Non-Stationary Time Series Analysis - MT Applications

L. M. Hastie; I. J. Chant

doi:10.1071/EG993163

ISSN: 0812-3985
E-ISSN: 1834-7533

Non-Stationary Time Series Analysis - MT Applications
Authors L. M. Hastie^a and I. J. Chant^b
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^a Physics DepartmentUniversity of Queensland, Queensland, , 4072 ^b Microwave Radar Division Surveillance Research Laboratories Defence Science and Technology Organisation, Salisbury, , SA, 5108
Publisher: Australian Society of Exploration Geophysicists
Source: Exploration Geophysics, Volume 24, Issue 2, Jun 1993, p. 163 - 166
DOI: https://doi.org/10.1071/EG993163
- Published online: 01 Jun 1993

Abstract

The EMSLAB data set (Jones et al., 1989) has been processed using time-frequency methods to estimate the apparent resistivities and phases. When compared to the results from traditional methods, the time-frequency analysis has produced different apparent resistivity estimates for the noisier component, while the phases and the apparent resistivity estimates for the component with the stronger signal are very similar. This is consistent with the bias being due to nonstationary effects, and could indicate that this type of analysis will significantly improve the quality of magnetotelluric data.

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References

Chant, I.J. and Hastie L.M. (1992). ‘Time-frequency analysis of magnetotelluric data’. Geophys. J. Int. 111, 399-413.
Chave, A. D. and Thomson, D. J. (1992). ‘Some comments on magnetotelluric response function estimstion’. J. Geophys. Res. 94, 14215-14225.
Cohen, L. (1967). ‘Generalized phase space distributions’. J. Math. Phys. 7, 181-186
Dekker D. L. and Hastie L. M. (1981). ‘Sources of error and bias in a magnetotelluric depth sounding of the Bowin Basin’. Phys. Earth Plan. Int. 25, 219-225.
Harris, F. (1992). ‘Techniques and limitations of spectrum analysis with the DFT’. Time-Frequency Signal Analysis, Boashash (ed), Halsted Press, ISBN 0-582-71286-6.
Jones, A. G., Chave, A. D., Egbert, G., Auld, D. and Bahr, K. (1989). ‘A comparison of techniques for magnetotelluric response function estimation’. J. Geophys. Res. 94, 14201-14213.
Zhao, Y., Atlas, L.E., and Marks, R.J., (1990). ‘The use of cone-shaped kernels for generalized time-frequency representations of nonstationary signals’. IEEE Trans. Acoustic. Speech Signal Process. 38, 1084-1091.

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Article Type: Research Article

Keyword(s): EMSLAB; magnetotelluric; time-frequency

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Non-Stationary Time Series Analysis - MT Applications

Abstract

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