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Reassessment of a reported S‐delay under Trindade
Author(s) -
Nataf H. C.,
Lay T.,
Anderson D. L.,
Okal E. A.
Publication year - 1981
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/gl008i010p01027
Subject(s) - geology , residual , mantle (geology) , hotspot (geology) , geodesy , geophysics , algorithm , computer science
We present a correction to a paper by Okal and Anderson (1975) about multiple ScS travel‐time anomalies. We have reanalyzed data for ScS 2 surface bounces in the South Atlantic Ocean. From these data an ScS 2 ‐S residual of 23.6 seconds was found by Okal and Anderson (1975). This corresponded to an ScS 2 surface bounce point under Trindade island and was inferred to be due to very slow upper mantle associated with the Trindade hot spot. The analysis we present here invalidates this conclusion. The nature of the upper mantle under Trindade is an open issue.