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f LONG PERIOD COMPONENTS OF GEOMAGNETIC ELEMENTS AT HUANCAYO, VASSOURAS AND PILAR
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 1st International Congress of the Brazilian Geophysical Society, Nov 1989, cp-317-00148
Abstract
In South America three observatories has continuous long time series of annual mean values of gecmagnetic elements: Huancayo, Vassouras and Pilar. Its regional geotectonic characteristics are quite differents. While Huancayo is on the subduction zone of Nazca plate, Pilar is located south of the more sulxiucted zone of such plate with hypocenters ranging from 600 Km to 750 Km depth and, Vassouras is on the brasilean craton. Previous studies has determined that the earth magnetic field variations with periods greater than 4 yr. could be an internal origin meanwhile waves of solar periodicity could be inductive phenomena.