Q measurements for Phase X overtones

Emile A. Okal*, Bong Gon Jo

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

19 Scopus citations

Abstract

Linear stacking procedures are used to retrieve the attenuation of 91 modes belonging to the 3rd, 4th and 5th Rayleigh overtones branches in the 80-160 s period range, and contributing to the so-called "Phase X" wave group. Our data show in general slightly less attenuation than expected from available models. Data space inversion shows that, when combined with previously measured fundamental mode Q's, this new dataset improves resolution significantly in the 1000-2000 km depth range. Based on this remark, we carry out a number of parameter space inversions. Our results suggest a narrow (80-200 km) zone of high attenuation (Qμ=75-90), low attenuation in the intermediate mantle (670-1500 km); (Qμ≈350), and lower values in the deeper mantle (Qμ≈200).

Original languageEnglish (US)
Pages (from-to)331-362
Number of pages32
JournalPure and Applied Geophysics PAGEOPH
Volume132
Issue number1-2
DOIs
StatePublished - Mar 1 1990

Keywords

  • Mantle attenuation
  • spheroidal overtones

ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology

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