1887
Volume 9 Number 1
  • E-ISSN: 1365-2478

Abstract

A

Difficulties may arise in refraction seismic surveys in the case of thin layers.

Seismograms have been realized by means of ultrasonic model techniques and have led to some results about the propagation of refracted waves along thin layers. The velocities of propagation have been determined as a function of the layer thickness.

When the layer thickness is small compared to the wave length, it is shown that:

— the velocities of propagation of refracted waves can be up to 6 % less than the velocities along thick layers.

— the attenuation of amplitude with distance becomes large.

— the determination of depth from measurements of delays gives doubtful results.

Experiments have been run on two dimensional models but extension of the results to three dimensional cases is possible.

Loading

Article metrics loading...

/content/journals/10.1111/j.1365-2478.1961.tb01121.x
2006-04-27
2024-04-18
Loading full text...

Full text loading...

References

  1. Bois, P., Chauveau, J., Grau, G., Lavergne, M., 1960, Sismogrammes synthétiques: possibilités, techniques de réalisation et limitations, Geophysical Prospecting, vol. 8, no. 2, p. 220.
    [Google Scholar]
  2. Brune, J. N., Nafe, J. E., Oliver, J. E., 1960, A simplified method for the analysis and synthesis of dispersed wave trains, Geophysical Research, vol. 65, no. 1, p. 287.
    [Google Scholar]
  3. Cagniard, L., 1939, Reflexion et réfraction des ondes sismiques progressives, Gauthiers‐Villars, Paris .
    [Google Scholar]
  4. Cremer, L., 1942, Theorie der Schalldämmung dünner Wände bei schrägem Einfall, Akust. Zeitschrift, vol. 7, p. 81.
    [Google Scholar]
  5. Ewing, W. M., Jardetzky, W. S., Press, F., 1957, Elastic waves in layered media, Me Graw Hill, New‐York .
    [Google Scholar]
  6. Fay, R. D., Fortier, O. V., 1951. Transmission of sound through steel plates immersed in water, Jour, of the Acoust. Soc. of Amer., vol. 23, no. 3, p. 339.
    [Google Scholar]
  7. Götz, J., 1943, Uber den Schalldurchgang durch Metallplatten in Flüssigkeiten bei schrägem Einfall einer ebenen Welle, Akust. Zeitschrift, vol. 8, p. 145.
    [Google Scholar]
  8. Lavergne, M., 1960, Etudes sur modèles sismiques, Thèse de Doctorat, 3° cycle, Faculté des Sciences, Université de Paris.
  9. Lavergne, M., Chauveau, J., 1961, Fonctions de transfert d'émetteurs et de capteurs Riézoélectriques pour modèles sismiques, Acustica, vol. 11, no. 2. (sous presse).
    [Google Scholar]
  10. Miller, G. F., Pursey, H., 1954, The field and radiation impedance of mechanical radiators on the free surface of a semi‐infinite isotropic solid, Proc. Roy. Soc. London, vol. 223, A, p. 521.
    [Google Scholar]
  11. Osborne, M. F. M., Hart, S. D., 1945, Transmission, reflection and guiding of an exponential pulse by a steel plate in water, Jour. of the Acoust. Soc. of Amer., vol. 17, p. 1.
    [Google Scholar]
  12. Press, F., Oliver, J., Ewing, M., 1954, Seismic model study of refractions from a layer of finite thickness, Geophysics, vol. 19, p. 388.
    [Google Scholar]
  13. Redwood, M., 1959, Velocity and attenuation of a narrow band high frequency compressionnal pulse in a solid wave guide, Jour. of the Acoust. Soc. of Amer., vol. 31, p. 442.
    [Google Scholar]
  14. Redwood, M., 1960, Mechanical wave guides, Pergamon Press, London .
    [Google Scholar]
  15. Reissner, H., 1937, Der senkrechte und schräge Durchtritt einer in einem flüssigen Medium erzeugten ebenen Dilatations — longitudinal — Welle durch eine in diesem medium befindliche plan parallele feste Platte, Helv. Phys. Acta, vol. 11, p. 140.
    [Google Scholar]
  16. Schoch, A., 1950, Der Durchgang Ultraschall durch Platten, Nuovo cimento, ser. 9, vol. 7 (suppl.), p. 302.
    [Google Scholar]
  17. Sezawa, K., Nishimura, G., 1928, Rayleigh‐type waves propagated along an inner stratum of a body, Bull. Earthquake Research Inst. (Tokio), vol. 5, p. 85.
    [Google Scholar]
  18. Tolstoy, I., Usdin, E., 1953, Dispersive properties of stratified elastic and liquid media: a ray theory, Geophysics, vol. 18, p. 844.
    [Google Scholar]
http://instance.metastore.ingenta.com/content/journals/10.1111/j.1365-2478.1961.tb01121.x
Loading
  • Article Type: Research Article

Most Cited This Month Most Cited RSS feed

This is a required field
Please enter a valid email address
Approval was a Success
Invalid data
An Error Occurred
Approval was partially successful, following selected items could not be processed due to error