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Título: Seasonal fluctuation in the mass of the Amazon River system and Earth's elastic response
Autor(es): Michael Bevis
Douglas Alsdorf
Eric Kendrick
Luiz Paulo Fortes
Bruce Forsberg
Robert Smalley Jr
Janet Becker
Bruce Rider Forsberg
Assunto: amazon
ISSN: 0094-8276
Revista: Geophysical Research Letters
Volume: 32
Resumo: A GPS station in Manaus, near the center of the Amazon basin, manifests an annual cycle of vertical displacement with a peak-to-peak amplitude of 50 - 75 mm. This is by far the largest crustal oscillation observed to date, and nearly 2 - 3 times larger than the amplitude predicted for this region. Vertical ground displacement is strongly anticorrelated with the local stage height of the Amazon river, with no detectable time lag between the two time series. This suggests that we are observing, for the first time, a purely elastic response to changes in the weight of a flowing river system. We use a simple hydrological model to relate stage height to the regional pattern of flooding, and argue that the elastic oscillations observed in Manaus are dominated by changes in water loading developed within similar to 200 km of the GPS station.
ISSN: 0094-8276
Aparece nas coleções:Coordenação de Dinâmica Ambiental (CDAM)

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