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- W2944562199 abstract "Abstract Previous seismological studies have focused on the large‐scale heterogeneity of the D″ layer beneath East Asia. Here, we use high‐frequency PcP precursors recorded at dense networks in China and Japan to constrain the small‐scale heterogeneity in this region. By forward modeling of the stacks of recorded PcP precursory signal, we find that the small‐scale heterogeneity in the D″ layer beneath East Asia is characterized by a P wave velocity perturbation of 0.1‐0.2% and a dominant length scale of 4‐20 km. Although the resolved length scale is similar to the dimension of the subducted oceanic crust, the weak velocity perturbation is difficult to explain by basaltic rock in the lowermost mantle. Postperovskite transition of the supposed slab might also not be viable for generating weak heterogeneity; thus, new explanations are needed from geodynamics and mineral physics to account for the different strength of the large‐ and small‐scale heterogeneity." @default.
- W2944562199 created "2019-05-16" @default.
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- W2944562199 date "2019-05-28" @default.
- W2944562199 modified "2023-10-12" @default.
- W2944562199 title "Seismological Constraints on the Small‐Scale Heterogeneity in the Lowermost Mantle Beneath East Asia and Implication for Its Mineralogical Origin" @default.
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- W2944562199 doi "https://doi.org/10.1029/2019gl082296" @default.
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