212 OTHER MAJOR ACTIVITIES The theoretical model of cratering under development involves conceiving the explosion as producing two primaryeffects: one,the transmission of the shock wave in all directions, but with a free surface above the explosion, the shock creates a spall, i.e., a lifting off of the ° Stott ~~ Y Sg ee at « g + < ) a” tte, 8 ghee +a. oe we i fe EO be “- a + yee * * ys te le Oe + Ue =a Se! we a ae ae Oe ero AS, ery: * { ! ! roads. Aerial view of the Danny Boy crater showing radial, fallout collection

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