Results 21 to 30 of about 235 (87)

The cooling‐rate effect on microwave archeointensity estimates [PDF]

Geophysical Research Letters, 2013
AbstractNew microwave (MW) paleointensity data on historical bricks from Northeast Brazil presented a bias toward higher fields when compared to previous cooling‐rate corrected double‐heating paleointensity estimates; the same relates to the previously reported values for pottery from Southwestern Pacific islands. A simple theoretical approach suggests
Wilbor Poletti, Gelvam A. Hartmann, Mimi J. Hill, Andrew J. Biggin, Ricardo I. F. Trindade   +4 more
openaire   +1 more source

New archeointensity data from NW Argentina (1300–1500 CE) [PDF]

Physics of the Earth and Planetary Interiors, 2019
A good characterization of the geomagnetic field strength at centennial to millennial time scales in the Southern Hemisphere is particularly crucial to disentangle the long-term evolution of the South Atlantic Anomaly (SAA), an intriguing geomagnetic feature currently observed at the Earth’s surface.
Gomez-Paccard, Miriam, Chauvin, Annick, Albeck, M.E., Zaburlín, M.A., Basso, D.M., Pavon-Carrasco, F.J., Osete, Maria Luisa, Campuzano, S. A.   +7 more
openaire   +4 more sources

Magnetic properties and archeointensity determination on Pre-Columbian pottery from Chiapas, Mesoamerica [PDF]

Earth, Planets and Space, 2009
Abstract As part of the effort to establish an archeointensity variation curve for Mesoamerica, 13 archeologically well-identified pottery samples belonging to the Ocozocoautla site (Chiapas) were studied. Analyzed samples consist of ‘ofrenda type’ pottery fragments found in several caves. Three archeological intervals are involved: 450-100 B.
Morales, Juan, Goguitchaichvili, Avto, Acosta, Guillermo, González-Moran, Tomas, Alva-Valdivia, Luis, Robles-Camacho, Jasinto, del Sol Hernández-Bernal, Ma.   +6 more
openaire   +1 more source

One Hundred Thousand Years of Geomagnetic Field Evolution

Reviews of Geophysics, Volume 57, Issue 4, Page 1289-1337, December 2019., 2019
Abstract Paleomagnetic records from sediments, archeological artifacts, and lava flows provide the foundation for studying geomagnetic field changes over 0–100 ka. Late Quaternary time‐varying spherical harmonic models for 0–100 ka produce a global view used to evaluate new data records, study the paleomagnetic secular variation on centennial to ...
S. Panovska, M. Korte, C. G. Constable
wiley   +1 more source

New Archeomagnetic Directional Records From Iron Age Southern Africa (ca. 425–1550 CE) and Implications for the South Atlantic Anomaly

Geophysical Research Letters, Volume 45, Issue 3, Page 1361-1369, 16 February 2018., 2018
Abstract The paucity of Southern Hemisphere archeomagnetic data limits the resolution of paleosecular variation models. At the same time, important changes in the modern and historical field, including the recent dipole decay, appear to originate in this region.
Vincent J. Hare, John A. Tarduno, Thomas Huffman, Michael Watkeys, Phenyo C. Thebe, Munyaradzi Manyanga, Richard K. Bono, Rory D. Cottrell   +7 more
wiley   +1 more source

Archeointensity study on baked clay samples taken from the reconstructed ancient kiln: implication for validity of the Tsunakawa-Shaw paleointensity method [PDF]

Earth, Planets and Space, 2015
In 1972, a reconstruction experiment of a kiln had been done to reproduce an excavated kiln of the seventh century in Japan. Baked clay samples were taken from the floor surface and −20 cm level, and they have been stored after determinations of the paleomagnetic directions by partial alternating field demagnetizations.
Yamamoto, Yuhji, Torii, Masayuki, Natsuhara, Nobuyoshi   +2 more
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

First Full‐Vector Archeomagnetic Data From Central Asia (3 BCE to 15 CE Centuries): Evidence for a Large Non‐Dipole Field Contribution Around the First Century BCE

Journal of Geophysical Research: Solid Earth, Volume 129, Issue 2, February 2024.
Abstract Unraveling the short‐term behavior of the Earth's past geomagnetic field at regional scales is crucial for understanding its global behavior and, thus, the dynamics of the deep Earth. In this context, obtaining accurate full‐vector geomagnetic field records from regions where archeomagnetic data are absent becomes essential.
R. Bonilla‐Alba, M. Gómez‐Paccard, F. J. Pavón‐Carrasco, S. A. Campuzano, E. Beamud, V. Martínez‐Ferreras, J. M. Gurt‐Esparraguera, E. Ariño‐Gil, F. Martín‐Hernández, M. L. Osete   +9 more
wiley   +1 more source

La céramique bistre fine des ve-vie siècles et les origines du centre potier de Sevrey (Saône-et-Loire)

Revue Archéologique de l’Est
A 2019 archaeological survey in the north-east of the village of Sevrey revealed vestiges of pottery workshops in use from the end of the 5th century to the beginning of the 6th.
Anne Ahü-Delor, Céline Brun, Florent Delencre, Agnès Genevey, Antoine Guicheteau, Valérie Thirion-Merle   +5 more
doaj   +1 more source

Tracing the geomagnetic field intensity variations in Upper Mesopotamia during the Pottery Neolithic to improve ceramic-based chronologies [PDF]

, 2021
The transdimensional Bayesian method AH-RJMCMC applied to archeomagnetic intensity data available in the Balkans and the Near East allows us to estimate the variations in intensity of the geomagnetic field in Upper Mesopotamia during the 7th and 6th ...
Gallet, Y, Fournier, A, Fournier, A., Livermore, PW, Livermore, P.W., W, Gallet, Y.   +5 more
core   +1 more source