Fluid impact craters and hypervelocity - high velocity impact experiments in metals and rocks

The impact phenomena of hypervelocity and high-velocity projectiles with rock and metal targets are being studied in a cooperative research program conducted by the U.S. Geological Survey and the Ames Research Center of the National Aeronautics and Space Administration. This paper deals with the comparison of: (1) fluid-impact craters produced by water drops impacting water, (2) hypervelocity and high-velocity impact craters produced by impact of steel, aluminum, and polyethylene projectiles with basalt, and (3) hypervelocity and high-velocity impact craters in metals.