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Eos

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Science News by AGU

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Mark J. Dekkers

Editor, JGR: Solid Earth

Inspecting mine drainage in a river
Posted inEditors' Vox

Using Hematite to Decipher Past Climates and Environments

by Zhaoxia Jiang, Qingsong Liu, Andrew Roberts, Mark J. Dekkers, Vidal Barrón, José Torrent and Sanzhong Li 7 February 202220 April 2022

The magnetic and color properties of the mineral hematite give clues to past environmental conditions and is being used for paleoclimatic reconstruction.

A compilation of high-quality paleointensity determinations from dated archeological sites in Uzbekistan from 600 BC to 600 AD.
Posted inEditors' Highlights

An Unstable Magnetic Field in Central Asia 2500-1500 Years Ago

by Mark J. Dekkers 8 December 202119 January 2022

The geomagnetic field intensity – poorly described – varies spatially and temporally on centennial time scales. A recent study fills an important gap in Central Asia and discusses global implications.

Map centered on the North Pole plotting archived data from multiple sources.
Posted inEditors' Highlights

American Legacy Paleosecular Variation Data Unlocked

by Mark J. Dekkers 3 December 202120 December 2021

The geomagnetic field changes regionally on centennial time scales. A recent study unlocks three historical archives from the “Four Corners” region (southwest USA) reconciling previous discrepancies.

Plot showing a compilation the virtual dipole moment of the geomagnetic field during the Ediacaran and Cambrian periods.
Posted inEditors' Highlights

A Dipole Field from the Ediacaran-Cambrian Transition Onward?

by Mark J. Dekkers 14 October 20218 October 2021

The Ediacaran features an instable magnetic field complicating paleogeographic reconstructions; a new paleointensity study on late Ediacaran rocks indicates a weak but stable dipolar field.

A series of panels showing the substantial number of new quality data published for the three geomagnetic elements, declination (left), inclination (center), and intensity (right) with geographical distribution on the top row and temporal distribution on the bottom row.
Posted inEditors' Highlights

New Spherical Cap Field Model for Europe and Direct Environs

by Mark J. Dekkers 14 May 202128 September 2021

New data on ancient burnt structures is integrated into a superior spherical cap field model for Europe.

Five plots showing the paleosecular variation of the geomagnetic field in the composite record from Black Sea cores.
Posted inEditors' Highlights

Marine Isotope Stage 6: First High-Resolution Field Record

by Mark J. Dekkers 12 May 202128 September 2021

A 200-year resolution record from the Black Sea for marine isotope stage 6 (130-180 ka) shows a stable geomagnetic field.

Map of magnetic anomaly field intensity in the study area in the Pacific Ocean
Posted inEditors' Highlights

Probing the Age of the Oldest Ocean Crust in the Pacific

by Mark J. Dekkers 5 April 202120 December 2021

A new study extends the calibration of the Mesozoic Sequence down to the Mid Jurassic with multiscale marine magnetic anomaly data, demonstrating extraordinarily high reversal frequency.

Photograph of pseudotachylytes, also known as “earthquake fossils”, from Santa Rosa, California
Posted inEditors' Vox

New Insights from the Magnetic Properties of Fault Rocks

by Mark J. Dekkers, E. C. Ferré, Y.-M. Chou, T. Yang, J. Chen, E.-C. Yeh and W. Tanikawa 13 November 20206 October 2021

Magnetic studies offer a new strand for the analysis of faulting processes and could help with better understanding of fault rupture and earthquakes.

Example of the convolutional neural network (CNN) approach from an area in the Black Hill norite
Posted inEditors' Highlights

Machine Learning for Magnetics

by Mark J. Dekkers 21 October 202020 December 2021

Classic interpretation of aeromagnetic anomaly maps involves several steps with limiting boundary conditions; a recent study develops convolutional networks largely bypassing these issues.

Plot showing two known endmembers fitted with several magnetic components
Posted inEditors' Highlights

Unmixing Magnetic Components – An Experimental Twist

by Mark J. Dekkers 19 October 202021 October 2021

Various unmixing approaches are used in environmental magnetism, each starting from a different premise; now they are put to the test by scrutinizing experimental mixtures of known endmembers.

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