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Geochemistry, Geophysics, Geosystems

Four maps of the Red River region in different periods of geologic history showing composition of sediment samples
Posted inEditors' Highlights

A River Ran Through It

by Peter van der Beek 19 August 202026 January 2023

The history of river system in southeast Tibet and Indochina reconstructed using the ages of thousands of zircon sand grains in modern and ancient river sediments.

Cartoon showing a map view of the top of a subducting plate modeled on present day subduction at Nankai in southwest Japan
Posted inEditors' Highlights

A Mechanism for Shallow, Slow Earthquakes in Subduction Zones

by U. Faul 30 July 202018 January 2022

Slow earthquakes beneath the accretionary prism updip from the locked portion of a subduction zone can be caused by basaltic blocks embedded in a shale matrix.

World map showing distribution of SEAfloor FLuid Expulsion Anomalies (SEAFLEASs)
Posted inEditors' Highlights

A New Global Map of Seafloor Fluid Expulsion Anomalies

by Claudio Faccenna 20 April 202023 January 2023

The first open-source database of SEAfloor FLuid Expulsion Anomalies (SEAFLEASs) at a global scale reveals their distribution and physical parameters.

A mountainside exposing sedimentary rocks of the Fifteenmile Group in the Ogilvie Mountains, Yukon
Posted inResearch Spotlights

Review of Go-To Iron Analysis Method Reveals Its Pros and Cons

by David Shultz 27 March 202016 June 2022

Researchers validated some steps in the standard sequential chemical technique used to extract different forms of iron from rock samples but found inconsistencies in other steps.

The Bishop Tuff in California
Posted inResearch Spotlights

Paleomagnetism Indicators May Be Flawed

by Aaron Sidder 3 June 201927 January 2023

A new study finds that magnetism in volcanic ash tuff forms through varied processes, calling into question previously reliable signatures used to study variations in Earth’s magnetic field.

Layers of Permian marine sediments exposed on the southeast coast of Tasmania, Australia
Posted inResearch Spotlights

New Global Analysis Reveals Amount of Sediment on the Ocean Floor

by David Shultz 10 May 201929 June 2022

Researchers calculate that there are ~3.37 × 108 cubic kilometers of sediment on the world’s ocean floor.

Posted inEditors' Highlights

Follow The ‘Hum’: The Seismic Signal of Pacific Ocean Storms

by M. Long 27 March 2019

Have you ever noticed that the Earth is humming? Seismologists have! Discover how individual storms in the northern Pacific Ocean generate a long-period seismic signal.

A view of the Scottish Highlands, where a geologist first recognized Barrovian geological regional metamorphism.
Posted inResearch Spotlights

Regional Metamorphism Occurs Before Continents Collide

by Terri Cook 3 January 201911 January 2022

Evidence from collision zones suggests that the high temperatures that create regional zones of metamorphic minerals occur in wide, hot back arcs prior to continental collision deformation.

Posted inEditors' Highlights

Are Diamonds Ubiquitous Beneath Old Stable Continents?

by Sergei Lebedev 7 August 201823 December 2021

Although rare at the Earth’s surface, diamonds may be commonplace at depths of 120 to 150 kilometers below the surface within the lithosphere of old continents.

Researchers drill into New Zealand’s Alpine Fault to better understand fault structure and earthquake physics
Posted inResearch Spotlights

Drilling into a Future Earthquake

by A. Branscombe 26 February 20186 October 2021

Researchers drill into a fault that is anticipated to rupture in coming decades to study fault structure and earthquake physics.

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Features from AGU Journals

RESEARCH SPOTLIGHTS
JGR: Solid Earth
“New Tectonic Plate Model Could Improve Earthquake Risk Assessment”
By Morgan Rehnberg

EDITORS' HIGHLIGHTS
AGU Advances
“Eminently Complex – Climate Science and the 2021 Nobel Prize”
By Ana Barros

EDITORS' VOX
Perspectives of Earth and Space Scientists
“New Directions for Perspectives of Earth and Space Scientists”
By Michael Wysession


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