TY  - JOUR
AU  - Cao A, Romanowicz B.
PY  - 2009//
TI  - Constraints on shear wave attenuation in the Earth's inner core from an observation of PKJKP
JO  - Geophysical Research Letters
SP  - L09301-
VL  - 36
IS  - 9
KW  - inner core
KW  - shear wave
KW  - quality factor
KW  - 3909 Elasticity and anelasticity
KW  - 5144 Wave attenuation
KW  - 7207 Core
KW  - 7203 Body waves
KW  - 8115 Core processes
KW  -
N2  - Based on the high quality broadband data from Gräfenberg array in Germany, we recently detected a reliable PKJKP phase, for which four kinds of evidence (travel time, slowness, back-azimuth, and comparison with a pseudo-liquid inner core model) were simultaneously provided. Also, for the first time, a clear waveform of PKJKP was observed. This gives us an unprecedented opportunity to put constraints on the shear wave attenuation in the earth's inner core using body waves. In order to minimize the potential influence of dispersion and phase shift caused by mantle heterogeneity, we adopt an envelope modeling approach. Our results show that the estimated Q from the shear phase PKJKP is significantly larger (315 ± 150) than that from normal mode observations. Because PKJKP samples the deep inner core, this indicates an increase of Q with depth in the inner core, in agreement with what is generally observed for Q.
SN  - 1944-8007
UR  - http://dx.doi.org/10.1029/2009GL038342
N1  - exported from refbase (http://publi.ipev.fr/polar_references/show.php?record=99), last updated on Tue, 09 Jul 2024 02:00:05 +0200
ID  - CaoA2009
ER  -