Distribution and origin of submarine landslides in the active margin of the southern Alboran Sea (Western Mediterranean Sea)

d’Acremont, Elia; Lafuerza, Sara; Rabaute, Alain; Lafosse, Manfred; Castelot, M. Jollivet; Gorini, Christian; Alonso, Belén; Ercilla, Gemma; Vázquez, J.T.; Vandorpe, Thomas; Juan, Carmen; Migeon, Sébastien; Ceramicola, Silvia; López-González, N.; Rodriguez, Mathieu; Moumni, Bouchta El; Benmarha, Oumnia; Ammar, Abdellah

doi:10.1016/j.margeo.2022.106739

Cited by 11 publications

(8 citation statements)

References 95 publications

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“…Contourite deposits could constitute weak sediment layers more sensitive to disruptions (Juan et al, 2016). In addition, the high sedimentation rate observed in the region corroborates with fluid escapes processes such as pore pressure phenomena which condition the initial stability of slopes (d'Acremont et al, 2022;Alonso et al, 2021).…”

Section: Study Areasupporting

confidence: 54%

Evaluation of Tsunami Inundation in the Plain of Martil (North Morocco): Comparison of Four Inundation Estimation Methods

Basquin

Baz

Sainte-Marie

et al. 2023

Preprint

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Section: Study Areasupporting

confidence: 54%

Evaluation of Tsunami Inundation in the Plain of Martil (North Morocco): Comparison of Four Inundation Estimation Methods

Basquin

Baz

Sainte-Marie

et al. 2023

Preprint

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“…Such intensities imply acceleration larger than 0.3 g from the B3 law (Beauducel et al., 2011). This is larger than the measured or estimated peak‐ground acceleration (PGA) thresholds for triggering a slope failure in subaqueous environments (0.1–0.2 g, d’Acremont et al., 2022; Dan et al., 2009; Noda et al., 2008), although Mountjoy et al. (2018) estimated a PGA threshold of ∼0.38–0.44 g for canyon rim failure during the Kaikoura earthquake from direct observations made right after the earthquake.…”

Section: Discussionmentioning

confidence: 80%

Sedimentary Records in the Lesser Antilles Fore‐Arc Basins Provide Evidence of Large Late Quaternary Megathrust Earthquakes

Seibert,

Feuillet,

Ratzov

et al. 2024

Geochem Geophys Geosyst

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The seismic potential of the Lesser Antilles subduction zone is poorly known and highly debated. Only two damaging earthquakes have been reported in the historical period, in 1839 and 1843, but their sources and magnitude are still uncertain. Global Navigation Satellite Systems and coral data contradict each other, and no conclusion has been reached on the coupling ratio of the plate interface. Given the threat posed by the possible occurrence of a large megathrust earthquake, it is crucial to gain information on prehistorical events. We present the results of a submarine paleoseismological study that covers an exceptional ∼120 Kyr‐long period. We studied the sediments sampled in six up to 26 m‐long piston cores collected in deep fore‐arc basins located over the epicentral region of the 1843 earthquake. Using a multiproxy approach combining geophysical, geochemical, and sedimentological analysis, biostratigraphy and radiocarbon dating, we identified, characterized, and dated numerous event deposits that we then correlated with the sampled basins over an up to 160 km‐long area. We show that at least 33 earthquakes likely triggered these sediment remobilizations in the last 120 Kyr. Four of these events promoted exceptional deposits of turbidites + homogenites. From peak ground acceleration calculated for potential earthquakes occurring on various faults, and the absence of deposits linked to the historical earthquakes, we propose that the sources are likely megathrust earthquakes. Over the last 60 Kyr, we inferred at least three 15–25 Kyr‐long seismic cycles in which the recurrence times of earthquakes shortens from ∼5 to ∼2 Kyr.

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“…Recent studies have reported tectono–sedimentary interactions on low‐latitude and mid‐latitude active margins, such as the circum‐Pacific (Ratzov et al ., 2012; Harris et al ., 2014; Nishida et al ., 2022), offshore New Zealand (McArthur & McCaffrey, 2019; Bailey et al ., 2020) and the Mediterranean Sea (Soulet et al ., 2016; d'Acremont et al ., 2022). However, examples of high‐latitude active margins are rare.…”

Section: Introductionmentioning

confidence: 99%

“…On active continental margins, however, faulting, tectonic uplift, tilting movements and earthquakes influence the initiation and termination of deep‐water processes (Lo Iacono et al ., 2014; Mountjoy et al ., 2018; Nishida et al ., 2022). Tectonic‐related slope morphology also constrains the scale and distribution of sedimentary systems (Lo Iacono et al ., 2014; Gamberi et al ., 2015; Bailey et al ., 2020; d'Acremont et al ., 2022). The interactions between tectonics and deep‐water processes commonly occur through geological timescales (Gawthorpe & Leeder, 2000; Gamberi et al ., 2015; Bailey et al ., 2020), although their impacts on the evolution of active margins remain unclear (Hernández‐Molina et al ., 2016; Nugraha et al ., 2019; Pérez et al ., 2019).…”

Section: Introductionmentioning

confidence: 99%

Deep‐water sedimentary systems and tectono–sedimentary interactions on the oblique convergent margin in Antarctica

et al. 2023

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Active continental margins are tectonic sites with complex sedimentary processes. Tectono-sedimentary interactions occur over geological time and determine the modern morphology of the margin. However, such interactions have been poorly documented in high-latitude regions. This study focuses on deep-water sedimentary systems on the South Shetland convergent margin, which is the only remaining active continental margin in Antarctica. Numerous gullies, 20 canyons and three contourite drifts are identified by interpreting bathymetry, oceanography and reflection seismic data. Heavy mineral contents of a gravity core, located at a downslope elongated mounded drift, show the asynchronous interplay of downslope and alongslope processes. The rest of the margin is dominated by turbidity currents. Variations in the slope gradient control thalweg profiles and sinuosity of canyons. Tectonic-related morphology restricts the distribution of contourite drifts. Earthquakes triggered by underplating and tectonic compression may induce slope instability at the lower flank of the plastered drift. Tectonic uplift influences the amount of sediments transported by ice sheets and controls the shelf stacking pattern. The mixed turbidite-contourite system transitions to separated canyon and drift systems from passive to active continental margins under the influence of the tectonic-related morphology. A systematic comparison has been made among several convergent margins with similar tectonic settings. Results suggest that submarine canyons on these shelf-slope systems have similar morphological features and are comparable in size. Coarse sediment input and steep continental slopes (mean slope 7 to 10°) control the canyon morphology on these margins. Therefore, this research has important implications for furthering the current understanding of sedimentary systems on high-latitude convergent margins and tectono-sedimentary interactions.

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Distribution and origin of submarine landslides in the active margin of the southern Alboran Sea (Western Mediterranean Sea)

Cited by 11 publications

References 95 publications

Evaluation of Tsunami Inundation in the Plain of Martil (North Morocco): Comparison of Four Inundation Estimation Methods

Evaluation of Tsunami Inundation in the Plain of Martil (North Morocco): Comparison of Four Inundation Estimation Methods

Sedimentary Records in the Lesser Antilles Fore‐Arc Basins Provide Evidence of Large Late Quaternary Megathrust Earthquakes

Deep‐water sedimentary systems and tectono–sedimentary interactions on the oblique convergent margin in Antarctica

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