ABSTRACT
One of the main tasks in surface wave testing is to extract information about the geometric dispersion of surface waves from observations of the particle motion at two or more receiver locations. The information is usually presented in the form of dispersion curves that show the variation of surface wave phase or group velocity versus frequency or wavelength. In this chapter, we describe the most widely used methods for calculating phase velocity dispersion curves. In fact, group velocities are rarely used for near-surface applications.
