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Wiley InterScience | |||
  Geophysical Journal InternationalVolume 162 Issue 3, Pages 787 - 792 Published Online: 7 Jul 2005 Journal compilation © 2010 RAS Published on behalf of the Royal Astronomical Society
Abstract | References | Full Text: HTML, PDF (Size: 297K) | Related Articles | Citation Tracking  Constraints on the outer-core tangent cylinder using normal-mode splitting measurements Copyright 2005 RAS KEYWORDS density • free oscillations • inner core • outer core • seismic velocities • tomography ABSTRACTAssuming that the heterogeneity within the outer core takes the form of a tangent cylinder, the normal-mode splitting data are inverted for constraints on perturbations in compressional wave speed and density. The trade-off between the mantle, outer core and the inner core is explored with various data subsets, model parametrizations, damping strengths and data correction. In addition, an estimate of uncertainty is obtained by the Monte Carlo simulations. The resulting values within the tangent cylinder are 0.06 ± 0.12 per cent for compressional wave speed and −0.06 ± 0.20 per cent for density, and they suggest that the tangent cylinder is seismically homogeneous with the rest of the outer core. Accepted 2005 January 13. Received 2004 December 2; in original form 2004 March 12 | 
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