New constraints on the structure of the inner core from P'P'

Details New constraints on the structure of the inner core from P'P' New constraints on the structure of the inner core from P'P'

Sep 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000georl..27.2781b&link_type=abstract

Geophysical Research Letters, Volume 27, Issue 17, p. 2781-2784

Physics

5

Seismology, Seismology: Body Wave Propagation, Seismology: Core And Mantle

Scientific paper

We measured absolute P'P'df as well as differential P'P'bc-P'P'df and P'P'ab-P'P'df travel time residuals for earthquakes in Alaska and the Aleutians recorded at NORSAR array (Norway). For such paths, P'P'df samples two regions of the inner core which have been identified as strongly anisotropic (~3.5%), respectively beneath the Central Pacific and Africa, and should arrive some ~6s earlier than predicted by a standard model. Absolute and differential travel times do not appear to be anomalous. A very complex texture and/or heterogeneity of the top ~400 km of the inner core, or a significant contribution from the strongly heterogeneous D'', is required to explain this discrepancy.

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