Accession Number : AD0879419

Title :   Crater and Ejecta Study.

Descriptive Note : Final rept.,

Corporate Author : DEFENCE RESEARCH ESTABLISHMENT SUFFIELD RALSTON (ALBERTA)

Personal Author(s) : Jones, G. H. S. ; Diehl, C. H. H. ; Pinnell, J. H. ; Briosi, G. K.

Report Date : 10 DEC 1970

Pagination or Media Count : 278

Abstract : The report gives the full details of the experimental procedures used and the data obtained during the study of the crater produced by the detonation of 500 tons of TNT in a spherical configuration tangential to the surface of undisturbed lacustrine sands and silts. The overall programme associated with this detonation has been nicknamed PRAIRIE FLAT. It is shown that all the data obtained from a variety of nominally independent projects are internally consistent, and also exhibit a marked consistency with data obtained in earlier trials. It is shown that the ejecta blanket consists of a coherently overturned flap of the upper few feet of sediment, combined with thrust blocks on the inside of the hinge region of this flap. In addition, it is shown that there is a general tendency towards downwarping of the strata under the rim, despite occasional local upthrusts. The crater exhibits a symmetrical pattern of ring folding, and circumferential cracks both inside and outside the main crater. The central regions of the crater have not been excavated, due to the continued presence of water and wet sedimentary deposits brought in by the water. Comments are made upon long range fallout of tagged particles and on the relatively close range fallout of spheroids composed of fused sands and silts. (Author)

Descriptors :   (*EXPLOSION EFFECTS, MEASUREMENT), (*NUCLEAR EXPLOSIONS, SIMULATION), CRATERING, BLAST, TNT, SAND, SILT, TERRAIN, MOTION, STRATIGRAPHY, DEFORMATION, TABLES(DATA), CANADA.

Subject Categories : Explosions

Distribution Statement : APPROVED FOR PUBLIC RELEASE