Deformation of the North American plate interior from a decade of continuous GPS measurements

被引:154
作者
Calais, E. [1 ]
Han, J. Y.
DeMets, C.
Nocquet, J. M.
机构
[1] Purdue Univ, Dept Earth & Atmospher Sci, W Lafayette, IN 47907 USA
[2] Purdue Univ, Dept Geomatics, W Lafayette, IN 47907 USA
[3] Univ Wisconsin, Dept Geol & Geophys, Madison, WI 53706 USA
[4] CNRS, UMR Geosci Azur 6526, F-06560 Valbonne, France
关键词
D O I
10.1029/2005JB004253
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
[ 1] A combination of two independent geodetic solutions using data from close to 300 continuous GPS stations covering the central and eastern United States shows that surface deformation in the North American plate interior is best fit by a model that includes rigid rotation of North America with respect to ITRF2000 and a component of strain qualitatively consistent with that expected from glacial isostatic adjustment (GIA). After correcting for the North American plate motion, residual horizontal velocities show a north-to-south deformation gradient of similar to 1 mm yr(-1), mostly localized between 1000 and 2200 km from the GIA center, corresponding to strain rates of about 10(-9) yr(-1). At distances farther than 2100 km from the GIA center, horizontal residual velocities are random with no evidence for regions of elevated strain rates. In particular, we find no detectable residual motion at the 95% confidence level in the New Madrid Seismic Zone, where the average weighted misfit of 0.7 mm yr(-1) is the same as the weighted misfit of our rigid plate model. Vertical velocities show ( 1) a maximum uplift rate of 10 mm yr(-1) at the assumed GIA center, ( 2) a hinge line located 1500 km from that center, and ( 3) a subsidence rate up to 1.4 mm yr(-1) in the forebulge, with a maximum located about 2000 km from the GIA center. Our results have the potential to better constrain glacial isostatic adjustment models and contribute to a better definition of stable North America for tectonic and geodetic applications.
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页数:23
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