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Showing 1–14 of 14 results
Advanced filters: Author: Barbara Romanowicz Clear advanced filters

  • These authors show that changes in seismic anisotropy with depth across the stable part of North America reveal the presence of two lithospheric layers. The top layer, which is chemically depleted, is ∼150 km thick under the ancient core of the continent and tapers out along its younger borders. The bottom of the lithosphere is relatively flat, in agreement with the presence of a thermal conductive root that subsequently formed around the depleted chemical layer.

    • Huaiyu Yuan
    • Barbara Romanowicz
    Research
    Nature
    Volume: 466, P: 1063-1068

  • Analysis of helium isotope ratios in volcanic hotspot lavas suggests that hotter, more buoyant plumes upwelling from the deep mantle entrain high-3He/4He material, unlike cooler, less buoyant plumes, implying the existence of a dense, relatively undisturbed primordial reservoir in the deep mantle.

    • M. G. Jackson
    • J. G. Konter
    • T.W. Becker
    Research
    Nature
    Volume: 542, P: 340-343

  • A whole-mantle seismic imaging technique, combining accurate wavefield computations with information contained in whole seismic waveforms, is used to reveal the presence of broad conduits beneath many of Earth’s surface hotspots, supporting the idea that these conduits are the source of hotspot volcanoes.

    • Scott W. French
    • Barbara Romanowicz
    Research
    Nature
    Volume: 525, P: 95-99

  • Evidence for the presence of two layers of anisotropy with different orientations in the North American upper mantle is presented. At asthenospheric depths, the fast axis is sub-parallel to the plate motion, confirming the presence of shear related to current tectonic processes, whereas within the lithosphere, the orientation is significantly different, indicating that anisotropy at these shallower depths was 'frozen-in' long ago.

    • Federica Marone
    • Barbara Romanowicz
    Research
    Nature
    Volume: 447, P: 198-201

  • Seismic waves generated in Earth's interior provide images that help us to better understand the pattern of mantle convection that drives plate motions.

    • Barbara Romanowicz
    Special Features
    Nature
    Volume: 451, P: 266-268

  • The inner core underwent preferential equatorial growth and translation after nucleation ~0.5–1.5 billion years ago, according to an analysis of its seismic anisotropy and self-consistent geodynamic simulations.

    • Daniel A. Frost
    • Marine Lasbleis
    • Barbara Romanowicz
    Research
    Nature Geoscience
    Volume: 14, P: 531-535

  • Strong anisotropy within the source region of deep earthquakes explains their apparent non-pure shear faulting mechanism.

    • Barbara Romanowicz
    News & Views
    Nature Geoscience
    Volume: 11, P: 622-624

  • The physical nature of two regions called large low-shear-velocity provinces at the base of Earth's mantle is uncertain. A measurement of their density has implications for our understanding of mantle dynamics. See Article p.321

    • Barbara Romanowicz
    News & Views
    Nature
    Volume: 551, P: 308-309

  • Mantle plumes are an integral aspect of Earth’s convection system, yet, difficulty in imaging mantle upwellings led to controversies surrounding their origin, dynamics and composition. This Review synthesizes geophysical, geodynamic and geochemical constraints on mantle plumes and their importance in the Earth system.

    • Anthony A. P. Koppers
    • Thorsten W. Becker
    • Joanne M. Whittaker
    Reviews
    Nature Reviews Earth & Environment
    Volume: 2, P: 382-401