Coupled normal-mode sensitivity to inner-core shear velocity and attenuation

Details Coupled normal-mode sensitivity to inner-core shear velocity and attenuation Coupled normal-mode sensitivity to inner-core shear velocity and attenuation

Oct 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006geoji.167..204a&link_type=abstract

Geophysical Journal International, Volume 167, Issue 1, pp. 204-212.

Astronomy and Astrophysics

Astronomy

10

Attenuation, Inner Core, Mode Coupling, Normal Modes

Scientific paper

We have studied the response of normal modes to perturbations in inner-core shear velocity and attenuation, using fully coupled mode synthetics. Our results indicate that (i) mode pairs nSl-n+/-1Sl are strongly coupled by anelasticity, (ii) this coupling causes shear velocity perturbations to strongly affect the Q values of modes through exchange of inner-core characteristics, (iii) there is no evidence for a weakly attenuating inner core in shear, and (iv) the discrepancy between attenuation models returned from normal modes and body waves is small. These results suggest that inversions for inner-core attenuation and shear velocity should be performed simultaneously and should take account of the strong cross-coupling due to attenuation.

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