期刊
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
卷 4, 期 -, 页码 -出版社
AMER GEOPHYSICAL UNION
DOI: 10.1029/2003GC000505
关键词
continental deformation; Andes; GPS; interseismic; tectonophysics : continental contractional orogenic belts; seismology : seismicity and seismotectonics; tectonophysics : continental neotectonics
[1] A new Global Positioning System (GPS)-derived velocity field for the Andes mountains (26degrees-36degreesS) allows analysis of instantaneous partitioning between elastic and anelastic deformation at the orogen's opposing sides. Adding an Andes'' microplate to the traditional description of Nazca-South America plate convergence provides the kinematic framework for nearly complete explanation of the observed velocity field. The results suggest the oceanic Nazca boundary is fully locked while the continental backarc boundary creeps continuously at similar to4.5 mm/yr. The excellent fit of model to data (1.7 mm/yr RMS velocity misfit), and the relative aseismicity of the upper crust in the interior Andean region in comparison with its boundaries, supports the notion that the mountains are not currently accruing significant permanent strains. Additionally, the model implies permanent deformation is not accumulating throughout the backarc contractional wedge, but rather that the deformation is accommodated only within a narrow deformational zone in the backarc.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据