Reference : Crustal displacements due to continental water loading
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Earth sciences & physical geography
Physical, chemical, mathematical & earth Sciences : Physics
Crustal displacements due to continental water loading
van Dam, Tonie mailto [Luxembourg National Museum of National History and the European Center for Geodynamics and Seismology]
Wahr, J. [Department of Physics and CIRES, University of Colorado, USA]
Milly, P. C. D. [U.S. Geological Survey, Princeton, New Jersey + Geophysical Fluid Dynamics Laboratory/NOAA, Princeton, New Jersey]
Shmakin, A. B. [Geophysical Fluid Dynamics Laboratory/NOAA, Princeton, New Jersey]
Blewitt, Geoffrey [Nevada Bureau of Mines and Geology, Reno, Nevada + Seismological Laboratory, University of Nevada, Reno]
Lavallee, D. [Department of Geomatics, University of Newcastle uponTyne, England]
Larson, K. [Department of Aerospace Engineering, University of Colorado, Boulder, Colorado]
Geophysical Research Letters
American Geophysical Union
Yes (verified by ORBilu)
[en] Geodesy ; environmental mass loading ; GPS
[en] The effects of long-wavelength (>100 km), seasonal variability in continental water storage on vertical crustal motions are assessed. The modeled vertical displacements (ΔrM) have root-mean-square (RMS) values for 1994–1998 as large as 8 mm, with ranges up to 30 mm, and are predominantly annual in character. Regional strains are on the order of 20 nanostrain for tilt and 5 nanostrain for horizontal deformation. We compare ΔrM with observed Global Positioning System (GPS) heights (ΔrO) (which include adjustments to remove estimated effects of atmospheric pressure and annual tidal and non-tidal ocean loading) for 147 globally distributed sites. When the ΔrO time series are adjusted by ΔrM, their variances are reduced, on average, by an amount equal to the variance of the ΔrM. Of the ΔrO time series exhibiting a strong annual signal, more than half are found to have an annual harmonic that is in phase and of comparable amplitude with the annual harmonic in the ΔrM. The ΔrM time series exhibit long-period variations that could be mistaken for secular tectonic trends or postglacial rebound when observed over a time span of a few years.

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