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. 2017 Aug 2;8:177. doi: 10.1038/s41467-017-00219-x

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© The Author(s) 2017

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 4 — Time evolution of the location and morphology of ultradense material patches. a–c Composition field (represented by effective buoyancy ratio) at 5 km above the CMB showing locations of ultradense material (reddish) and pile material (greenish). The yellowish color shows a mixing of ultradense material with pile material. The cyan arrows show mantle flow velocity. U1, U2, U3, and U4 are markers that track the patches of ultradense material, as explained in the text. Light gray color represents Earth’s core