Constraining outermost core velocity with SmKS waves

Details Constraining outermost core velocity with SmKS waves Constraining outermost core velocity with SmKS waves

Nov 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993georl..20.2463g&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 20, no. 22, p. 2463-2466

Physics

18

P Waves, Propagation Velocity, S Waves, Seismic Waves, Wave Propagation, Core-Mantle Boundary, Earth Core, Earth Mantle, Seismology

Scientific paper

SmKS waves (m = 2,3,4), seismic waves that travel as S-waves in the mantle, P-waves in the core, and reflect (m - 1) times on the underside of the core-mantle boundary (CMB), are well-suited for constraining outermost core V(sub P) structure. This is due to closeness of the mantle paths and also the shallow depth range these waves travel in the outermost core. High quality digitized World Wide Standardized Seismograph Network (WWSSN) and Canadian network recordings from a deep focus Java Sea event which sample the outer core beneath the northern Pacific, the Arctic, and northwestern North America (roughly 1/8 of the globe), are utilized as an example to show the strength of SmKS waves to resolve outermost core structure. S3KS-S2KS and S4KS-S3KS differential travel times were measured and compared to those from reflectivity synthetics created from core models of past studies. Constraints and uncertainties in outer core structure using SmKS are discussed. For the event studied, the Preliminary Reference Earth Model (PREM) core model, with possibly a small V(sub P) decrease in the outermost 50 km of the core, provides a good fit to the data.

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