Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999geoji.137..747d&link_type=abstract
Geophysical Journal International, Volume 137, Issue 3, pp. 747-754.
Astronomy and Astrophysics
Astronomy
28
Anisotropy, Surface Waves, Tomography, Waveform Inversion
Scientific paper
The pattern of azimuthal anisotropy for SV waves in the upper mantle beneath Australia has been determined using a two-stage tomographic procedure for Rayleigh waves. The inversion exploits an automated procedure based on the waveform inversion method of Cara & Lévêque (1987) to allow the analysis of 668 vertical-component seismograms within a few weeks. The automated procedure provides an effective choice of the secondary observables used in the waveform inversion for both fundamental and higher modes, allowing the construction of a set of radially stratified upper-mantle models which represent the average structures on paths criss-crossing the Australian continent. The 668 path-average models are then combined in a 3-D velocity model which describes the lateral variation of the SV velocity and its azimuthal anisotropy. The lateral variations in wave speed show a good overall agreement with previous results for shear wave-speed variations in Australia but are accompanied by significant azimuthal anisotropy. At 150 km depth the anisotropy displays a simple pattern with most of the directions of fast SV velocities dominated by a north-south component close to the present-day absolute plate motion. Nevertheless, in the regions with the highest shear wave speed, anisotropy is not aligned with the current plate motion, suggesting a local resistance to mantle flow.
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