Scaling Problems of Wave Propagation in Rocks

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Abstract
Propagation of large-amplitude plane waves was studied in rock specimens from 1/2 to 12 inches thick using in-material piezoresistive stress gages. Sioux quartzite, charcoal black granite, and Coconino sandstone were examined. Good records were obtained in the granite experiments, allowing separation of the precursor from the main wave to be observed at five successive locations in a single experiment. It is concluded that time-dependent effects on wave propagation in quartzite and granite are not significant over these distances. Two experiments in granite, with open cracks, one dry and one water- filled, displayed the effect of the crack in erasing the precursor. The erasure was more complete than expected by simple theory, especially in the case of the water-filled crack.

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