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Earth’s core

Illustration of the Earth's internal structure.
Posted inEditors' Vox

Digging Deep into Interactions Between the Core and Mantle

by Takashi Nakagawa, Taku Tsuchiya, Madhusoodhan Satish-Kumar and George Helffrich 24 July 20234 August 2023

A new book presents major advances in our understanding of core-mantle interaction and co-evolution, and showcases technological developments improving our insights into deep Earth processes.

Una ilustración mostrando a la Tierra en el espacio con una sección que deja ver sus capas internas en colores rojos y naranjas brillantes.
Posted inResearch Spotlights

El hierro está en el centro de este debate de las ciencias de la Tierra

Aaron Sidder, freelance science writer by Aaron Sidder 6 April 20236 April 2023

Un nuevo estudio investiga el estado del hierro en el interior del planeta. Los hallazgos tienen repercusiones para comprender la estructura del núcleo interno.

An illustration showing a cross section of Earth
Posted inResearch Spotlights

Iron Is at the Core of This Earth Science Debate

Aaron Sidder, freelance science writer by Aaron Sidder 10 March 20236 April 2023

A new study investigates iron’s form at the planet’s interior. The findings have repercussions for understanding the inner core’s structure.

Photo of a rock outcrop
Posted inEditors' Vox

The Seven-Ages of Earth as Seen Through the Continental Lens

by Peter A. Cawood and Priyadarshi Chowdhury 24 February 20236 March 2023

The 4.5-billion-year record contained in Earth’s continental crust reveals a seven-phase evolution, from an initial magma ocean to the present-day environment in which we live.

Photograph of an outcrop of the North American Midcontinent Rift showing dark gray rocks enclosing a light-colored rock—the target sample in this study. In the foreground stands coauthor Nick Swanson-Hysell, amid green grasses along the base of the cliff.
Posted inNews

Swinging Strength of Earth’s Magnetic Field Could Signal Inner Core Formation

by Alka Tripathy-Lang 22 August 202230 September 2022

The magnetic record stored in rocks documents the liquid core’s behavior and possibly when the inner core formed. Whether it formed half a billion or more than a billion years ago, however, is up for debate.

Artistic rendition of Earth with a section removed, exposing yellow, orange, and red layers
Posted inNews

Earth’s Wobbly Inner Core Illuminated by Nuclear Explosions

by Jennifer Schmidt 21 July 20221 August 2022

Shock waves from Cold War era nuclear tests gave seismologists a glimpse of the inner core. Its wobbly rotation could explain phenomena such as the periodic change in the length of a day.

A red rock tower in front of a backdrop of cloudy sky
Posted inFeatures

Is Earth’s Core Rusting?

by Jiuhua Chen and Shanece S. Esdaille 25 April 20223 January 2023

If subduction carries hydrous minerals deep into Earth’s mantle, they may “rust” the iron outer core, forming vast sinks of oxygen that can later be returned to the atmosphere.

A back-scattered electron image of an experimental charge showing a miniaturized model of the core-mantle boundary equilibrated at pressure-temperature conditions thought to prevail during core formation.
Posted inEditors' Highlights

New Results Deepen the Mystery of Earth’s Early Magnetic Field

by Carolina Lithgow-Bertelloni 14 April 202214 March 2023

How was Earth’s early magnetic field produced? New experimental results and modeling show that the energy source could not have come from exsolution of lithophile elements from the core.

Figure 2 from Wang and Tkalčić [2021]
Posted inEditors' Highlights

Observation of Shear Wave Anisotropy in the Earth’s Inner Core

by Daoyuan Sun 5 January 202220 April 2022

Coda-correlation wavefields reveal direction-dependent inner-core shear-wave speed, ~5 s faster in directions oblique to the Earth’s rotation axis than directions parallel to the equatorial plane.

Concept art of the Gravity Recovery and Climate Experiment (GRACE) satellite
Posted inNews

Can NASA’s Gravity Satellites Detect Motions in Earth’s Core?

by Megan Kalomiris 15 December 202120 April 2022

Measurements of our planet’s gravitational field could expose processes in the fluid outer core—if scientists can decipher the signals.

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Features from AGU Journals

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By Sarah Derouin

EDITORS' HIGHLIGHTS
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“Collaboration Helps Overcome Challenges in Air Quality Monitoring”
By Muki Haklay

EDITORS' VOX
Reviews of Geophysics
“What We Know and Don’t Know About Climate Tipping Elements”
By Seaver Wang

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