Results 11 to 20 of about 99 (72)

Paleointensity Study on the Holocene Surface Lavas on the Island of Hawaii Using the Tsunakawa–Shaw Method [PDF]

Frontiers in Earth Science, 2018
Investigating volcanic paleointensity during the Holocene is important for linking archeointensity and sedimentary paleointensity. Across the globe, the island of Hawaii is one of the most studied subaerial locations.
Yuhji Yamamoto, Ryo Yamaoka
doaj   +3 more sources

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., E, Zaburlín, M.A., A, Basso, D.M., M, Pavon-Carrasco, F.J., Osete, Maria Luisa, Campuzano, S. A.   +7 more
openaire   +4 more sources

First archeointensity results from Portuguese potteries (1550-1750 AD) [PDF]

Earth, Planets and Space, 2009
Abstract Geomagnetic field variations at archeomagnetic timescales can be obtained from well-dated heated structures and archeological potsherds. Here, we present the first archeointensity results obtained on Portuguese ceramics (1550 to 1750 AD) collected at Brazilian archeological sites.
Hartmann, Gelvam A., Trindade, Ricardo I. F., Goguitchaichvili, Avto, Etchevarne, Carlos, Morales, Juan, Afonso, Marisa C.   +5 more
openaire   +1 more source

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

Updated Iberian Archeomagnetic Catalogue: New Full Vector Paleosecular Variation Curve for the Last Three Millennia

Geochemistry, Geophysics, Geosystems, 2018
In this work, we present 16 directional and 27 intensity high‐quality values from Iberia. Moreover, we have updated the Iberian archeomagnetic catalogue published more than 10 years ago with a considerable increase in the database.
A. Molina‐Cardín, S. A. Campuzano, M. L. Osete, M. Rivero‐Montero, F. J. Pavón‐Carrasco, A. Palencia‐Ortas, F. Martín‐Hernández, M. Gómez‐Paccard, A. Chauvin, S. Guerrero‐Suárez, J. C. Pérez‐Fuentes, G. McIntosh, G. Catanzariti, J. C. Sastre Blanco, J. Larrazabal, V. M. Fernández Martínez, J. R. Álvarez Sanchís, J. Rodríguez‐Hernández, I. Martín Viso, D. Garcia i Rubert   +19 more
doaj   +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

A comprehensive paleomagnetic study from the last Plinian eruptions of Popocatepetl volcano: absolute chronology of lavas and estimation of emplacement temperatures of PDCs

Earth, Planets and Space, 2019
Three lava flows (Buenavista, Xalitzintla and Nealtican) and pyroclastic density currents (Lorenzo and Pink Pumice) from two Popocatepetl Plinian eruptions were sampled for paleomagnetic dating.
Nayeli Pérez-Rodríguez, Juan Morales, Avto Goguitchaichvili, Felipe García-Tenorio   +3 more
doaj   +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

Analyzing the geomagnetic axial dipole field moment over the historical period from new archeointensity results at Bukhara (Uzbekistan, Central Asia)

Physics of the Earth and Planetary Interiors, 2021
Abstract Since the mid-19th century, direct measurements of both intensity and directions of the Earth's magnetic field have been available, allowing an accurate determination of its spatio-temporal variations. Prior to this time, between ∼1600 and 1840, only direct directional measurements are available.
Troyano, Marie, Gallet, Yves, Genevey, Agnès, Pavlov, Vladimir, Fournier, Alexandre, Lagroix, France, Niyazova, Makhsuma, Mirzaakhmedov, Dzhamal   +7 more
openaire   +1 more source