Ridge forces, absolute plate motions, and the intraplate stress field

Details Ridge forces, absolute plate motions, and the intraplate stress field Ridge forces, absolute plate motions, and the intraplate stress field

Jul 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jgr....9711739r&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 97, no. B8, July 30, 1992, p. 11,739-11,748.

Physics

80

Mid-Ocean Ridges, Plates (Tectonics), Stress Distribution, Tectonics, Sea Floor Spreading, Torque, Velocity Distribution

Scientific paper

The study calculates torque poles for a variety of possible forces acting on the plates, including ridge push, slab pull, and collisional resistance. These poles are compared to the directions of the absolute plate motions. A strong correlation is found between ridge torque poles and the azimuth of absolute plate motions for the North American, South American, Pacific, Cocos, and Eurasian plates. The correlations are presented as further evidence that the absolute reference frame for plate motion is determined by the surface plates themselves. Torque poles for various forces are also compared with several long-wavelength features of the global intraplate stress fields that also tend to be aligned with absolute motion directions. Ridge torque directions provide an alternative explanation for the alignment of stresses in western Europe. For the Indo-Australian plate, the torque pole for collisional resistance forces is consistent with the general pattern of stresses in at least the western half of the plate but is not a good predictor of the entire data set for the plate.

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