The failure of crater scaling from conventional to nuclear explosions is believed to result both from the enormous disparity in energy re- lease (and this also applies between kiloton and megaton nuclear explo- sions) and also from the important difference in energy partition in the two types of explosions. In general it is known that the dimensions of the crater (radius or depth) are affected or determined by the total energy release, the depth! of the charge and the character of the medium (earth) in which the charge is fired. If these parameters operate independently, then one.could write an empirical equation in the form R= f(W) ..f(D,) » f(m) or in the‘form R= f(wW) + £(D,) + f(m) where R is theradius Wis related to energy release,energy density, and detonation velocity =. De is the depth of the charge mis related to the medium. In this case the separate contribution of each of the parameters can be determined easily. If; however, the parameters are interdependent it is necessary to use the form ‘= and the effect of varying any oné.of the parameters is mich more compli- cated because it depends on the values at which the other parameters are maintained. Ne There is general agreement among dnvestigators that the parameters affecting craters are in fact extensivd] interrelated, The universal use of scaling concepts, particularly regard to the scaled depth of charge is evidence in point. Thus, in regardto the effect of energy release and depth of charge a satisfactory form for the equation is R=f(W).f(W, Dd), @ Qo 7: go a or as a more specific example, 1 R2=WE. £(A,) where k is approximately 3. iy pa ‘i “Py The inclusion of an additional term to represent the effect of different mediums could be in ‘several forms, 15