1. Lecturer, Dept. of Civil Engineering, Univ. of Uyo, Uyo. Akwa Ibom State, P.O. Box 1442. Calabar Road Box Office, Calabar, Cross River State, Nigeria (corresponding author).
2. Professor of Geophysics, Dept. of Physics (Geophysics Unit), Univ. of Calabar, Calabar, Nigeria.
3. Associate Professor of Geophysics, Dept. of Physics (Geophysics Unit), Univ. of Calabar, Calabar, Nigeria.