Amplitude “statics” in shallow refraction seismology

Derecke Palmer

doi:10.1071/ASEG2001ab103

ISSN: 2202-0586
E-ISSN:

oa Amplitude “statics” in shallow refraction seismology
Authors Derecke Palmer^a
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^a University of New South Wales, , Australia, [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: ASEG Extended Abstracts, Volume 2001, Issue ASEG2001 - 15th Geophysical Conference, Dec 2001, p. 1 - 4
DOI: https://doi.org/10.1071/ASEG2001ab103
- Published online: 01 Dec 2001

Abstract

Increases in refracted amplitudes not related to changes in the head coefficient are usually associated with increases in traveltimes in the near-surface layers, while decreases in amplitudes are associated with decreases in traveltimes. These correlations demonstrate that the amplitude variations are related the variations in the near surface geology, rather than to variations in the coupling of the detectors with the ground.

The change in amplitude can be described with the transmission coefficient of the Zoeppritz equations. Correction factors can be applied for those surface conditions which are sufficiently extensive to permit the measurement of the wavespeed. Where this is not possible, then the lowest amplitude or amplitude product is representative of the head coefficient for the main refractor.

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2001-12-01

2026-01-24

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References

Bycroft, G. N., 1956, Forced vibrations of a rigid plate on a semi-infinite elastic space: Royal Society of London 248, 327-368.
Fail, J. P., Grau, G., and Lavergne, M., 1962, Couplage des sismographes avec le sol: Geophysical Prospecting 10, 128-147.
Lamer, A., 1970, Couplage sol-geophone: Geophysical Prospecting 18,300-319.
Palmer, D., 1980, The generalized reciprocal method of seismic refraction interpretation: Society of Exploration Geophysicists.
Palmer, D., 1986, Refraction seismics - the lateral resolution of structure and seismic: Geophysical Press.
Palmer, D., 2000a, Imaging refractors with the convolution section: Geophysics, in press.
Palmer, D., 2000b, Resolving refractor ambiguities with amplitudes: Geophysics, submitted.
Pieuchot, M., 1984, Seismic instrumentation: Geophysical Press.
Polak, E. J., 1969, Attenuation of seismic energy and its relation to the properties of rocks: Ph D thesis, University of Melbourne.

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Article Type: Research Article

Keyword(s): amplitudes; coupling; near-surface; refraction; statics

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oa Amplitude “statics” in shallow refraction seismology

Abstract

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