Elastic and Attenuation Symmetries of Simulated Lunar Rocks.
Icarus November 1970 1970 Nov; 13(3):414-423
Studies were made to determine the elastic and attenuation symmetry of 14 igneous and metamorphic rocks. The rocks were previously chosen by the Bureau of Mines to cover the range of rocks most likely to be representative of rocks on the lunar surface. The studies were made by means of quasilongitudinal pulse velocity and relative amplitude measurements on spherical specimens. The elastic symmetry was successfully determined for all 14 rocks, and the attenuation symmetry for 11 of the rocks. These rocks demonstrated a wide range of characte-istics, for instance the densities ranged from 0.47 to 3.32 G/cm3. It was found that the variations in the elastic and attenuation properties can be closely approximated by the symmetry of the orthorhombic and transversely isotropic systems. The range of velocity anisotropy found is roughly the same as for single crystals. The elastic and attenuation symmetries agree for most of the rocks, within experimental error; a significant difference found in a few rocks suggests a separate major contributing cause (subfabric) of the variations in each of these properties. Rocks in which the elastic anisotropy is notably associated with fracture systems have lower than normal mean velocities.
Icarus, November 1970, V. 13, No. 3, PP. 414-423