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The feasibility of normal mode constraints on higher degree structures
Author(s) -
Ritzwoller Michael H.,
Resovsky Joseph S.
Publication year - 1995
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/95gl02231
Subject(s) - decorrelation , mantle (geology) , consistency (knowledge bases) , geology , geodesy , mathematics , geophysics , physics , statistics , geometry
Case studies of four multiplets (υ s ‐sensitive 1 S 7 and 1 S 8 and υ p ‐sensitive 5 S 5 and 5 S 6 ) 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 dlnυ p /dlnυ s at degrees 6 and 8 in the lower mantle (perhaps due to inaccuracies in current δυ s models), and provides weak evidence of some decorrelation between δυ s and δυ p in the middle and lower mantle.