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Creators/Authors contains: "Bai, Ling"

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  1. ; ; ; (, ThinkMind Digital Library)
    Accepted Manuscript Full Text Available
  2. ; ; ; ; ; (, Advanced Functional Materials)
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  3. ; ; ; ; ; ; ; ; ; (, Genome Biology)
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  4. ; ; (, Geophysical Research Letters)
    Abstract Seismic tomography has demonstrated that the shear‐wave velocity is relatively high over a 3,000‐km wide region in the lowermost mantle beneath southern and eastern Asia. This seismic anomaly demarcates the current position of slab remnants that may have subducted in the Cretaceous. To further characterize the seismic structure at smaller scales, we measure 929 residual travel time differences (δt) between the phasesScSandSusing recordings of eight earthquakes beneath the Indian Ocean at stations from the Chinese Digital Seismic Network. We interpret variations of δtup to 10 s as due to horizontal shear‐velocity variations in D″ beneath northern India, Nepal, and southwestern China. The shear velocity can vary by as much as 7% over distances shorter than 300 km. Our observations provide additional observational evidence that compositional heterogeneity and possibly melt contribute to the seismic structure of the lower mantle characterized by long‐term subduction and mantle downwelling. 
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