Physics
Scientific paper
Jun 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29l...9h&link_type=abstract
Geophysical Research Letters, Volume 29, Issue 12, pp. 9-1, CiteID 1568, DOI 10.1029/2001GL014059
Physics
9
Mineral Physics: Elasticity And Anelasticity, Seismology: Core And Mantle, Seismology: Body Wave Propagation
Scientific paper
We report results from studying a region under the north Pacific using 46 ray paths along east-west and north-south directions to study the nature of inner core anisotropy, and find an anisotropy signal in differential PKPBC-PKPDF at about the resolution of the data, with north-south paths faster than east-west, but no dependence of attenuation on wavespeed or depth in this part of the inner core. Inner core Q is 130-52+255 between 140-340 km depth. The observations also provide constraints on the degree of homogeneous meridional anisotropy possibly present in the core, to between 0.1 and 0.6% velocity differences in the fast and slow directions, significantly smaller than the 2-4% axi-symmetric anisotropy in the inner core. The small meridional component to anisotropy argues against significant contributions to anisotropy from low-order inner core convection or stresses imposed on the inner core by the outer core field.
Helffrich George
Kaneshima Satoshi
Kendall J.-Michael
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