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Seismic site characterization baseline data for microzonation and site response analysis of Otuasega Town, Bayelsa State, Niger Delta region of Nigeria.
Abdullah, Gamil M S; Kennedy, Charles; Kumar, Ashok; Salilew, Waleligne Molla; Benjeddou, Omrane.
Afiliación
  • Abdullah GMS; Department of Civil Engineering, College of Engineering, Najran University, Najran, Saudi Arabia. gmabdullah@nu.edu.sa.
  • Kennedy C; Science and Engineering Research Center, Najran University, Najran, Saudi Arabia. gmabdullah@nu.edu.sa.
  • Kumar A; Department of Civil Engineering, School of Engineering, Kenule Beeson Saro-Wiwa Polytechnic, P.M.B. 20, Bori, 520001, Rivers State, Nigeria.
  • Salilew WM; Department of Civil, Environment and Transportation Systems, College of Engineering and Technology, University of Sargodha, Sargodha, 40162, Pakistan.
  • Benjeddou O; Mechanical Engineering Department, Addis Ababa Science and Technology University, 16417, Addis Ababa, Ethiopia. waleligne.molla@aastu.edu.et.
Sci Rep ; 14(1): 20554, 2024 Sep 04.
Article en En | MEDLINE | ID: mdl-39232039
ABSTRACT
This study presents the findings of a comprehensive geotechnical and seismic site investigation conducted at Otuasega Town located in Bayelsa State within the Niger Delta region of Nigeria. Subsurface exploration involved advancing 10 boreholes to 30 m depth using hollow stem auger drilling. Continuous disturbed and undisturbed soil sampling was performed at 1.5 m intervals for detailed geotechnical testing. Laboratory tests on the recovered soil samples established the index properties, classification, densities and consistency limits of the stratified deposits. The subsurface profile comprised alternating layers of clay, silt and sand typical of deltaic sediments, with the clay fractions exhibiting medium to high plasticity. Shear wave velocity (Vs) profiling using Multichannel Analysis of Surface Waves (WASW) techniques categorised the site predominantly as Site Class C and D based on international standards. The Standard Penetration Test (SPT) N-values ranged from 5 to 10, indicating soft normally consolidated clay conditions typical of the Niger Delta region. Predictive empirical models developed from the field and lab data showed strong correlations for estimating key geotechnical parameters such as SPT blow count, Vs and liquefaction resistance. Ground response analyses using the Vs and SPT data indicated significant site amplification potential, with peak ground accelerations up to 1.5 times the bedrock motion. Liquefaction analysis based on the empirical SPT-based methods revealed a high potential for liquefaction in the sandy layers, especially under strong earthquake shaking. The study characterized the complex sedimentology and provided baseline information for seismic microzonation and site-specific ground response analyses to advance understanding of geohazards in this delta environment.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Sci Rep Año: 2024 Tipo del documento: Article País de afiliación: Arabia Saudita Pais de publicación: Reino Unido
Texto completo
Añadir a Mi BVS
Imprimir
XML
PubMed Links
Buscar en Google

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Sci Rep Año: 2024 Tipo del documento: Article País de afiliación: Arabia Saudita Pais de publicación: Reino Unido