This lectures introduces some of the basics related to measuring dynamic soil properties (e.g., modulus, wave propagation velocity, damping) from soils. Several field (i.e., in-situ) and laboratory tests are discussed including seismic reflection, seismic refraction, SASW, MASW, downhole Vs, Uphole Vs, crosshole Vs, cyclic triaxial, cyclic direct simple shear, bender element, resonant column, and torsional shear test.