Results 31 to 40 of about 108 (94)

Geomagnetic and Archeomagnetic Jerks: Where Do We Stand? [PDF]

Eos, Transactions American Geophysical Union, 2009
The Earth's magnetic field is generated mainly by a self‐sustaining dynamo in the fluid outer core. Known as the core or main field, the dynamo's magnetic field is not constant but changes with time, a phenomenon denoted as secular variation. Unfortunately, no common agreement exists about the definition of secular variation: While some use this term ...
Mandea, M., Olsen, N.
openaire   +2 more sources

Bayesian Inference of Local Paleosecular Variation From Sparse Paleomagnetic Data

Journal of Geophysical Research: Solid Earth, Volume 131, Issue 2, February 2026.
Abstract We introduce a novel Bayesian method to construct local paleosecular variation (PSV) curves. By modeling the geomagnetic field as a Gaussian process, global models can be incorporated as informative prior distributions. Because we use Hamiltonian Monte‐Carlo methods, complex age distributions resulting for example from radiocarbon calibration ...
M. A. Schanner, R. Meyer, L. V. de Groot
wiley   +1 more source

Necessary Core‐Mantle Boundary Heat Flux Patterns for Recovering the Latitude of the South Atlantic Anomaly

Journal of Geophysical Research: Solid Earth, Volume 130, Issue 11, November 2025.
Abstract The present‐day geomagnetic field at Earth's surface is characterized by an anomalously weak region known as the South Atlantic Anomaly (SAA). Numerical dynamo simulations with an imposed outer boundary heat flux pattern inferred from lowermost mantle seismic anomalies reproduce well the longitude of the SAA, but the latitudes of the modeled ...
Filipe Terra‐Nova, Hagay Amit
wiley   +1 more source

Cracking the code of Earth's magnetic mysteries: ancient secrets unveiled by byzantine bricks reconfirmed by Mesopotamian ceramics

Proceedings (European Academy of Sciences and Arts)
The study of the magnetization of artifacts discovered at archaeological sites, such as ceramics or hearth remnants, is known as archaeomagnetism. This technique is based on the idea that some materials get magnetized in the direction and intensity of ...
Ioannis Liritzis
doaj   +1 more source

Rock magnetic characterization of archeological pottery and natural materials from the Kiya petroglyph site (Russia): an insight into post-burial alteration

Evolving Earth
While processes that lead to recording magnetic information in stone and ceramic artifacts have been extensively investigated, the preservation of archeomagnetic signal after the artifacts have been abandoned has received much less attention.
Alexandra Abrajevitch, Andrey S. Samynin
doaj   +1 more source

Geomagnetic Dipole Strength During the Cretaceous Normal Superchron Recorded by Baked Sediments From Hainan (SE Asia)

Geophysical Research Letters, Volume 52, Issue 17, 16 September 2025.
Abstract The Cretaceous Normal Superchron constitutes an enigmatic ∼37‐Myr interval of stable polarity in the history of the Earth's magnetic field. The strength of the geomagnetic dipole moment during this interval is controversial, with absolute paleointensity determinations on crystallized volcanic rocks, volcanic glasses, and silicate crystals ...
Yuchen Chi, Florian Lhuillier, Jun Meng, Chunyang Zhang, Valeriy P. Shcherbakov   +4 more
wiley   +1 more source

Tephra Deposits of the Tajogaite Volcano, La Palma: Changes of Magnetic Properties Through the 2021 Eruption

Geophysical Research Letters, Volume 52, Issue 15, 16 August 2025.
Abstract We report the results of a rockmagnetic study of tephra material produced by the Tajogaite volcano, in La Palma (Canary Islands), during 19 September through 13 December 2021. Our magnetic analysis reveals a change of rock magnetic properties through the eruption.
J. M. Parés, V. Soler, M. F. Bógalo, M. Calvo, A. Carrancho, E. Vernet   +5 more
wiley   +1 more source

A global archeomagnetic intensity data bank

Eos, Transactions American Geophysical Union, 1993
An up‐to‐date list of global archeomagnetic intensity (AI) data has been made [Lagios et al., 1992]. The data meet certain reliability criteria and the regional graphs produced were used to draw some geophysical conclusions.This compilation needed to be completed before new data was accumulated since existing models are tenaciously adhered to and can ...
L. Liritzis, E. Lagios
openaire   +1 more source

Assessing the Reliability of the Pseudo‐Thellier Estimates in Fired Ceramics and Source Clays

Journal of Geophysical Research: Solid Earth, Volume 130, Issue 7, July 2025.
Abstract The geomagnetic field's intensity is key to understanding the Earth's core dynamics and their surface impacts. While the Thellier–Thellier method remains the standard for recovering absolute paleointensity from baked materials, it is time‐consuming and may alter magnetic mineralogy due to heating cycles. The pseudo‐Thellier method offers a non‐
Wilbor Poletti, Mikaelly G. Rocha, Plínio Jaqueto, Gelvam A. Hartmann, Grasiane L. Mathias, Daniele Brandt, Ricardo I. F. Trindade, Paulo Maximiano   +7 more
wiley   +1 more source

Low Geomagnetic Field Intensity in Southern China 6,000 Years Ago

Geophysical Research Letters, Volume 52, Issue 9, 16 May 2025.
Abstract The West Pacific Anomaly (WPA), a low geomagnetic field anomaly observed in the 16th to 18th centuries, represents a recently recognized and complex feature of Earth's magnetic field. However, the history of the WPA is still uncertain due to a scarcity of paleointensity data in Southeast Asia.
Xin Luo, Jiabo Liu, Huapei Wang, Maximilian Schanner, Yuan Zhang, Peng Xie, Jigen Tang, Peng Han, Quan Li, Fei Han, Xiaowei Chen, Chen Wen, Wen Zhong, Yufan Hu, Qingsong Liu   +14 more
wiley   +1 more source