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Journal of Geophysical Research: Solid Earth

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A small coastal shipping town in Japan is devastated by an earthquake. In this photo taken from a plane, the wreckage of hundreds of buildings can be seen, and only a handful remain standing. In the center of the image, a small yacht is perched on top of one of the only remaining buildings. The town is surrounded by mountains and forests. One of the plane’s wheels is visible in the lower left corner of the image.
Posted inResearch Spotlights

Months of Gravity Changes Preceded the Tōhoku Earthquake

Sarah Derouin, Science Writer by Sarah Derouin 1 September 202225 October 2022

Using GRACE satellite data, researchers discovered anomalous gravimetric signals that occurred before a seismic event that started deep within Earth.

Graph from the paper.
Posted inEditors' Highlights

Magnetofossils Unveil Paleoredox Conditions in Extreme Climate

by Mark J. Dekkers 30 August 20229 November 2022

The Paleocene-Eocene Thermal Maximum, a thermal pulse about 56 million years ago, is an analog for future global warming. A new magnetofossil study shows progressive ocean deoxygenation.

A copper mine delves deep into the orange rock of an Arizona desert. More than a dozen even steps have been excavated leading down to a roughly circular depression in the ground. Some of the steps have patches of oxidized copper, a blue-green color. A smooth path large enough for heavy machinery spirals down into the bottom of the mine.
Posted inResearch Spotlights

Machine Learning Could Revolutionize Mineral Exploration

Aaron Sidder, freelance science writer by Aaron Sidder 26 August 202223 September 2022

Using a global data set of zircon trace elements, new research demonstrates the power of machine learning algorithms to accurately identify and locate porphyry copper deposits.

Two maps of the study region displaying earthquake depth as colored dots.
Posted inEditors' Highlights

Aftershocks Reveal Coseismic Rupture of Megathrust Earthquakes

by Agnes Helmstetter 28 July 202221 September 2022

More accurate aftershock zones reveal that the rupture areas of megathrust Aleutian–Alaska earthquakes are larger than we thought and partly overlap, in contradiction with the seismic gap hypothesis.

A map and 3 graphs showing the waveform fits for an earthquake.
Posted inEditors' Highlights

Western US Adjoint Tomography Reproduces Waveform Complexity

by Michael Bostock 22 July 202222 December 2022

Adjoint tomography employing 3D wavefield simulations for 72 well recorded regional earthquakes in the western U.S. yields spectacular improvements to waveform fits.

Four satellite images showing pyroclastic material infill between 2014 and 2019.
Posted inEditors' Highlights

Volcanic Creation and Destruction of Temporary Tephra Storage

by Agnes Kontny 1 July 20225 June 2023

Pyroclastic density currents (PDCs) are a major threat during an explosive volcanic eruption. A new study shows that loose tephra accumulations on volcanic slopes tend to re-mobilize rapidly.

Images showing the ArchKalmag14k model output for Paris (France) compared to other geomagnetic field models..
Posted inEditors' Highlights

Time-Step Filtering in Holocene Global Magnetic Field Models

by Mark J. Dekkers 9 June 20229 May 2023

Through a local fixed time-step filter, global Holocene magnetic field models remain mathematically tractable refining our insight into field variability and improving archeological dating.

Niveau du lac du Nyiragongo au cours du temps.
Posted inEditors' Highlights

Mesurer les oscillations d’un lac de lave depuis l’espace

by Michael Poland 19 May 202221 February 2023

Les images satellite permettent de mesurer les oscillations du lac de lave du Nyiragongo (RD Congo). Ces mesures renseignent sur la dynamique du volcan et aident à anticiper ses éruptions futures.

Lava lake activity over time at the Nyiragongo volcano.
Posted inEditors' Highlights

Tracking Lava Lake Levels at an African Volcano from Space

by Michael Poland 19 May 20222 August 2022

Satellite data from Nyiragongo Volcano, Democratic Republic of Congo, track changes in summit-crater lava levels that provide a window into eruption dynamics and aid in forecasting future activity.

Three-dimensional shear wave velocity maps.
Posted inEditors' Highlights

Probabilistic Tomography Delivers Answers to Basic Questions

by Michael Bostock 13 May 202227 January 2023

Fundamental questions on subsurface properties are robustly addressed through probabilistic assessment of multiple forward/inverse modelling formalisms using interrogation theory.

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