Investigation of upper mantle structure under young regions of the southeast Pacific using long-period Rayleigh waves

Details Investigation of upper mantle structure under young regions of the southeast Pacific using long-period Rayleigh waves Investigation of upper mantle structure under young regions of the southeast Pacific using long-period Rayleigh waves

Dec 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981pepi...27..206m&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 27, Issue 3, p. 206-222.

Physics

34

Scientific paper

Long-period Rayleigh wave group velocity dispersion curves are presented for paths across the east Pacific Ocean. The records are from the IPG site at Pamatai (Tahiti) and the IDA station at Nana. For the first time, direct-path observations of group velocities up to 300 s have been obtained. This study shows that for young oceanic regions group velocities are low even at long periods. The observations are interpreted in terms of an S-wave velocity model by a generalized inversion scheme. In the models for young ages, the low-velocity zone under the asthenosphere lid is well developed, with a strong velocity gradient at the bottom of this zone, followed at larger depths by a plateau representing a lower-velocity zone, and a marked gradient at 400 km.

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