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Anisotropy of the inner core inferred from PKIKP travel times
Abstract
Travel‐time residuals of the PKIKP phase observed between 170° and 180° show an axisymmetric pattern of degree 2 with an amplitude of about 2 seconds. The effect at shorter distances is much less pronounced and the entire data set cannot be explained by a physically realistic radial distribution of (isotropic) heterogeneity. We propose that, in addition to the general (isotropic) heterogeneity, the inner core is anisotropic with cylindrical symmetry aligned with the earth's rotation axis. Average P‐velocity along this axis is about 1 percent faster than in the equatorial plane.
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Cited by
Equations governing convection in earth's core and the geodynamo
Braginsky, S. I., & Roberts, P. H. (1995) · Geophysical & Astrophysical Fluid Dynamics · doi:10.1080/03091929508228992 · Cited by 529
Seismological evidence for differential rotation of the Earth's inner core
Song, X., & Richards, P. G. (1996) · Nature · doi:10.1038/382221a0 · Cited by 445
Tanaka, S., & Hamaguchi, H. (1997) · Journal of Geophysical Research: Solid Earth · doi:10.1029/96jb03187 · Cited by 310
Heterogeneity and Anisotropy of Earth's Inner Core
Deuss, A. (2014) · Annual Review of Earth and Planetary Sciences · doi:10.1146/annurev-earth-060313-054658 · Cited by 114
Reconciling the hemispherical structure of Earth’s inner core with its super-rotation
Waszek, L., Irving, J., & Deuss, A. (2011) · Nature Geoscience · doi:10.1038/ngeo1083 · Cited by 91
Metadata
- Authors
- Morelli, A., Dziewonski, A. M., & Woodhouse, J. H.
- Venue
- Geophysical Research Letters
- Publisher
- American Geophysical Union (AGU)
- Published
- 1986-12
- Volume
- 13
- Issue
- 13
- Pages
- 1545-1548
- ISSN
- 0094-8276 (ISSN-L)
- 1944-8007
- OpenAlex
- W2070798574
- Cited by
- 414
- References
- 0
- FWCI
- 5.90
- Type
- journal article
- Language
- en
- Open access
- closed
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- CoChat. (2026). Citation check: Anisotropy of the inner core inferred from PKIKP travel times. https://app.cochat.ai/papers/10.1029/gl013i013p01545
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- Morelli, A., Dziewonski, A. M., & Woodhouse, J. H. (1986). Anisotropy of the inner core inferred from PKIKP travel times. Geophysical Research Letters. https://doi.org/10.1029/gl013i013p01545
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