Abstract
Abstract Officer, in 1955, examined the group velocities of Rayleigh and Love waves in the Tasman Basin. He found that the earth's crust there was oceanic. More detailed models of oceanic crust than those available to Officer are now available. The group velocities of Rayleigh and Love waves are consistent with a thickness of approximately 1 km for the unconsolidated sediments in the Tasman Basin and a crustal thickness of approximately 7 km. Phase velocities of Rayleigh and Love waves between the Worldwide Standard Stations, Riverview and Wellington, show that the average shear velocity in the uppermost mantle between these stations is approximately 4 · 6 km/s.
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