Experimental evidence to support the double head wave method of generating a rare faction first motion

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An earlier report suggested a double headwave method of generating a rarefaction first motion. In this method a geologic situation is selected so that energy that has been critically refracted once above the shot and once below shot arrives first. Since the theory of headwaves gives in the usual stationary phase approximation a ninety degree phase shift for each critical refraction, energy that has been critically refracted twice produces a 180 degree phase shift. Oil well data was presented to show that the necessary geologic situation exists in nature. A question has come up regarding the propagation of long wave ... continued below

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7 p.

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Werth, G. C. November 25, 1959.

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Description

An earlier report suggested a double headwave method of generating a rarefaction first motion. In this method a geologic situation is selected so that energy that has been critically refracted once above the shot and once below shot arrives first. Since the theory of headwaves gives in the usual stationary phase approximation a ninety degree phase shift for each critical refraction, energy that has been critically refracted twice produces a 180 degree phase shift. Oil well data was presented to show that the necessary geologic situation exists in nature. A question has come up regarding the propagation of long wave lengths (16,000 ft) in the thin bed (3000 ft.) above the shot in the geologic situation cited in the earlier report. At the tine of writing of the report it was realized that the thickness of the bed should be considered in propagating the 3 to 5 wavelengths along the bed. The theoretical problem of propagation in high speed elastic bed has not been solved. The best information available at this time indicates that it might indeed be possible to go out into reef country and experimentally find a location suitable to generate a rarefaction first motion by the double head wave method. As in the earlier report this scheme is offered only as a second method that could fool a set of rules regarding first notions.

Physical Description

7 p.

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OSTI as DE97051315

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  • Other Information: PBD: 25 Nov 1959

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  • Other: DE97051315
  • Report No.: UCRL--5802-T-Draft
  • Grant Number: W-7405-ENG-48
  • DOI: 10.2172/459857 | External Link
  • Office of Scientific & Technical Information Report Number: 459857
  • Archival Resource Key: ark:/67531/metadc676575

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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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  • November 25, 1959

Added to The UNT Digital Library

  • July 25, 2015, 2:21 a.m.

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  • Feb. 18, 2016, 5:04 p.m.

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Werth, G. C. Experimental evidence to support the double head wave method of generating a rare faction first motion, report, November 25, 1959; California. (digital.library.unt.edu/ark:/67531/metadc676575/: accessed December 13, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.