Constraints on uppermost inner core structure by waveform inversion of core phases

Details Constraints on uppermost inner core structure by waveform inversion of core phases Constraints on uppermost inner core structure by waveform inversion of core phases

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufm.s52h..09g&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #S52H-09

Physics

3260 Inverse Theory, 7203 Body Wave Propagation, 7207 Core And Mantle, 8147 Planetary Interiors (5430, 5724), 8180 Tomography

Scientific paper

The determination of the inner core boundary structure is a key for understanding the mechanisms of inner core growth, iron solidification and anisotropy formation in the inner core. A waveform inversion of a worldwide data set of PKIKP and PKiKP core phases, in the epicentral distance range 128o-136o, is performed to investigate velocity and attenuation structure of this region. Different inversion procedures are developed and tested in time and frequency domains. Synthetic tests allow us to estimate the resolution of velocity and attenuation parameters computed by these non-linear inversions. The average attenuation γ of P-waves in the top 50 km of inner core is found to be high (γ =(1)/(Q) ~0.01). The velocity structure presents a hemispherical pattern with low velocities in the Western hemisphere and high velocities in a large part of the Eastern hemishere. The results of the inversion procedure do not favour the presence of axisymmetric anisotropy in the uppermost inner core. However, the hemispherical pattern of the velocity variations is correlated with the large scale variations of the inner core anisotropy previously determined in the deeper inner core, 100 km beneath the inner core boundary. >http://www.obs- mip.fr/umr5562/labo/personnels/defaut_perso.html

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