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Continental deformation in Asia from a combined GPS solution
Author(s) -
Calais E.,
Dong L.,
Wang M.,
Shen Z.,
Vergnolle M.
Publication year - 2006
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2006gl028433
Subject(s) - lithosphere , geology , geodetic datum , geodesy , plate tectonics , deformation (meteorology) , interpolation (computer graphics) , buoyancy , tectonics , seismology , global positioning system , geophysics , mechanics , oceanography , computer science , telecommunications , physics , animation , computer graphics (images)
After decades of research on continental tectonics, there is still no consensus on the mode of deformation of continents or on the forces that drive their deformation. In Asia the debate opposes edge‐driven block models, requiring a strong lithosphere with strain localized on faults, to buoyancy‐driven continuous models, requiring a viscous lithosphere with pervasive strain. Discriminating between these models requires continent‐wide estimates of lithospheric strain rates. Previous efforts have relied on the resampling of heterogeneous geodetic and Quaternary faulting data sets using interpolation techniques. We present a new velocity field based on the rigorous combination of geodetic solutions with relatively homogeneous station spacing, avoiding technique‐dependent biases inherent to interpolation methods. We find (1) unresolvable strain rates (<3 × 10 9 /yr) over a large part of Asia, with current motions well‐described by block or microplate rotations, and (2) internal strain, possibly continuous, limited to high‐elevation areas.