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Length scales of mantle heterogeneities from seismological perspective

Yingcai Zheng w/ input from Ru-shan Wu and Thorne Lay University of California, Santa Cruz. Length scales of mantle heterogeneities from seismological perspective. P(k). ? ? ?. Fine scale, ~1km. Large scale ~100s-1000s km. Small/medium scale ~10s km. k.

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Length scales of mantle heterogeneities from seismological perspective

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  1. Yingcai Zheng w/ input from Ru-shan Wu and Thorne Lay University of California, Santa Cruz Length scales of mantle heterogeneities from seismological perspective P(k) ? ? ? Fine scale, ~1km Large scale ~100s-1000s km Small/medium scale ~10s km k Seismic velocity heterogeneities: Scale issue

  2. logA(x) ϕ(x) Observational geometry: wavefront “distortion” of a teleseismic plane wave Chernov,1950; Tatarskii 1971); Aki (1973) and others; Flatte and Wu (1988); Zheng, Wu, Lay (2007), Zheng and Wu (2008). Incomplete …

  3. Contour line spacing is every 20 deg in epicentral distance

  4. Estimated slope is -2.56 for L-curve result in the shaded region

  5. Estimated slope is -1.28 for L-curve result in the shaded region

  6. Implications to CIDER inter-disciplinary investigation • Based on the seismic results: size and strength of the multiscale heterogeneities, likely to be compositional. • Assuming the origin of the heterogeneity,e.g., oceanic crust •  long-term evolution of the Earth’s interior: vol. of the subducted oceanic crust retained in the mantle; • layering of the heterogeneity and multiscale spectra of the heterogeneity (CONVECTION) •  mixing model of the mantle (PETRO) •  Compare with spectra of isotopic ratios along ocean ridges with seismic heterogeneity spectra (GEOCHEM)

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