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Earth’s core

A green laser beam streams between two parts of a cylindrical instrument.
Posted inFeatures

Earth’s Core Is in the Hot Seat

Jenessa Duncombe, Staff Writer by Jenessa Duncombe 24 June 202019 August 2022

How old is Earth’s inner core? High-pressure and high-temperature experiments suggest that our planet’s inner furnace may be much younger than expected.

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.

A graph showing total conductive heat flow in the core as a function of radius for pure iron (black line) and compositional models containing Fe-Ni-S (blue line) and Fe-Ni-Si (red line)
Posted inEditors' Highlights

Thermal Convection Can Power the Geodynamo

by S. D. Jacobsen 4 November 201910 March 2022

New high-pressure experiments on fluid iron suggest thermal convection without compositional buoyancy is sufficient to drive the dynamo generating Earth’s magnetic field.

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

Leaky at the Core

Jon Kelvey, Science Writer by Jon Kelvey 23 September 20194 August 2023

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

Map of southern California showing relationship between observed foreshock prevalence and magnitude of completeness
Posted inEditors' Highlights

Most Southern California Mainshocks Follow Foreshocks

by G. P. Hayes 19 September 20196 October 2021

New research using a highly complete earthquake catalog shows that 72% of M4+ mainshocks are preceded by foreshocks, implying that foreshock activity is much more prevalent than previously thought.

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 20194 August 2023

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 20194 August 2023

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.

A computer simulation’s rendering of the interior of the Earth’s core showing magnetic field lines being stretched by turbulent convection.
Posted inNews

New Model Shines Spotlight on Geomagnetic Jerks

Mary Caperton Morton, Science Writer by Mary Caperton Morton 29 April 201920 December 2021

Scientists get one step closer to being able to predict jerks—notoriously capricious changes to Earth’s geomagnetic field detectable by satellites.

Modern continents mapped onto Pangaea.
Posted inNews

Paleomagnetic Data Hint at Link from Earth’s Core to Continents

Bas den Hond, Science Writer by Bas den Hond 15 June 20177 October 2021

Earth’s magnetic field waxes and wanes as supercontinents form and break up, suggests a new study postulating a direct connection between our planet’s crust and its core.

How Earth precesses and nutates gives clues to interior processes.
Posted inScience Updates

Earth's Wobbly Path Gives Clues to Its Core

by V. Dehant and R. Gross 11 April 20178 April 2022

Understanding the Earth Core and Nutation; Brussels, Belgium, 19–21 September 2016

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Coupled Isotopes Reveal Sedimentary Sources of Rare Metal Granites

17 June 202516 June 2025
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Inside Volcanic Clouds: Where Tephra Goes and Why It Matters

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