Physics
Scientific paper
Oct 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983pepi...33..164l&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 33, Issue 3, p. 164-179.
Physics
29
Scientific paper
Two Tonga-trench earthquakes recorded in North America on WWSSN long-period instruments have been processed by making use of spatial analysis techniques to retrieve the phase velocities of Love wave modes. Dispersion data up to the third overtone at periods longer than 30 s have been obtained for two broad areas: the Pacific Ocean and North America. It is found that the observed Love wave phase velocities are not in agreement with the values predicted from the previously published models inferred from Rayleigh wave data. Phase velocity discrepancies as large as 3-4% in the Pacific Ocean and 2% in North America are observed up to the second overtone. Preliminary direct computations, which have been performed in the framework of transversely isotropic models with the axis of symmetry oriented vertically, suggest that the cause for this departure from isotropy probably extends to depths > 200 km.
Cara Michel
Lévêque Jean-Jacques
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