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Q Measurements for Phase X Overtones
OKAL, EMILE A.,JO, BONG-GON 全北大學校 基礎科學硏究所 1991 基礎科學 Vol.14 No.2
Abstract-Linear stacking procedures are used to retrieve the attenuation of 91 modes belonging to the 3rd, 4th and 5th Rayleight 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 ㎞ depth range. Based on this remark, we carry out a number of parameter space inversions. Our results suggest a narrow (80-200㎞) zone of high attenuation (Q = 75-90), low attenuation in the intermediate mantle(670-1500㎞) (Q_u ? 350), and lower values in the deeper mantle(Q_μ?200).