The seismic refraction technique was
used to characterise the topsoil of Nine Local Government Areas in Akwa Ibom
State. The survey area lies between latitudes 4o 45’ and 5o
15’ N and between longitudes 7o.45’ and 8o 30’ E. The
study area covered an area of about 1110.1km2. The study area lies
within the tertiary units of the continental plain sands built on the silicic
deposit of hard energy arcuate Niger Delta. Shootings covered 27 forward and 27
reverse P-wave shootings carried out using 12- channel seismograph. P-wave velocities were obtained from seismic
refraction survey covering a spread line of 50 m, with 2 m
geophones spacing in the
topsoil of the study area. Due to the unavailability of S-wave geophones, the
S-wave velocities were estimated using modified Castagna equation characterised
with constants a = 0.4563 and b = -1.2. The study area covered Ibiono Ibom,
Itu, Uyo, Uruan, Ibesikpo, Etinan, Nsit Ubium, Nsit Ibom and Nsit Atai Local
Government Areas of Akwa Ibom State, Southern Nigeria. The
arrival times of recorded signal (seismograms) were picked and plotted against
the offset distance using IX Refrax and Pickwin software. This software generated T-X graphs and the seismic models,
which generally showed the two velocity layers serving as foundation in the
study area from the generated forward and reverse seismic refraction shootings.
Result show that the
The area under consideration was found to be gently dipped as the dip angles were greater than 5o in some locations. This variation in the depth of topsoil formation is responsible for the variations noticed in the depths of formations measured in different positions. From the above averages and ranges of geoelastic parameters, it can be summarily inferred that there is no much disparity in the geologic facies and hence in the presence of adequate compaction and compression, durable and sustainable engineering structures can be constructed.
ESSIEN, E (2022). Assessment Of Elastic Parameters On Near Surface Earth Using Seismic Refraction In Uyo, Southern Nigeria. Repository.mouau.edu.ng: Retrieved Dec 02, 2023, from https://repository.mouau.edu.ng/work/view/assessment-of-elastic-parameters-on-near-surface-earth-using-seismic-refraction-in-uyo-southern-nigeria-7-2
ESSIEN, ESSIEN. "Assessment Of Elastic Parameters On Near Surface Earth Using Seismic Refraction In Uyo, Southern Nigeria" Repository.mouau.edu.ng. Repository.mouau.edu.ng, 26 Oct. 2022, https://repository.mouau.edu.ng/work/view/assessment-of-elastic-parameters-on-near-surface-earth-using-seismic-refraction-in-uyo-southern-nigeria-7-2. Accessed 02 Dec. 2023.
ESSIEN, ESSIEN. "Assessment Of Elastic Parameters On Near Surface Earth Using Seismic Refraction In Uyo, Southern Nigeria". Repository.mouau.edu.ng, Repository.mouau.edu.ng, 26 Oct. 2022. Web. 02 Dec. 2023. < https://repository.mouau.edu.ng/work/view/assessment-of-elastic-parameters-on-near-surface-earth-using-seismic-refraction-in-uyo-southern-nigeria-7-2 >.
ESSIEN, ESSIEN. "Assessment Of Elastic Parameters On Near Surface Earth Using Seismic Refraction In Uyo, Southern Nigeria" Repository.mouau.edu.ng (2022). Accessed 02 Dec. 2023. https://repository.mouau.edu.ng/work/view/assessment-of-elastic-parameters-on-near-surface-earth-using-seismic-refraction-in-uyo-southern-nigeria-7-2