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Volume 10 Number 2
  • E-ISSN: 1365-2478

Abstract

A

An apparatus is described for the measurement of Young's modulus, , and the energy loss per cycle, Δ of small beam‐shaped rock samples, over the frequency range 2 to 40 c/s. Results are given for seven sedimentary and two igneous types of rock. An increase of between 1 % and 3 % in and of up to 100 % in Δ occurred over this range. Experiments on rocks containing moisture showed a decrease in the magnitude of (at c/s), an increased frequency variation of and a greater and almost linear increase of Δ with frequency. The effect of oil was similar except that the magnitude of at c/s was unaffected. It is suggested that the moisture and oil results are due to viscous movements of fluid through the pores in the rock, and that the changes in and Δ with frequency, in dry rocks, are due to a small viscous mechanism operative at low frequencies.

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2006-04-27
2024-04-19

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  • Article Type: Research Article

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