Optimum frequencies for regional detection of cavity-decoupled explosions

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Description

The natures of compressional (P) waves that originate in the crust, propagate in the crust and upper mantle, and are observed as Pg, Pn, and anti P waves at regional distances are examined. The discussion includes the observed variations of amplitude with epicentral distance for these waves as well as an estimate of values for the specific dissipation function Q/sub ..cap alpha../ in different regions. Studies were made on theoretical source and propagation functions for direct, reflected, and head waves as approximations for the observed Pg, anti P, and Pn, respectively. It was concluded that the classical (critically refracted) head ... continued below

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Pages: 22

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Rodean, H.C. March 21, 1979.

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  • Lawrence Livermore Laboratory
    Publisher Info: California Univ., Livermore (USA). Lawrence Livermore Lab.
    Place of Publication: Livermore, California

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Description

The natures of compressional (P) waves that originate in the crust, propagate in the crust and upper mantle, and are observed as Pg, Pn, and anti P waves at regional distances are examined. The discussion includes the observed variations of amplitude with epicentral distance for these waves as well as an estimate of values for the specific dissipation function Q/sub ..cap alpha../ in different regions. Studies were made on theoretical source and propagation functions for direct, reflected, and head waves as approximations for the observed Pg, anti P, and Pn, respectively. It was concluded that the classical (critically refracted) head wave is not very significant in regional observations, and that the related interference head wave and diving wave are more likely observed as Pn. Using an assumed seismic noise spectrum and the constant Q/sub ..cap alpha../ model for seismic attenuation, relations were derived for the frequencies corresponding to maximum signal-to-noise ratio for the classical and interference head waves and for the direct, reflected, and diving waves. The relations among seismic frequency, epicentral distance, anelastic attenuation, and explosion yield are illustrated for a simple source and propagation model.

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Pages: 22

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Dep. NTIS, PC A02/MF A01.

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  • Report No.: UCRL-52690
  • Grant Number: W-7405-ENG-48
  • DOI: 10.2172/6191872 | External Link
  • Office of Scientific & Technical Information Report Number: 6191872
  • Archival Resource Key: ark:/67531/metadc1107997

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • March 21, 1979

Added to The UNT Digital Library

  • Feb. 22, 2018, 7:45 p.m.

Description Last Updated

  • May 9, 2018, 12:41 p.m.

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Rodean, H.C. Optimum frequencies for regional detection of cavity-decoupled explosions, report, March 21, 1979; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc1107997/: accessed September 23, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.