Length scales of mantle heterogeneities from seismological perspective

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Presentation transcript:

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

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

Contour line spacing is every 20 deg in epicentral distance

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

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

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)