Q measurements for Phase X overtones

Emile A. Okal; Bong Gon Jo

doi:10.1007/BF00874369

Q measurements for Phase X overtones

Emile A. Okal^*, Bong Gon Jo

^*Corresponding author for this work

Earth and Planetary Sciences

Research output: Contribution to journal › Article › peer-review

20 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 (Q_μ=75-90), low attenuation in the intermediate mantle (670-1500 km); (Q_μ≈350), and lower values in the deeper mantle (Q_μ≈200).

Original language	English (US)
Pages (from-to)	331-362
Number of pages	32
Journal	Pure and Applied Geophysics PAGEOPH
Volume	132
Issue number	1-2
DOIs	https://doi.org/10.1007/BF00874369
State	Published - Mar 1 1990

Keywords

Mantle attenuation
spheroidal overtones

ASJC Scopus subject areas

Geophysics
Geochemistry and Petrology

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10.1007/BF00874369

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title = "Q measurements for Phase X overtones",

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).",

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TY - JOUR

T1 - Q measurements for Phase X overtones

AU - Okal, Emile A.

AU - Jo, Bong Gon

PY - 1990/3/1

Y1 - 1990/3/1

N2 - 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).

AB - 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).

KW - Mantle attenuation

KW - spheroidal overtones

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Q measurements for Phase X overtones

Abstract

Keywords

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