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The Bass Strait Upper Mantle Project was a seismic refraction experiment carried out to determine the crustal thickness variation under S.E. Australia. A time term solution for the mantle first arrival data indicsttes a considerable crustal thinning in Bass Strait. Crustal thickness estimates give values of 30-35 kms for Victoria and Tasmania and 20-25 kms for Bass Strait.
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Bruce D. Johnson (1973) studied this question.
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