Inverting the head wave coefficient with multi-fold near-surface seismic refraction data

Derecke Palmer

doi:10.1080/22020586.2019.12072941

2nd Australasian Exploration Geoscience Conference: Data to Discovery

ISSN: 2202-0586
E-ISSN:

oa Inverting the head wave coefficient with multi-fold near-surface seismic refraction data
Authors Derecke Palmer^a
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^a The University of New South Wales, Sydney, 2052, Australia, [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: ASEG Extended Abstracts, Volume 2019, Issue 2nd Australasian Exploration Geoscience Conference: Data to Discovery, Dec 2019, p. 1 - 4
DOI: https://doi.org/10.1080/22020586.2019.12072941
- Published online: 01 Dec 2019

Abstract

Summary

The head wave coefficient (HWC), the refraction analogue of the reflection coefficient, is a complex function of the densities and the P- and S-wave velocities in both the weathered and sub-weathered regions. In general, the HWC increases with increasing P- and S-wave velocities in the weathered layer, but it decreases with increasing P- and S-wave seismic velocities in the sub-weathered layer.

Unscaled S-wave velocities in the weathered and sub-weathered regions can be computed with the HWCs for each interface and the detailed P-wave seismic velocities in each layer, using various approximations for the HWC. In general, there is excellent agreement between the measured and computed HWCs. However, some form of traveltime-based estimate of the S-wave velocities is required to calibrate the amplitude-based estimates.

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2026-01-25

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References

Červený, V., Ravindra, R., 1971, Theory of seismic head waves, Toronto, University of Toronto Press.
Cox, M. J. G., 1999, Static corrections for seismic reflection surveys. Society of Exploration Geophysicists, Tulsa.
Heelan, 1953, On the theory of head waves. Geophysics, 18, 871-893.
Meulenbroek, A. M., 2016. Inversion of seismic refraction amplitudes for near-surface velocity control. M Ph thesis, Univ. of Queensland, 313p.
O’Brien, P. N. S., 1967, The use of amplitudes in seismic refraction survey, in Musgrave, A.W., Ed., Seismic refraction prospecting: Society of Exploration Geophysicists, 85–118.
Palmer, D, 2001, Resolving refractor ambiguities with amplitudes, Geophysics 66, 1590-1593.
Palmer, D., 2015, Is accuracy more important than precision in near surface refraction seismology? Near Surface Geophysics, 13, 1-18.
Sheriff, R. E., and Geldart, L. P., 1995, Exploration seismology: Cambridge Univ. Press.
Werth,G. A., 1967, Method for calculating the amplitude of the refraction arrival, in Musgrave, A.W., Ed., Seismic refraction prospecting: Society of Exploration Geophysicists, 119–137.

/content/journals/10.1080/22020586.2019.12072941

Article Type: Research Article

Keyword(s): amplitudes; head wave coefficient; inversion; refraction; S-wave velocities

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