Strain gage instrumentation is reported of three Cowboy shots to measure the strain produced in salt by coupled and decoupled detonations. Linear array tests were made to develop a propagation law for strain, to determine particle velocity and acceleration in salt, to compare explosives, to determine the effect of impedance coupling between explosive and rock, and to investigate other seismic effects. Crater tests were made to determine the dynamic tensile breaking strength of salt. Tests were made to measure in situ, longitudinal (P) and shear (S) wave velocities and to calculate the dynamic elastic constants therefrom. Laboratory tests on core were made to determine the dynamic compressive and tensile breaking strength of salt. Physical properties tests were made under laboratory conditions for comparison with dynamic results. (W.L.H.)