Heterogeneity and anisotropy of seismic attenuation in the inner core

Details Heterogeneity and anisotropy of seismic attenuation in the inner core Heterogeneity and anisotropy of seismic attenuation in the inner core

Jan 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3102613o&link_type=abstract

Geophysical Research Letters, Volume 31, Issue 2, CiteID L02613

Physics

6

Physical Properties Of Rocks: Wave Attenuation, Seismology: Body Wave Propagation, Seismology: Core And Mantle

Scientific paper

We evaluate seismic attenuation in the inner core from the spectral ratio between the seismic phase PKP(DF) and either PKP(AB) or PKP(BC) at the epicentral distances from 150° to 170°. The global data set is divided into two groups according to the position of the turning point of PKP(DF) either in the eastern (from 50°E to 120°W) or the western hemisphere. In the eastern hemisphere the parameter t* shows strong dependence on the epicentral distance and no dependence on the angle between the Earth's spin axis and PKP(DF) ray at the turning point. In the western hemisphere t* is weakly dependent on the distance, and varies between approximately 0.7 s and 0.1 s for the angles between 0° and 90°, respectively. Our results allow us to reconcile seemingly incompatible results of many previous studies. The anisotropy of attenuation is correlated with the anisotropy of P velocity.

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