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Earth’s core

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

Sarah Stanley, Science Writer 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 202027 January 2023

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

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 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.

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 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.

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.

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Features from AGU Journals

RESEARCH SPOTLIGHTS
Geophysical Research Letters
“Neural Networks Map the Ebb and Flow of Tiny Ponds”
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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