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Strong, Multi-Scale Heterogeneity in Earth's Lowermost Mantle.

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Scientists reveal complex, multi-scale mantle heterogeneity near Earth's core. This finding provides a clearer picture of the lowermost mantle and its interactions with the outer core, impacting our understanding of geodynamics.

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Area of Science:

  • Geophysics
  • Seismology
  • Earth Sciences

Background:

  • The core mantle boundary (CMB) is a critical interface between Earth's liquid outer core and solid mantle.
  • This region exhibits complex thermal, compositional, and phase heterogeneity, including partial melt and seismic variations.
  • Understanding CMB structure is vital for comprehending mantle evolution and core-mantle interactions.

Purpose of the Study:

  • To analyze the heterogeneity spectrum of the lowermost mantle using advanced seismic tomography.
  • To provide a more complete characterization of the region within ~300 km of the CMB.
  • To bridge the gap between global S-wave models and seismic scatterer dimensions.

Main Methods:

  • Utilized a P-wave tomographic model derived from trans-dimensional and hierarchical Bayesian imaging.
  • Employed a tomographic technique that bypasses explicit parameterization, smoothing, and damping.
  • Conducted spectral analyses to investigate the wavelength content and power of heterogeneity.

Main Results:

  • Revealed a multi-scale wavelength content in mantle heterogeneity.
  • Quantified heterogeneity power three times larger than previously estimated.
  • Presented evidence for strong, multi-scale heterogeneity in the lowermost mantle.

Conclusions:

  • The study offers a more complete picture of the lowermost mantle's structure.
  • Findings bridge the gap between long-wavelength global models and short-scale seismic scatterers.
  • Strong multi-scale heterogeneity has significant implications for lower mantle dynamics and geodynamo boundary conditions.