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Abstract

A regional gravity survey of Tasmania has revealed that the crust is of normal continental thickness (35 to 40 kms), increasing slightly under the Central Plateau region and thinning rapidly at the continental margin. The "regional" field, due to the variation in crustal thickness, has been obtained by approximating the observed data, using a terminated Fourier series; the trigonometric functions having been orthogonalised, with respect to the irregularly spaced data points, by the Gram-Schmidt method. A time-term analysis of the Bass Strait crustal refraction data indicates near normal thicknesses in Tasmania and intermediate thicknesses in Bass Strait (23-28 kms). Spectral analyses of high-level aeromagnetic data have indicated that, if the source layers of magnetic anomalies can be considered to give rise to a "white" spectrum, then the depth to the source layer is given by the gradient of the logarithm of the spectrum.

Item Type:	Thesis - PhD
Authors/Creators:	Johnson, Bruce David
Keywords:	Geology
Copyright Holders:	The Author
Copyright Information:	Copyright 1972 the Author - The University is continuing to endeavour to trace the copyright owner(s) and in the meantime this item has been reproduced here in good faith. We would be pleased to hear from the copyright owner(s).
Additional Information:	Thesis (Ph.D.) - University of Tasmania, 1972. Includes bibliography
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