Abstract
Case studies of four multiplets (υs‐sensitive 1S7 and 1S8 and υp‐sensitive 5S5 and 5S6) are considered to test the accuracy of normal mode constraints on aspherical structure at degrees above 2 (4,6,8). Analyses of misfit, along‐branch consistency, and consistency with existing mantle models argue for the feasibility of constraints on higher structural degrees. Preliminary interpretation indicates a relative insensitivity of data misfits to dlnυp/dlnυs at degrees 6 and 8 in the lower mantle (perhaps due to inaccuracies in current δυs models), and provides weak evidence of some decorrelation between δυs and δυp in the middle and lower mantle.
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