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Earth’s interior

World map showing location of permanent geomagnetic observatories and their data availability for electromagnetic source characterization.
Posted inEditors' Highlights

Globally Variable Water Content in the Mantle Transition Zone

by S. D. Jacobsen 9 June 202022 September 2022

Using electromagnetic waves originating in the ionosphere and magnetosphere, conductivity profiles reaching the deep upper mantle show surprising variability in water content.

The M/V Fugro Equator searches the seafloor for MH370
Posted inNews

Search for MH370 Revealed Ocean Crust Waves

by Kimberly M. S. Cartier 8 June 202029 September 2021

Efforts to recover the missing airplane produced high-resolution bathymetry of the southern Indian Ocean that raises new ideas about how ocean crust forms.

Model of the Nazca slab constrained by continent-scale tomography
Posted inEditors' Highlights

The Other, Deeper, South American Flat Slab

by V. Lekic 6 June 202023 January 2023

Tomographers trace the slab subducting beneath South America into the lower mantle, providing the most complete picture of structure beneath the continent to date.

Graphic showing ray-path sampling of Earth by the body-wave constituents of the seismic-event coda-correlation
Posted inEditors' Highlights

Earthquake-coda Tomography Boosts Illumination of the Deep Earth

by Andreas Fichtner 28 May 202027 January 2023

A new tomographic method based on correlations of seemingly chaotic earthquake coda waves yields otherwise unobservable arrivals, thus greatly improving illumination of the deep Earth.

The hyperacidic lake inside the crater of Poás volcano in Costa Rica
Posted inScience Updates

Microbial Influences on Subduction Zone Carbon Cycling

by D. Giovannelli, P. H. Barry, J. M. de Moor, K. G. Lloyd and M. O. Schrenk 3 March 202024 October 2022

An innovative collaboration is investigating how geobiological processes alter fluxes of carbon and other materials between the deep Earth and the surface.

The Nile River flows through the metropolis of Cairo, Egypt.
Posted inNews

The Eternal Nile Is Even More Ancient Than We Thought

by Mary Caperton Morton 27 December 201911 January 2022

Deep-mantle flow helps maintain the river’s steady course.

A landscape of dark volcanic rocks forefronts a beautiful blue ocean.
Posted inNews

Leaky at the Core

by Jon Kelvey 23 September 201920 April 2022

New evidence from deep mantle plumes suggests that Earth’s liquid outer core might be leaking tungsten isotopes into the lower mantle.

Structure of hydrous eutectic silicate melts at different temperatures and pressures
Posted inEditors' Highlights

Hiding Deep Hydrous Melts at the Core-Mantle Boundary

by S. D. Jacobsen 13 September 201922 December 2021

Silicate melts containing H2O in the lowermost mantle are surprisingly dense and may stagnate there, trapping primordial volatiles and potentially causing some of the ultra-low velocity zones.

Graph showing the possible melting curve of hydrogen-bearing iron peroxide
Posted inEditors' Highlights

The Lower Mantle May Have a Wet Bottom

by S. W. Parman 6 August 201912 October 2021

Molecular dynamics calculations suggest that molten hydrogen-bearing iron peroxide (FeO2Hx) may produce the ultra-low velocity zones that occur at the core-mantle boundary.

Portrait of a smiling white woman in the woods
Posted inNews

Louise H. Kellogg (1959–2019)

by B. Romanowicz and M. Billen 27 June 201910 November 2021

Louise Kellogg, an influential solid Earth geodynamicist and leader of the geoscience community, passed away in April.

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EDITORS' VOX
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