Phase velocity distribution in the Indian Ocean and Indonesian region inferred from Geoscope records

Details Phase velocity distribution in the Indian Ocean and Indonesian region inferred from Geoscope records Phase velocity distribution in the Indian Ocean and Indonesian region inferred from Geoscope records

Apr 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987georl..14..343r&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 14, April 1987, p. 343-346.

Physics

8

Earthquakes, Indian Ocean, Indonesia, Phase Velocity, Seismic Waves, Velocity Distribution, Propagation Velocity, Three Dimensional Models, Wave Propagation

Scientific paper

Direct earthquake-to-station phase velocity measurements of Rayleigh waves observed from the vertical long-period components of four Geoscope stations were analyzed to verify and improve the velocity maps obtained by three-dimensional models of seismic wave velocities in the Indian Ocean and surrounding regions. After correcting the phase velocities for the phase pattern at the source and for the instrumental response, a tomographic method was applied to compute the geographical distribution of phase velocities. The most prominent features of the phase velocity distributions are similar to those exhibited in global studies: the north/south oriented high velocity anomaly under the West Australian shield, confirmed for all periods, extends southward to the central part of the southeast Indian Ridge, as in the models of Nakanishi and Anderson (1984), Montagner (1986), Nataf et al. (1986), and Tanimoto (1985).

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