Crust and upper mantle structure in East Antarctica from phase velocity of Rayleigh wave

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Phase velocities of Rayleigh waves in East Antarctica are accurately measured by using the two-station method in this study Rayleigh waves from the 16 May 1995 Loyalty Islands earthquake (23 05°S, 17000°E, Mv, 77) recorded at Dumont d'Urville (66 665°S, 140010°E) and Syowa (69 009°S, 39 592°E) stations, Antarctica, are used The path runs through the central part of East Antarctica The measured phase velocities at periods shorter than 40 s are higher than those shown by a previous study in which the paths run through the western part of East Antarctica It is suggested that the seismic velocity in the crust beneath the central part of East Antaictica is faster or the crustal thickness is thinner than that beneath the western part A preliminary 1-D seismic stiucture model of the crust and uppermost mantle beneath East Antarctica is inferred from the measured phase velocities The velocity in the crust and the uppermost mantle is higher than the A-1 model and PREM, respectively
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