 cal BP.…”

Section: Correlation Of Dated Events With Other Historical Archivessupporting

confidence: 70%

“…Conversely, only a few studies have been conducted on the Moroccan Atlantic coast (Chahid et al, 2016;Leorri et al, 2010;5 Mhammdi et al, 2015;El Talibi et al, 2016). In this context, the present work aims to reconstruct past marine submersion events from geological archives (cores) collected in Tahaddart estuary (NW of Morocco) using a high-resolution sedimentological and geochemical analysis.…”

Section: Introductionmentioning

confidence: 99%

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Reconstruction of past marine submersion events (storms and tsunamis) on the North Atlantic coast of Morocco

Khalfaoui¹,

Dezileau²,

Degeai³

et al. 2019

Preprint

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Abstract. The North Atlantic coast of Morocco has been affected historically by marine submersion events resulting from both storms and tsunamis and causing human and economic losses. The development of proactive adaptation strategies requires the study of these events over centennial to millennial timescales. Using a 2.7 m sediment core sampled from the Tahaddart estuary, we have been able to reconstruct past marine submersion events on this coastal area of Morocco over the last 4000 years. The high-resolution sedimentological and geochemical analysis conducted on this core allows us to identify 14 sediment layers attributed to marine high-energy events. The core was dated with isotopic techniques (137Cs, 210Pbex, 14C) and the outcomes reveal that three sediment layers are in connection with two major historical marine submersion events. The first layer mentioned as E1 seems to fit with the great Lisbon tsunami in 1755 CE (Common Era), an event dated for the first time on the Atlantic coast of Morocco. The other two layers referred as E13 and E14 were dated between 3464 and 2837 cal BP and correlated with marine submersion deposits found on Spanish and Moroccan coasts, which confirms the existence of a major high-energy event (around 3200 BP) similar to the one in 1755 CE.

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Section: Correlation Of Dated Events With Other Historical Archivessupporting

confidence: 70%

Section: Introductionmentioning

confidence: 99%

Reconstruction of past marine submersion events (storms and tsunamis) on the North Atlantic coast of Morocco

Khalfaoui¹,

Dezileau²,

Degeai³

et al. 2019

Preprint

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“…This Harhoura section is also characterized by the presence of several clusters of boulders, which reinforces the event-driven aspect of the deposits that form this section. 14 C dating, performed on this section, places these high-energy deposits between 9900 and 2200 cal BP (Chahid et al 2016). The second section is located in Skhirat, north of the mouth of the Cherrat river.…”

Section: Rabat-bouznika Coastmentioning

confidence: 89%

“…Another work carried out by Chahid et al (2016) in the Rabat-Bouznika area revealed the presence of other high-energy deposits (10-16 in Fig. 6c).…”

Section: Rabat-bouznika Coastmentioning

confidence: 90%

Storm surge and tsunami deposits along the Moroccan coasts: state of the art and future perspectives

et al. 2023

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The Moroccan coast is occasionally confronted with marine submersion events caused by storm surges and tsunamis. The Moroccan historical archives recorded some of these events, such as the storm surge of 2014 CE and the tsunami of 1755 CE. The latter remains the most destructive event the country has ever faced, with major human and economic losses recorded mainly between the two cities of Tangier and Safi. The privileged way to prevent any hazard related to these events is to study their past occurrences and consequences. However, historical records are often very scarce to determine their return periods and evaluate their intensities.Accordingly, the scientific community increasingly uses sedimentary archives from coastal environments, since they offer a viable alternative to historical archives. Several studies using this approach have been conducted on the Moroccan coast in recent years; however, until now, there has been no review dealing with these studies, which is the main objective of this paper.The present review shows that most of the Moroccan sites containing marine submersion deposits are located along the Atlantic coast. The Mediterranean coast remain poorly studied despite the presence of tsunami and storm surge risks. The review draws attention also to the absence of chronological data for most of the marine submersion deposits recognized up to now 2 along the Moroccan coasts, which is a major issue that prevents the determination of the return period of these events.

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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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Enregistrements sédimentaires d’événements de haute énergie, exemples de la côte atlantique de Rabat-Skhirat (Maroc)

Cited by 9 publications

References 59 publications

Reconstruction of past marine submersion events (storms and tsunamis) on the North Atlantic coast of Morocco

Reconstruction of past marine submersion events (storms and tsunamis) on the North Atlantic coast of Morocco

Storm surge and tsunami deposits along the Moroccan coasts: state of the art and future perspectives

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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