Results 111 to 120 of about 181 (155)
The Cretaceous superchron geodynamo: observations near the tangent cylinder. [PDF]
Proc Natl Acad Sci U S A, 2002 Tarduno JA, Cottrell RD, Smirnov AV.
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Paleosecular variation of lavas from the Marianas in the Western Pacific Ocean.
Journal of geomagnetism and geoelectricity, 1975 openaire +2 more sources
Magnetostratigraphic resolution of the late Ediacaran paleomagnetic enigma
Pierce J +13 more
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Paleosecular variations from lake sediments
Reviews of Geophysics, 1979We have known since at least the 16th century that the Earth's magnetic field varies with time as well as geographic position. This secular variation (SV), which has been monitored instrumentally at various locations since that time, is fundamentally important to a complete understanding of the geomagnetic field and its origin.
S. P. Lund, S. K. Banerjee
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Shape analysis of paleosecular variation data
Journal of Geophysical Research, 1974Shape analysis of paleosecular variation (PSV) data, if it is properly used, can determine the statistical character of a PSV data set in many cases. Existing statistical techniques, such as the χ2 goodness of fit test, the ‘dipole moment,’ and eigenvalue methods, are reviewed with this point in mind.
Czang-Go Baag, C. E. Helsley
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Anisotropic paleosecular variation models: implications for geomagnetic field observables
Physics of the Earth and Planetary Interiors, 1999Abstract We present a family of statistical models for paleosecular variation (PSV) of the geomagnetic field that are compatible with paleodirectional and paleointensity variations in lava flows sampling the last 5 Ma, and explore what paleomagnetic observables might be used to discriminate among the various family members. We distinguish statistical
Catherine Johnson, Catherine Constable
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Model of geomagnetic paleosecular variations for the Northern Hemisphere
Studia Geophysica et Geodaetica, 1991A model of radial drifting and oscillating dipoles to represent geomagnetic palaeosecular variations, which showed to be appropriate for the Southern Hemisphere, is evaluated for the Northern Hemisphere. After a new fitting of some involved parameters, its theoretical results are compared with the palaeomagnetic data of Lake de Bouchet (France) and the
Ana M. Sinito, Juan F. Vilas
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Paleosecular variation of field intensities and dipole moments
Earth and Planetary Science Letters, 1996Abstract In order to use paleointensity data for paleosecular variation studies, we first obtain analytical for the intensity of the geomagnetic field and the corresponding dipole moment in terms of Gauss coefficients. Next, statistical parameters for these quantities are derived under the assumption that Gauss coefficients vary randomly with time ...
Masaru Kono, Osamu Hiroi
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Dipole/quadrupole family modeling of paleosecular variation
Journal of Geophysical Research: Solid Earth, 1988Contrary to previous claims that the VGP scatter and its latitude variation deduced from the present field are atypical of those for the past 5 m.y., it is shown that it is in fact typical when correctly calculated. A simple and effective model for the paleosecular variation of lavas is developed by using this important observation together with the ...
P. L. McFadden +2 more
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Geomagnetic paleosecular variation in Easter Island, the southeast Pacific
Physics of the Earth and Planetary Interiors, 1998Abstract We collected more than 250 samples from 45 sites in lava flows of the three volcanoes on Easter Island. The K–Ar whole rock dating was attempted on 13 sites. All of the ages obtained are younger than 0.8 Ma. Reliable paleomagnetic directions were obtained from 34 sites.
Masako Miki +6 more
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