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Published June 15, 1969 | Published
Journal Article Open

Shear Velocities and Elastic Parameters of the Mantle


The recent shear wave travel-time data of Ibrahim and Nuttli (1967) and Doyle and Hales (1967) is reinterpreted to yield a shear-velocity structure that is compatible with Johnson's (1967) compressional-velocity structure. The elastic parameters Φ, K/μ, and σ are calculated as a function of depth. All three parameters increase with depth in the homogeneous regions of the mantle but only Φ increases through the transition regions. Poisson's ratio is apparently less for the close-packed deeper mantle phases than it is for the normal phases of the upper mantle. The theoretical prediction that dμ/dP becomes negative before a phase change is verified by the seismic data.

Additional Information

© 1969 American Geophysical Union. Received February 17, 1969; revised March 12, 1969. Contribution No. 1615, Division of Geological Sciences. California Institute of Technology, Pasadena. This research was supported by the Advanced Research Projects Agency of the Department of Defense and was monitored by the Air Force Office of Scientific Research under. Contract No: F44620-69-C-0067 and National Science Foundation grant GA 1003. We would like to thank A. Ibrahim, O. Nuttli, A. Hales and H. Doyle for advance copies of their manuscripts.

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