Rayleigh-wave group velocity distribution in the Antarctic region

Details Rayleigh-wave group velocity distribution in the Antarctic region Rayleigh-wave group velocity distribution in the Antarctic region

Mar 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004pepi..141..167k&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 141, Issue 3, p. 167-181.

Physics

1

Scientific paper

We determined 2D group velocity distribution of Rayleigh waves at periods of 20-150s in the Antarctic region using a tomographic inversion technique. The data are recorded by both permanent networks and temporary arrays. In East Antarctica the velocities are high at periods of 90-150s, suggesting that the root of East Antarctica is very deep. The velocities in West Antarctica are low at all periods, which may be related to the volcanic activity and the West Antarctic Rift System. Low velocity anomalies appear at periods of 40-140s along the Southeastern Indian Ridge and the western part of the Pacific Antarctic Ridge. The velocities are only slightly low around the Atlantic Indian Ridge, Southwestern Indian Ridge, and the eastern part of the Pacific Antarctic Ridge, where the spreading rates are small. Around two hotspots, the Mount Erebus and Balleny Islands, the velocity is low at periods of 50-150s.

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