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tomography

Italy’s Mount Etna, snowcapped and beneath a sky of puffy white clouds.
Posted inResearch Spotlights

Improved Imaging Offers New Insight into Mount Etna

by Rebecca Owen 9 July 20249 July 2024

Anisotropic tomography provides a more complete picture of the Sicilian volcano’s inner workings.

Map of the Hawaiian islands with colors and contour lines overlain.
Posted inEditors' Highlights

A Strong Pacific Plate Bends Under the Hawaiian Volcanic Chain

by Emilie Hooft 14 March 202413 March 2024

Two seismic studies reveal the volcanic loads and resulting flexure of the Pacific plate at the Hawaiian Ridge and, surprisingly, show no magmatic underplating.

Diagram from the paper.
Posted inEditors' Highlights

Rift-to-Ridge: Mid-Atlantic Ridge Segments Imprinted During Rifting

by Emilie Hooft 19 October 202317 October 2023

A new seismic study shows that magmatism along the eastern North American rift margin was segmented, and that rift discontinuities influence formation of fracture zones along the Mid-Atlantic Ridge.

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 20224 August 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.

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