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olivine

Mantle-derived peridotite xenolith from San Carlos, Arizona, showing green olivine crystals.
Posted inScience Updates

Understanding Electrical Signals from Below Earth’s Surface

by A. Pommier and J. Roberts 19 November 20189 March 2023

A new version of a free Web application (SIGMELTS 2.0) helps Earth scientists interpret electrical anomalies in Earth’s crust and mantle and track the sources of earthquakes and volcanic eruptions.

Harry Green II
Posted inNews

Harry W. Green II (1940–2017)

by P. C. Burnley, W.-P. Chen, L. F. Dobrzhinetskaya, Z.-M. Jin, H. Jung, R. Liebermann, M. Martins-Green, Alexandre Schubnel, Y. Wang and J. Zhang 2 May 201822 September 2022

By keenly probing mantle rheology, interactions of deformations and phase transitions, and microscopic features, he made major contributions to petrology, mineralogy, and earthquake science.

Secondary electron microscope images showing microstructures of stressed grains.
Posted inResearch Spotlights

Probing the Grain-Scale Processes That Drive Plate Tectonics

by Terri Cook 8 December 201722 September 2022

New experimental data suggest that rock composition may play a critical role in forming and perpetuating shear zones.

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