Project Cowboy : Final Report : Seismic Decoupling for Explosions in Spherical Cavities

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Description

A series paired explosions in a salt mine near Winnfield, Louisiana, has been conducted to test a theory by A.L. Latter concerning seismic decoupling by underground cavities. The theory predicted a decoupling of 132 Free-field and surface measurements from an explosion in either a 6-ft- or a 15-ft-radius spherical cavity were compared with similar measurements from a completely tamped explosion of equal size. Shot sizes were from 20 pounds up to a ton. Surface measurements were made out to 100 km and covered the frequency range from 0.05 to 100 cps. The experiments confirmed that decoupling does occur. For explosions … continued below

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159 pages : illustrations

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Adams, William M. & Allen, DeWitt C. August 1960.

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  • Lawrence Radiation Laboratory
    Publisher Info: University of California, Lawrence Radiation Laboratory
    Place of Publication: Livermore, California

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  • Main Title: Project Cowboy : Final Report : Seismic Decoupling for Explosions in Spherical Cavities
  • Added Title: UCRL (Series)
  • Series Title: University of California Radiation Laboratory Reports
  • Added Title: University of California Radiation Laboratory Report UCRL-6086

Description

A series paired explosions in a salt mine near Winnfield, Louisiana, has been conducted to test a theory by A.L. Latter concerning seismic decoupling by underground cavities. The theory predicted a decoupling of 132 Free-field and surface measurements from an explosion in either a 6-ft- or a 15-ft-radius spherical cavity were compared with similar measurements from a completely tamped explosion of equal size. Shot sizes were from 20 pounds up to a ton. Surface measurements were made out to 100 km and covered the frequency range from 0.05 to 100 cps. The experiments confirmed that decoupling does occur. For explosions that produce an average cavity pressure up to one-fifth and possible more of the lithostatic overburden pressure, seismic waves were decoupled by the 100, i.e., two order of magnitude. Even for explosions producing an average cavity pressure of six times the lithostatic overburden pressure, the seismic waves were decoupled by 20 -- more than a full order of magnitude. Minimum decoupling factors as a function of frequency are presented.

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159 pages : illustrations

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Digitized from microopaque cards (6).

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  • OCLC: 935550132
  • SuDoc Number: Y 3.AT 7:22/UCRL-6086
  • Grant Number: W-7405-eng-48
  • Report No.: UCRL-6086
  • Accession or Local Control No: metadc784103
  • Archival Resource Key: ark:/67531/metadc784103

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  • August 1960

Added to The UNT Digital Library

  • March 24, 2021, 8:15 a.m.

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  • June 19, 2024, 5:31 a.m.

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Adams, William M. & Allen, DeWitt C. Project Cowboy : Final Report : Seismic Decoupling for Explosions in Spherical Cavities, report, August 1960; Livermore, California. (https://digital.library.unt.edu/ark:/67531/metadc784103/: accessed July 19, 2026), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.

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