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Earth’s interior

Kominato Beach and Kopepe Beach, part of the Ogasawara Islands located in Japan
Posted inResearch Spotlights

First Report of Seismicity That Initiated in the Lower Mantle

by Jack Lee 19 August 20214 August 2023

A 4D back-projection method revealed that aftershocks of the 2015 earthquake beneath the Ogasawara (Bonin) Islands occurred as deep as about 750 kilometers.

A photo of Agung volcano
Posted inNews

Lava from Bali Volcanoes Offers Window into Earth’s Mantle

Jon Kelvey, Science Writer by Jon Kelvey 13 August 20214 August 2023

Lava from the Agung and Batur volcanoes provides a near-pristine picture of Earth’s mantle and raises questions about all volcanoes along the Indonesian Sunda Arc and beyond.

Diagram showing high velocity slabs in the lower mantle beneath South America's present position and profile showing the westward motion of South America.
Posted inEditors' Highlights

Previous Intra-oceanic Subduction Found Beneath South America?

by M. Assumpção 9 July 202127 January 2023

Newly mapped fast velocity slabs in the lower mantle may be remnants of westward dipping intra-oceanic subduction, before flipping to the present eastward subduction beneath South America at 85 Ma.

Basalt columns at Giant’s Causeway in Northern Ireland
Posted inScience Updates

Seafloor Seismometers Look for Clues to North Atlantic Volcanism

by Sergei Lebedev, R. Bonadio, M. Tsekhmistrenko, J. I. de Laat and C. J. Bean 8 June 20212 March 2023

Did the mantle plume that fuels Iceland’s volcanoes today cause eruptions in Ireland and Great Britain long ago? A new project investigates, while also inspiring students and recording whale songs.

Posted inAGU News

Peter M. Shearer Receives 2020 Inge Lehmann Medal

by AGU 24 May 202128 October 2021

Peter M. Shearer was awarded the 2020 Inge Lehmann Medal at the virtual AGU Fall Meeting in December. The medal is for “contributions to the understanding of the structure, composition, and dynamics of the Earth’s mantle and core.”

A model bulk water storage capacity map of the pyrolitic mantle up to 27 GPa
Posted inEditors' Highlights

Watering Down the Mantle

by V. Salters 9 March 20214 August 2023

The cooling of planet Earth over time increased the water carrying capacity of the mantle and could have shrunk the oceans.

Map view of the topography of Central America and surrounding ocean basins
Posted inResearch Spotlights

Subduction May Recycle Less Water Than Thought

Sarah Stanley, Science Writer by Sarah Stanley 12 February 202127 January 2023

A new analysis of seismic data from the Middle America Trench suggests that previous calculations have vastly overestimated the total amount of water transported to the mantle worldwide.

A graphic in space showing Earth’s magnetic field lines with the sun in the background.
Posted inAGU News

The Wobbly Anomaly and Other Magnetic Weirdness

Heather Goss, AGU Publisher by Heather Goss 21 December 202030 September 2021

From the connection between Earth’s core and life on the surface, way out to the ends of the solar system, this month’s issue of Eos takes a look at the study of magnetic fields.

A visualization of Earth and its magnetic field
Posted inFeatures

The Herky-Jerky Weirdness of Earth’s Magnetic Field

Jenessa Duncombe, Staff Writer by Jenessa Duncombe 21 December 20203 November 2021

Dented, erratic, and wandering, our field is constantly changing its mind.

Cutaway model of Earth’s interior
Posted inNews

Geologists to Shed Light on the Mantle with 3D Model

by E. Gribkoff 4 December 20204 August 2023

The model, which will incorporate 227 million surface wave measurements, could help with everything from earthquake characterization to neutrino geosciences.

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Features from AGU Publications

Research Spotlights

Tracing Black Carbon’s Journey to the Ocean

11 July 202510 July 2025
Editors' Highlights

The Power of Naming Space Weather Events

10 July 20258 July 2025
Editors' Vox

Water Tracks: The Veins of Thawing Landscapes

25 June 202525 June 2025
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