By Kate Hadley (auth.), Max Wyss (eds.)
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300 (J) ..... - 8(J) . ~ u w ..... a:: « ,, In 0 0 -' 6:;£ 200 w «a:: u z 4ffi z u.. u.. oJ 2 3 0 Figure 2 Two fracture experiments in Westerly granite at SOO bars confining pressure and 25°C. Stress and microfracturing rate are plotted against axial strain Vol. 113, 1975) Acoustic Emission During High-Temperature Frictional Sliding 35 rates observed during two typical fracture runs in the present study. The pattern of activity is very similar to that found by Scholz. However, the sensitivity of the apparatus for pulse-height analysis was less than in SCHOLZ'S [3] experiments.
ERROR 00 200 400 TEMPERATURE ( ·c ) 600 Figure 8 Variation of b-value, calculated from the slope of the frequency-amplitude curve, with temperature during frictional sliding of Westerly granite at 2 kbar pressure. Except for the two at room temperature, like symbols indicate measurements made with the same sample. The open symbol denotes b for presliding emissions and the closed symbol denotes b for stable sliding emissions. The two measurements at 25°C are from SCHOLZ [3]. The vertical error bar has been visually estimated from plots such as in Fig.
3] C. H. SCHOLZ, The frequency-magnitude relation of microfracturing in rock and its relation to earthquakes, Bull. Seismol. Soc. Am. 58 (1968),399. [4] J. D. BYERLEE and L. PEsELNlCK, Elastic shocks and earthquakes, Naturwissenschaften 2 (1970), 82. [S] H. L. DUNEGAN and A. T. GREEN, Factors affecting acoustic emission response from materials, Am. Soc. Test. , Spec. Tech. Publ. SOS (1972),100. [6] R. M. STESKY, W. F. BRACE, D. K. -Y. F. ROBIN, Friction in faulted rock at high temperature and pressure, Tectonophysics 23 (1974), 177.