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Earth’s core

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 20227 April 2022

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.

Posted inResearch Spotlights

长期海平面变化周期影响未来海平面上升预测

by Sarah Stanley 26 October 202126 October 2021

新的研究证实,海平面存在有规律的、长期的波动,这可能是由地核的活动引起的。

The Bayside Picnic Area on Assateague Island National Seashore after Hurricane Sandy
Posted inResearch Spotlights

Long-Term Sea Level Cycle Affects Predictions of Future Rise

by Sarah Stanley 27 September 202126 October 2021

New research confirms the existence of a regular, long-term fluctuation in sea level, perhaps caused by processes in Earth’s core.

Satellite image of Earth focused on the Arctic
Posted inNews

How Geodynamo Models Churn the Outer Core

by Alka Tripathy-Lang 16 February 20214 October 2021

New simulations of Earth’s outer core have reproduced magnetic fields that—for the first time—match paleomagnetic data collected from rocks.

A researcher looks closely at a rocky cliff near the shoreline on Saint Helena.
Posted inNews

A Robust Proxy for Geomagnetic Reversal Rates in Deep Time

by Alka Tripathy-Lang 14 December 20203 November 2021

The strength of Earth’s magnetic field in the distant past can tell scientists whether the planet’s magnetic poles were steady or prone to frequent reversals.

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

Earth’s Core Is in the Hot Seat

by Jenessa Duncombe 24 June 202022 November 2021

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 20202 March 2022

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.

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