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Published January 12, 1984 | public
Journal Article

Aspherical heterogeneity of the mantle from phase velocities of mantle waves


Long-period surface waves are used to map the lateral heterogeneity of the upper 100–600 km of the mantle. There is good correlation of velocity with surface tectonics and heat flow. Convergence regions are generally slow for Love waves and fast for Rayleigh waves. Back arc basins have slower than average shallow mantle. Some island arcs show evidence of fast material at greater depth. Deep-seated slow anomalies underlie the Red Sea–Afar region of north-east Africa, western North American–northern East Pacific Rise, Indian Ocean triple junction and the Tasman Sea–Campbell Plateau regions. The fastest regions are in the north central Australia–New Guinea and the South Atlantic.

Additional Information

© 1984 Macmillan Journals Ltd. Received 28 June; accepted 14 September 1983. We thank Henri-Claude Nataf, Hiroo Kanamori, and Bradford Hager for suggestions. Jeffrey Given, Fumiko Tajima, and Jeanne Sauber helped us retrieve the seismograms from the GDSN day tapes at an early stage of this study. The IDA data used in this study were made available by courtesy of the IDA project team at the Institute of Geophysics and Planetary Physics, University of California, San Diego. This research was supported by NASA grant NSG-7610 and NSF grant EAR811-5236. Contribution no. 3912, Division of Geological and Planetary Sciences, California Institute of Technology.

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