1887
Volume 13, Issue 3
  • ISSN: 0812-3985
  • E-ISSN: 1834-7533

Abstract

Crustal thickness and average seismic velocity can be determined by fitting the spectral ratio of the vertical and horizontal radial components of teleseismic long-period seismic P-waves to the theoretical spectral ratio of feasible crustal models. The vertical and horizontal radial transfer functions are calculated by the Haskell-Thomson matrix formulation pointwise in the frequency domain, by estimating the transmission coefficient of a given layered system for each of a sequence of input frequencies at the base. The character of the spectral ratios is affected mainly by the total crustal thickness and average velocity. Knowledge of these parameters is particularly valuable in combination with complementary data from deep crustal seismic reflections at near vertical incidence. Comparison tests using data from the ASRO/HGLP installation at Charters Towers (near the Queensland continental margin, Australia) reveal that the mean crustal thickness at Charters Towers is about 40 km and the mean Moho P-wave velocity contrast is 0.8. These values are consistent with independently derived models of ‘normal’ continental crust.

© 1982 ASEG
Loading

Article metrics loading...

/content/journals/10.1071/EG982059
1982-09-01
2026-01-16

  • From This Site

    /content/journals/10.1071/EG982059
    dcterms_title,dcterms_subject,pub_keyword
    -contentType:Journal -contentType:Contributor -contentType:Concept -contentType:Institution
    10
    5
Loading full text...

Full text loading...

References

  1. Berteussen, K. A. (1977), ‘Moho depth determination based on spectral ratio analysis of NORSAR long-period P-waves’, Phys.Earth Planet.lnt. 15, 13-27.
  2. Clements, J. R. (1980), ‘Attenuation in the mantle, from spectral analysis of short-period seismic waves’, Ph.D. thesis, Australian National University, Canberra, A.C.T., Australia, pp. 164.
  3. Collins, C. D. N. (1978), ‘Central structure of the central Bowen Basin, Qld.’, B.M.R. J. Aust.Geol. and Geophys. 3, 203-209.
  4. Denham, D. (1971), ‘The thickness of the Earth’s crust obtained from the spectrum of P-waves at Charters Towers, Honiara, Port Moresby and Rabaul’, B.M.R. Aust.Rec. 1971/79, unpublished, pp. 11.
  5. Dooley, J. C. (1977), ‘Implications of Australian seismic and gravity measurements for the structure and composition of the upper mantle’, B.M.R. J. Aust.Geol. and Geophys. 2, 1-5.
  6. Finlayson, D. M. (1968), ‘First arrival data from the Carpentaria Region Upper Mantle Project (CRUMP)’, J.Geol.Soc.Aust. 15, 33-55.
  7. Hall, D. H. (1976), ‘Crustal studies: Their implications for the ex-plorationist’, Bull.Aust.Soc.Explor.Geophys. 7, 53-59.
  8. Hasegawa, H. S. (1971), ‘Crustal transfer ratios of short- and long-period body waves recorded at Yellowknife’, Bull.Seism.Soc. Am. 61, 1303-1320.
  9. Haskell, N. A. (1953), ‘The dispersion of surface waves on multi-layered media’, Bull.Seism.Soc.Am. 43, 17-34.
  10. Haskell, N. A. (1962), ‘Crustal reflection of plane P- and SV-waves’, J.Geophys.Res. 67, 4751-4767.
  11. Ingate, S. F. (1978), ‘Seismic methodology of gross crustal structure determination for long-period P’, B.Sc. (Hons) thesis. University of Sydney, unpublished, pp. 97.
  12. Leven, J. H. (1980), ‘The application of synthetic seismograms’, Ph.D. thesis, Australian National University, Canberra, A.C.T., Australia, pp. 234.
  13. Leong, L. S. (1975), ‘Crustal structure of the Baltic Shield beneath Umea, Sweden, from the spectral behaviour of long-period P-waves’, Bull.Seism.Soc.Am. 65, 113-126.
  14. Leong, L. S. (1977), ‘Crustal structure from spectral ratios of short-period P-waves’, Phys.Earth Planet.lnt. 14, 359-364.
  15. Phinney, R. A. (1964), ‘Structure of the Earth’s crust from the spectral behaviour of long-period body waves’, J.Geophys.Res. 69, 2997-3017.
  16. Phinney, R. A. & Jurdy, D. M. (1977), ‘Imaging of the deep crust’, Geophysics 42, 1632-1660.
  17. Thomson, W. T. (1950), ‘Transmission of elastic waves through a stratified solid medium’, J.Appl.Phys. 21 89-93. (Received 14 April, 1982; revised 27 May 1982)
/content/journals/10.1071/EG982059
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