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Earth’s interior

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.

Image of the diamond from Botswana containing davemaoite as an inclusion
Posted inNews

Diamond Discovery Unearths Secrets of the Deep

by Clarissa Wright 23 December 20219 May 2023

A diamond inclusion has revealed a new mineral, davemaoite, as well as hints about the workings of our planet’s interior.

Painting depicting the surface of Earth during the Hadean eon, with a liquid water ocean, volcanoes, and meteors streaking through the sky
Posted inScience Updates

A Simple Recipe for Making the First Continental Crust

by Anastassia Y. Borisova and Anne Nédélec 5 November 202116 May 2022

Laboratory experiments serendipitously revealed a rock-forming process that might explain how the first continental crust formed on Earth—and possibly on Mars.

Image of a synchrotron X-ray diffraction image collected in a high-pressure/-temperature diamond-anvil cell experiment to determine the deformation behavior of ferropericlase
Posted inEditors' Vox

Processes in Earth’s Mantle and Surface Connections

by H. Marquardt, M. Ballmer, S. Cottaar and J. Konter 24 September 202119 November 2021

A new AGU book presents a multidisciplinary perspective on the dynamic processes occurring in Earth’s mantle.

Two world maps with colored dots and stars denoting maximum mantle temperatures retrieved by the RevPET algorithm for the basaltic melts from the global submarine mid-ocean ridge system.
Posted inEditors' Highlights

A Novel Thermobarometer to Infer Mantle Melting Conditions

by Susanne Straub 16 September 202110 November 2021

The algorithm RevPET automatically reverses the complex multi-phase fractional crystallization path of oceanic basalts and offers new perspectives for advancing mantle thermobarometry.

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 202129 September 2021

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 20212 May 2022

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.”

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