Low P-wave velocity at the base of the mantle

Edward Garnero, S. P. Grand, D. V. Helmberger

Research output: Contribution to journalArticle

62 Citations (Scopus)

Abstract

A tool for investigating P-wave (Vp) structure at the base of the mantle is presented. The difference time between SKS and SPd KS most strongly depends on Vp at the base of the mantle near SKS core entrance and exit points. Digitized long-period (5-15s) observations from deep focus Tonga events exhibit anomalously large SPdKS-SKS difference times. SKS and the later arriving SPdKS are separated by several seconds more than predictions made by the global average PREM model. Models having a pronounced low-velocity zone in Vp at the base of the mantle best predict the observations. -from Authors

Original languageEnglish (US)
Pages (from-to)1843-1846
Number of pages4
JournalGeophysical Research Letters
Volume20
Issue number17
StatePublished - 1993
Externally publishedYes

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P waves
P-wave
wave velocity
Earth mantle
mantle
low velocity zone
entrances
low speed
prediction
predictions

ASJC Scopus subject areas

  • Earth and Planetary Sciences (miscellaneous)

Cite this

Garnero, E., Grand, S. P., & Helmberger, D. V. (1993). Low P-wave velocity at the base of the mantle. Geophysical Research Letters, 20(17), 1843-1846.

Low P-wave velocity at the base of the mantle. / Garnero, Edward; Grand, S. P.; Helmberger, D. V.

In: Geophysical Research Letters, Vol. 20, No. 17, 1993, p. 1843-1846.

Research output: Contribution to journalArticle

Garnero, E, Grand, SP & Helmberger, DV 1993, 'Low P-wave velocity at the base of the mantle', Geophysical Research Letters, vol. 20, no. 17, pp. 1843-1846.
Garnero, Edward ; Grand, S. P. ; Helmberger, D. V. / Low P-wave velocity at the base of the mantle. In: Geophysical Research Letters. 1993 ; Vol. 20, No. 17. pp. 1843-1846.
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