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Tomography

Two maps showing locations of seismic arrays.
Posted inEditors' Highlights

Can Anelastic Attenuation of Oceanic Mantle be Reliably Measured?

by Fan-Chi Lin 26 October 202227 January 2023

A new study demonstrates that robust anelastic attenuation measurements can be made across ocean bottom seismic arrays at different locations using surface wave array analysis.

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.

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.

Perspective plot looking west across the Hikurangi margin (New Zealand) at the 3 km/s S-velocity isosurface contoured in depth.
Posted inEditors' Highlights

Adjoint Tomography Illuminates Hikurangi Margin Complexity

by Michael Bostock 21 April 202227 January 2023

Waveform inversion of regional earthquakes reveals velocity anomalies interpreted as subducting seamounts that control an enigmatic segmentation in plate coupling along the Hikurangi margin.

Several charts showing the results of hydrothermal flow modelling along a 26 km-long line located on 7-million-year-old Atlantic oceanic crust.
Posted inEditors' Highlights

Mechanisms of Hydrothermal Ocean Plate Cooling Revealed

by V. Sallarès 28 September 202127 January 2023

A combination of waveform tomography and hydrothermal modelling allows characterizing the mechanisms and reach of fluid flux and ocean plate cooling near mid-ocean ridges with unprecedented detail.

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.

3D illustration showing the passive seismic signal recorded at two stations
Posted inEditors' Highlights

Revealing Complexity of Groundwater Flow with Hydrogeophysics

by A. Binley 29 April 202127 January 2023

A combination of passive seismic and electrical measurements are used to unravel the complex hydrogeology structure and associated groundwater flow paths at a coastal site in O’ahu, Hawai`i.

Xray tomograms taken at two times which show fractures and pores within solid rock.
Posted inEditors' Highlights

When Will the Next Failure Be?

by G. A. Prieto 5 March 202127 January 2023

Unprecedented images of fracture networks in laboratory scale experiments mixed with machine learning algorithms help predict the timing of the next failure.

Cutaway model of Earth’s interior
Posted inNews

Geologists to Shed Light on the Mantle with 3D Model

by E. Gribkoff 4 December 202027 January 2023

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

Jonny Wu (left) and Spencer Fuston point to a slide displaying mantle tomography in the North Pacific Ocean.
Posted inNews

The Resurrection Plate Is Dead, Long Live the Resurrection Plate

by Rachel Fritts 16 November 202027 January 2023

Using a technique similar to taking a CT scan of Earth, researchers found the possible remnants of a long-debated “missing” tectonic plate.

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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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