Observations of the phase SP at distances less than 40° |
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| Authors: | L Hendrajaya K J Muirhead G Bock |
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| Institution: | Research School of Earth Sciences, Australian National University, institute of Advanced Studies, PO Box 4, Canberra, ACT 2601, Australia |
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| Abstract: | Summary. A detailed analysis of short-period shear waves using an array of three component seismometers near Tennant Creek in the centre of northern Australia has found only isolated samples of the phase Sp which, for a mode conversion at the crust/mantle boundary precedes the S arrival by about 6 s. Two strong phases commonly observed in the S wavetrain in the distance range 30–40° with a time separation of between 6 and 8 s have been determined to be the phases S and SP respectively. Contrary to the Jeffreys-Bullen seismological tables, SP is first generated at a minimum distance not of 40°, but rather in the vicinity of 20°. |
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