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Title: Seasonal fluctuations in the mass of the Amazon River system and Earth's elastic response
Authors: Bevis, Michael G.
Alsdorf, Douglas E.
Kendrick, Eric C.
Fortes, Luiz Paulo Souto
Forsberg, Bruce Rider
Smalley, Robert F.
Becker, Janet M.
Keywords: Floods
Mathematical Models
Structural Geology
Time Series Analysis
Crustal Oscillation
Elastic Oscillations
Hydrological Model
Seasonal Fluctuations
Vertical Displacement
Crustal Movement
River Basin
Vertical Movement
Amazon River
South America
Western Hemisphere
Issue Date: 2005
metadata.dc.publisher.journal: Geophysical Research Letters
metadata.dc.relation.ispartof: Volume 32, Número 16, Pags. 1-4
Abstract: 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 ∼200 km of the GPS station. Copyright 2005 by the American Geophysical Union.
metadata.dc.identifier.doi: 10.1029/2005GL023491
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