Abstract
A series of experiments were carried out to investigate the influence of strain amplitude on wave velocity and attenuation in dry sandstone and smoky quartz. Measurements were performed using the reflection method at a frequency of 1 MHz at strains ∼(0.3–2.0) × 10 −6 under a confining pressure of 20 MPa. The dependence of the compressional velocity on the strain amplitude in sandstone is ambiguous. On one hand, the velocity calculated by means of measurement of the propagation time of the first pulse minimum V min
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