Resonance Ultrasound Spectroscopy (RUS) uses the normal modes of an oscillating body to determine its elastic parameters. It allows the complete tensor to
be determined from a single measurement.

It fits an experimental gap between low frequency stress-strain measurements and high frequency time of flight experiments and deals with frequencies at the high end of those relevant to geophysical applications. It is a nondestructive method that can be used on small, rare or hard to obtain samples.