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Abstract:

The causes of the systematic decay of the Earth's Magnetic Field strength since eighteen century have been a matter of debate during the last decade. It is also well known that such variations may have completely different expressions under an area characterized with strong magnetic anomalies, such as the South Atlantic Magnetic Anomaly. To fully understand these atypical phenomena, it is crucial to retrieve the past evolution of Earth's magnetic field beyond the observatory records. We report on detailed rock-magnetic and archeointensity investigations from some well-studied historical buildings of Buenos Aires city, located at the heart of the South Atlantic Magnetic Anomaly. Samples consist of bricks, tiles, fireplaces and pottery, which are considered as highly suitable materials for archaeointensity studies. The dating is ascertained by historical documents complemented by archeological constraints. Eighteen out of 26 analyzed samples yield reliable absolute intensity determinations. The site-mean archaeointensity values obtained in this study range from 28.5 to 43.5μT, with corresponding virtual axial dipole moments (VADMs) ranging from 5.3 to 8.04×1022Am2. Most determinations obtained in the present study are in remarkable agreement with the values predicted by the time varying field model CALS10k.1b (Korte et al., 2011). For the older periods the recently available SHA.DIF.14 model (Pavon-Carrasco et al., 2014) seems to have greater resolution.South American archaeointensity database now includes absolute intensities from 400 to 1930 AD based on 63 selected archaeointensity determinations. The data set reveals several distinct periods of quite large fluctuations of intensity. However, most data are concentrated into a relatively narrow interval from AD 1250 to AD 1450. At the beginning of the record, values between 400 AD and 830 AD match well with ARCH3k.1 model. Some general features may be detected: the time intervals from about AD 400 to 950 and 1150 to 1280 are characterized by a quite monotonic decrease of geomagnetic intensity, while some increase is observed from AD 950 to AD 1250. In contrast, a systematic intensity decay is detected from 1550 to 1930 in excellent agreement with the model prediction. No firm evidence of correlation between the climate changes over multi-decadal time scales and geomagnetic intensity was found for South America. © 2015 Elsevier B.V.

Registro:

Documento: Artículo
Título:Variation of the Earth's magnetic field strength in South America during the last two millennia: New results from historical buildings of Buenos Aires and re-evaluation of regional data
Autor:Goguitchaichvili, A.; Morales, J.; Schavelzon, D.; Vásquez, C.; Gogorza, C.S.G.; Loponte, D.; Rapalini, A.
Filiación:Instituto de Geofísica, Universidad Nacional Autónoma de México, Unidad Michoacán, Laboratorio Interinstitucional de Magnetismo Natural, Campus Morelia, Mexico
Centro de Arqueología Urbana, Universidad de Buenos Aires, Argentina
Universidad de Buenos Aires - CBC, Buenos Aires, Argentina
Centro de Investigaciones en Física e Ingenieria del Centro de la Provincia de Buenos Aires, (CIFICEN-CONICET), Tandil, Argentina
Instituto Nacional de Antropología y Pensamiento Latinoamericano, CONICET, Argentina
IGEBA - Universidad de Buenos Aires-IGEBA, Buenos Aires, Argentina
Palabras clave:Archaeomagnetism; Argentina; Buenos Aires; Earth's magnetic field; Secular variation; South America; Building materials; Climate change; Geomagnetism; Lithology; Magnetic fields; Microwave measurement; Archaeomagnetism; Argentina; Buenos Aires; Earth's magnetic field; Secular variation; South America; Magnetism; archaeology; historic building; magnetic anomaly; magnetic field; magnetic intensity; paleomagnetism; secular variation; Argentina; Buenos Aires [Argentina]
Año:2015
Volumen:245
Página de inicio:15
Página de fin:25
DOI: http://dx.doi.org/10.1016/j.pepi.2015.05.006
Título revista:Physics of the Earth and Planetary Interiors
Título revista abreviado:Phys. Earth Planet. Inter.
ISSN:00319201
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00319201_v245_n_p15_Goguitchaichvili

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Citas:

---------- APA ----------
Goguitchaichvili, A., Morales, J., Schavelzon, D., Vásquez, C., Gogorza, C.S.G., Loponte, D. & Rapalini, A. (2015) . Variation of the Earth's magnetic field strength in South America during the last two millennia: New results from historical buildings of Buenos Aires and re-evaluation of regional data. Physics of the Earth and Planetary Interiors, 245, 15-25.
http://dx.doi.org/10.1016/j.pepi.2015.05.006
---------- CHICAGO ----------
Goguitchaichvili, A., Morales, J., Schavelzon, D., Vásquez, C., Gogorza, C.S.G., Loponte, D., et al. "Variation of the Earth's magnetic field strength in South America during the last two millennia: New results from historical buildings of Buenos Aires and re-evaluation of regional data" . Physics of the Earth and Planetary Interiors 245 (2015) : 15-25.
http://dx.doi.org/10.1016/j.pepi.2015.05.006
---------- MLA ----------
Goguitchaichvili, A., Morales, J., Schavelzon, D., Vásquez, C., Gogorza, C.S.G., Loponte, D., et al. "Variation of the Earth's magnetic field strength in South America during the last two millennia: New results from historical buildings of Buenos Aires and re-evaluation of regional data" . Physics of the Earth and Planetary Interiors, vol. 245, 2015, pp. 15-25.
http://dx.doi.org/10.1016/j.pepi.2015.05.006
---------- VANCOUVER ----------
Goguitchaichvili, A., Morales, J., Schavelzon, D., Vásquez, C., Gogorza, C.S.G., Loponte, D., et al. Variation of the Earth's magnetic field strength in South America during the last two millennia: New results from historical buildings of Buenos Aires and re-evaluation of regional data. Phys. Earth Planet. Inter. 2015;245:15-25.
http://dx.doi.org/10.1016/j.pepi.2015.05.006