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Published July 15, 2001 | public
Journal Article

Evidence for a sharp lateral variation of velocity at the core-mantle boundary from multipathed PKPab


Rapid changes in differential travel times between the various PKP branches have been attributed to strong lateral velocity variations at the base of the mantle. Differential time PKPab–df residuals showing jumps of up to 2 s for paths only 100 km apart have been reported. Such extreme changes in travel times for signals with comparable wavelengths suggest ray bifurcation with multipaths containing slow and fast contributions to PKPab. Here we report on some well-documented normal and multipathed PKPab phases along with rapidly varying differential time residuals observed for Fiji events with paths sampling the northern edge of the mid-Pacific large slow structure beneath Hawaii. Systematic analyses of these data with two-dimensional models suggest the presence of a ridge-shaped structure at the core–mantle boundary containing abrupt reductions of P-wave velocity of up to 10%. This narrow ultralow velocity zone (ULVZ) is located at the boundary between a large scale low velocity and high velocity structure, corroborating recent dynamic models which propose that ULVZs preferentially occur at the boundary between hot and cold mantle domains and could be related to plume activity at Hawaii.

Additional Information

© 2001 Elsevier Science B.V. Received 25 January 2001; received in revised form 30 April 2001; accepted 1 May 2001. This research has been supported by National Science Foundation Grants EAR-9725808 and EAR-9629279. We thank Don Anderson, Xiaodong Song, Mike Gurnis, Jereon Ritsema and Paul Asimow for helpful suggestions and thoughtful comments. The comments by Thorne Lay and an anonymous reviewer helped to improve the manuscript. Contribution No. 8747 of the Division of Geological and Planetary Sciences, California Institute of Technology.[RV]

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