By A. Roberts

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BASS, R. C , and HAWK, H . L . , 1965. 42. , Measurements and calculations of peak shock waves parameters from underground nuclear detonations, J. Geophys. Res. 7 0 (4) (1965). 43. BUTKOVICH, T. , Calculation of the shock wave from an underground nuclear explosion in granite, in Peaceful Applications of Nuclear Explosives, Plowshare, 1965. 44. COOK, Μ. , The Science of High Explosives, Reinhold, New York, 1958. 45. DUVALL, W. I. , Spherical Propagation of Explosion-generated Strain Pulses in Rock, U S Bur.

And HIGGS, D . , Experimental Deformation of St. Peter Sand, Geol. Soc. Am. Memo 79, ch. VI, pp. 133-91, 1960. 9. BOYD, F . R . , and ENGLAND, J. L . , The quartz-coesite transition, J. Geophys. Res. 6 5 , 7 4 9 - 5 6 (1960). 10. FRYER, C . C , Shock deformation of quartz sand, Int. J. Rock Mech. Min. Sei. 3 , 8 1 - 8 8 (1966). 11. BROBERG, Κ . B . , Some aspects of the mechanism of scabbing, Int. Symp. on Stress Wave Propagation in Materials, Penn. , 1960, pp. 2 3 1 - 8 , Interscience, New York.

The utilization of explosive energy in relation to the fracture process will be very dependent upon the characteristics of energy absorption and the attenuation characteristics of the medium concerned. Strength of Explosives The term "strength" as applied to an explosive has, by convention, been applied by explosives manufacturers to describe various grades of explosives. It is not always indicative of the energy that is available for blasting. Two empirical tests, used to classify explosives on a comparative basis, are the ballistic mortar test and the Trauzl lead-block test.

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