Seismological in situ estimation of density jumps across the transition zone discontinuities beneath Japan

Details Seismological in situ estimation of density jumps across the transition zone discontinuities beneath Japan Seismological in situ estimation of density jumps across the transition zone discontinuities beneath Japan

Jul 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001georl..28.2541k&link_type=abstract

Geophysical Research Letters, Volume 28, Issue 13, p. 2541-2544

Physics

3

Seismology: Body Wave Propagation, Seismology: Core And Mantle, Seismology: Lithosphere And Upper Mantle, Tectonophysics: Earth'S Interior-Composition And State

Scientific paper

We investigate the magnitude of shear-wave velocity and density jumps across the 410-km and 660-km discontinuities in the Earth's mantle. We estimate SS reflection and PS conversion coefficients from ScS reverberations and receiver-side P-S converted phases, respectively, using broadband seismograms recorded at stations in western Japan. Fractional changes of model parameters that satisfy our observations in the northwest Pacific are (ΔVs,Δρ)=(8.5%,5.4%) for the 660-km discontinuity, and (4.9%, 1.9%) for the 410-km discontinuity.

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