Q measurements for PhaseX overtones |
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| Authors: | Emile A Okal Bong-Gon Jo |
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| Institution: | (1) Department of Geological Sciences, Northwestern University, 60201 Evanston, Illinois, USA;(2) Present address: Department of Geology and Geophysics, Yale University, 06511 New Haven, Connecticut, USA;(3) Department of Geology, Jeonbug National University, 520 Jeonju, Jeonbug, Republic of Korea |
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| 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  PhaseX 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 modeQ'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
 =75–90), low attenuation in the intermediate mantle (670–1500 km); (Q
 350), and lower values in the deeper mantle (Q
200). |
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| Keywords: | Mantle attenuation spheroidal overtones |
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