A Tidal Strain Model for Hillgrove Gorge, Eastern Australia

Blair, D. P.; Sydenham, Peter H.

doi:10.1111/j.1365-246x.1976.tb01637.x

Cited by 2 publications

(1 citation statement)

References 6 publications

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“…Langdon & Thomas (1974) attempted to measure the solid tidal strain in South-eastern Australia, however, their strain meter was located only about 15 m below the surface, hence their measurements were influenced by a rather large thermal contamination. Blair & Sydenham (1976) reported measurements of multidirectional tidal strain components obtained in the Cooney Observatory, Eastern Australia. The latter measurements were not significantly influenced by thermal effects since the instruments were located about 400 m or so below the surface.…”

Section: Introductionmentioning

confidence: 99%

Solid tidal tilting observed in the West Australian goldfields

Blair

1981

Geophysical Journal International

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Experimental tidal tilts were obtained in the Eastern Goldfields region of Western Australia. Spectral data are given for the total tilt in one direction only and the results compared with the theory. The main semidiurnal (M2) component is extracted by Fourier techniques and it is shown that analysis of a data length 57 periods of the M 2 wave (or 29.50 sidereal day) yields less uncertainty in the estimation of the Mz amplitude than does analysis of a longer data length of 70M2 periods (or 36.23 sidereal day). Furthermore it is shown that use of a simple rectangular gate time window yields less uncertainty in the Fourier estimation of the Mz amplitude than that obtained using the well-known Hanning and Hamming windows. Phasor plots of the Mz tilt tide are also given for two distinct methods of tilt meter mounting t o the bedrock. In the present investigation tilt-strain coupling due to both the cavity effect and local topography is considered negligible, however tilt-strain coupling due to the geological effect is not necessarily negligible and is evaluated using a boundary integral method.

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Section: Introductionmentioning

confidence: 99%

Solid tidal tilting observed in the West Australian goldfields

Blair

1981

Geophysical Journal International

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Topographic, geologic and cavity effects on the harmonic content of tidal strain

Blair

1977

Geophysical Journal International

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The combined effects of topography, geology and cavities upon the measurements of tidal strains are considered. A theoretical model is proposed in which the topography and geology are modelled with finite elements, and the cavity (assumed to be elliptical) modelled using the analytical theory. The three effects are then superimposed to form a total model. Previous experimental results obtained for the solid tidal strain in Eastern Australia (Blair & Sydenham) are compared with the present theoretical model and reasonable agreement is found assuming values of the Love numbers for the Gutenberg-Bullen A earth model in which h = 0.61 and 1 = 0.08 (Farrell). Further experimental results are presented for two strain meters, only one of which is not significantly influenced by the cavity. The relative difference, in harmonic content between the recordings of both strain meters is compared with that predicted by the theoretical model. Present address: Western Australian School of Mines, Kalgoorlie, 6430 Western Australia.

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A Tidal Strain Model for Hillgrove Gorge, Eastern Australia

Cited by 2 publications

References 6 publications

Solid tidal tilting observed in the West Australian goldfields

Solid tidal tilting observed in the West Australian goldfields

Topographic, geologic and cavity effects on the harmonic content of tidal strain

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