Rayleigh‐wave phase velocities in French Polynesia

Emile A. Okal*, Jacques Talandier

*Corresponding author for this work

Research output: Contribution to journalArticle

15 Scopus citations

Abstract

b Rayleigh‐wave phase velocities are investigated in the period range 17–100 s by the two‐station method over several paths covering most of French Polynesia. Our results confirm the validity of theoretical models obtained through regionalization of data pertaining to longer paths. They also exhibit a 2–3.5 per cent anisotropy, with the axis of maximum velocity oriented in the direction of spreading of the plate. Part of this anisotropy is, however, due to the presence of the Tuamotu archipelago; when this is removed, the remaining anisotropy (about 1.5 per cent) correlates with the present direction of spreading, indicating that a relaxation of the anisotropy has taken place since the East Pacific ridge jump. Finally, the presence of the Tuamotu Islands explains anomalous waveshapes for surface waves travelling in their vicinity, due to multipathing through their faster structure.

Original languageEnglish (US)
Pages (from-to)719-733
Number of pages15
JournalGeophysical Journal of the Royal Astronomical Society
Volume63
Issue number3
DOIs
StatePublished - Dec 1980

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics

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