Earthquake-induced liquefaction in the coastal zone, Case of Martil city, Morocco

Hilali, Mohamed El; Timoulali, Youssef; Benyounes, Taj; Ahniche, Mohamed; Bardai, Rabie El; Yattara, Sahel

doi:10.1051/e3sconf/202129801002

Cited by 4 publications

(1 citation statement)

References 7 publications

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“…Such studies have been conducted to investigate the local crustal structure and better understand the geological and tectonic processes that have shaped the region [Gil et al, 2014;Mancilla and Diaz, 2015;Timoulali et al, 2014aTimoulali et al, , 2022. These studies use various geophysical techniques, such as seismic reflection and refraction, seismic/electrical tomography, magnetic surveys, and stations measurements to map the subsurface structure as well as the basins geometry [for Deep Seismic Sounding in the Alboran Sea 1974Sea , 1978Gurrria and Mezcua, 2000;Timoulali et al, 2014;El Fellah et al, 2019;EL Hilali et al, 2021;Taj et al, 2024]. The crust thickness beneath the Betic Cordillera in Southern Spain is estimated to be around 35-38 km.…”

Section: Introductionmentioning

confidence: 99%

Crustal Attenuation Tomographic Image of Northern Morocco: Indication of High Tectonic Activities

Najim,

El Hilali,

Timoulali

et al. 2024

Annals of Geophysics

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Northern Morocco is known by its complex tectonic activity and has been the subject of various geophysical and geodynamic studies aimed to understand the physical properties and composition of the Earth’s crust and upper mantle. The waveforms of earthquakes recorded by the Topo – Iberia – Picasso seismic networks from 2008 to 2012 are analyzed to determine the decay properties of the coda wave and map the attenuation and absorption properties of the crust in this region. The coda quality factor Qc was estimated in five non‑overlapping frequency windows, ranging from 1.5 to 24 Hz, using recordings of local earthquakes. The measurements of Qc were then used to create maps of the absorption quality factor (Qi) using a linearized approximation. These maps were compared with the tectonic settings of the region to gain further insight into the crustal properties. Lateral and vertical variations of the coda quality factor (Qc) were investigated by creating a three‑dimensional tomographic image of the region. The results showed strong lateral variations of absorption in the northern part of Morocco, indicating high tectonic activity. Areas with high tectonic activity and high absorption were characterized by low values of Qc, while areas with low tectonic activity and low absorption had high values of Qc. The areas with thick cover sedimentary materials and shallow geothermal activity showed low‑frequency absorption. When compared to previous studies in northern Morocco, the study provides new information about the three‑dimensional attenuation model of the Earth’s crust.

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Section: Introductionmentioning

confidence: 99%

Crustal Attenuation Tomographic Image of Northern Morocco: Indication of High Tectonic Activities

Najim,

El Hilali,

Timoulali

et al. 2024

Annals of Geophysics

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Seismic site-effects assessment in a fluvial sedimentary environment: case of Oued Martil floodplain, Northern Morocco

et al. 2023

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Multi-parameters approach to assessment of soil liquefaction vulnerability in wetland areas of Lagos, Southwestern, Nigeria

Oladunjoye,

Ishola,

Oyedele

et al. 2024

Discov Appl Sci

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With respect to geology, most coastal terrains are underlain by problematic soils, some of which are liquefiable in nature and may cause sudden failure of engineering infrastructures. Against this background, this study was carried out to investigate the subsurface geology of some Lagos coastal areas and their engineering implications using geophysical and geotechnical methods. To achieve this purpose, the Multichannel Analysis of Surface Waves, Cone Penetration Test, and Standard Penetration Test were deployed. Surface waves measurements were collected using a 24-channel seismograph to which 4.5 Hz twenty-four vertical geophones were connected via the takeouts of the two cable reels. CPT soundings were carried out with a 10-tons motorized cone penetrometer and boring with SPT were carried out as well. The results of the Multichannel Analysis of Surface Waves measurements showed that the shear waves velocity (Vs) ranges from 160 to 470 m/s. The very loose to loose sand delineated have Vs in the range from 170 to 250 m/s. The tip resistance and sleeve resistance values spanned between 4.0 and 72.0 kg/cm2 and 6.0–94 kg/cm2 respectively. The thickness of the liquefiable sands in the study area varied between 2.5 and 18.0 m. At Ikoyi site, owing to the prevalence of loose silty sand, corroborated by the available borehole data and the Liquefaction Potential Index, it is classified as having a high-risk liquefaction and could be responsible for the periodic damages to structural infrastructures such as roads and buildings. The sediments mapped at Okun-Ajah and Badore sites are mainly saturated loose sands with high likelihood to liquefaction with very-high to high risk severity. The study concludes that the presence of these sediments and other factors that could induce ground motion making the study sites potentially susceptible to liquefaction. Hence, an urgent attention must be given to early monitoring measures to address the trend.

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Earthquake-induced liquefaction in the coastal zone, Case of Martil city, Morocco

Cited by 4 publications

References 7 publications

Crustal Attenuation Tomographic Image of Northern Morocco: Indication of High Tectonic Activities

Crustal Attenuation Tomographic Image of Northern Morocco: Indication of High Tectonic Activities

Seismic site-effects assessment in a fluvial sedimentary environment: case of Oued Martil floodplain, Northern Morocco

Multi-parameters approach to assessment of soil liquefaction vulnerability in wetland areas of Lagos, Southwestern, Nigeria

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