Seismic refraction is a geophysical method used to measure the velocities of seismic waves traveling through the Earth’s subsurface. This method is important in exploration geophysics for mapping subsurface structures, determining the depth of bedrock, and exploring for natural resources.
Reference: Telford, W. M., Geldart, L. P., & Sheriff, R. E. (1990). “Applied Geophysics.” Cambridge University Press.