Synthetic seismograms for an inner core transition of finite thickness

Details Synthetic seismograms for an inner core transition of finite thickness Synthetic seismograms for an inner core transition of finite thickness

Jul 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988geoj...94...21c&link_type=abstract

Geophysical Journal (ISSN 0952-4592), vol. 94, July 1988, p. 21-34. Research supported by Lawrence Livermore National Laboratory

Physics

14

Earth Core, Earth Planetary Structure, Seismograms, Wave Reflection, Asymptotic Methods, Earthquakes, Green'S Functions, Invariant Imbeddings, Seismic Waves

Scientific paper

Calculations for short-period body waves that interact with an inner-outer core transition of finite thickness are described. This involves development of a hybrid full wave-reflectivity algorithm which is used to calculate synthetic seismograms for earth models with various transition thicknesses. The numerical results indicate that the frequency content of reflected short-period PKiKP waveforms observed at distances less than 40 deg is very sensitive to the thickness of the transition zone. Comparison with published data in this distance range indicates that the inner-core transition must be less than 5 km thick. In the distance range 60-90 deg effective decoupling of short-period PKiKP and PKJKP is achieved for transition zones as thin as 3 km, resulting in substantial distortion of the PKiKP waveform. PKIKP + PKiKP waveforms in the distance range 120-130 deg are not as sensitive to the detailed properties of the transition, but the signal quality is good enough to constrain the transition thickness to be less than 10 km.

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