Accession Number:

AD0648407

Title:

A TECHNIQUE FOR DELINEATING SUBSURFACE FRACTURE ZONES RESULTING FROM HIGH-YIELD DETONATIONS.

Descriptive Note:

Final rept.,

Corporate Author:

ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS

Personal Author(s):

Report Date:

1967-02-01

Pagination or Media Count:

39.0

Abstract:

Site investigations were conducted at two locations, the sites of the DUGOUT and CHARLIE events, at the Nevada Test Site for the purpose of evaluating the dynamic in situ technique as a means of determining the boundaries of craters produced by explosive detonations. Compression- and shear-wave velocities at the location of the DUGOUT event were determined by seismic and vibration tests, respectively. The seismic data analysis was inconclusive because the data were somewhat erratic and, as subsequently determined, geophone spacing and traverse orientation did not provide detailed subsurface coverage of the area of interest. From the vibration data, it was possible to make a cross- sectional contoured plot of shear-wave velocities which showed the extent of subsurface disturbances. Only vibration traverses were run at the CHARLIE site these data were used in mapping the limits of the blast-induced fractures, and in this case actually defined the true crater limits. These results confirmed the feasibility of the dynamic in situ technique as a means of defining the subsurface zonal conditions in the immediate vicinity of craters resulting from high-yield detonations. The study also showed the adaptability of the equipment for this use. Author

Subject Categories:

  • Geology, Geochemistry and Mineralogy
  • Explosions

Distribution Statement:

APPROVED FOR PUBLIC RELEASE