GPS measurements from the Ladakh Himalaya, India: Preliminary tests of plate-like or continuous deformation in Tibet Export

@article{citeulike:2032057, abstract = {Observations of relative motion in a geodetic network in Ladakh, India, and across southern Tibet indicate slow shear on the Karakorum fault, rapid east-west extension across the whole of southern Tibet, and constant arc-normal convergence between India and southern Tibet along the Himalayan arc. Measurements of ten campaign-style and six permanent sites with global positioning system (GPS) precise geodesy provide these bounds on the style and rates of the large-scale deformation in the Tibet-Himalaya region. Divergence between sites at Leh, Ladakh, India, and Shiquanhe, western Tibet, as well as slow relative motion among sites within the Ladakh network, limit right-lateral slip parallel to the Karakorum fault to only 3.4 ± 5 mm/yr. This low rate concurs with a recent estimate of 3–4 mm/yr for Late Holocene time, but disagrees with the much higher rate of 30–35 mm/yr that has been used to argue for plate-like behavior of the Tibetan Plateau. Convergence between Ladakh and the Indian subcontinent at 18.8 ± 3 mm/yr at 224° ± 17° (1{sigma}) differs little from estimates of convergence across the central segment of the Himalaya. Finally, lengthening of the baseline between Leh, Ladakh, and Lhasa (in southeastern Tibet) at 17.8 ± 1 mm/yr or between Leh and Bayi (farther to the southeast) at 18 ± 3 mm/yr, is consistent with an extrapolation of rates of east-west extension of the Tibetan Plateau based both on shorter GPS baselines (e.g., Lhasa-Simikot) and on diverging slip vectors of earthquakes in the Himalaya. We interpret these results to indicate that Tibet behaves more like a fluid than like a plate.}, author = {Jade, S. and Bhatt, Bc and Yang, Z. and Bendick, R. and Gaur, Vk and Molnar, P. and Anand, Mb and Kumar, D.}, citeulike-article-id = {2032057}, citeulike-linkout-0 = {http://portal.isiknowledge.com/portal.cgi/wos?Init=Yes&SID=S1BML@defCHpEfD38lG}, citeulike-linkout-1 = {http://bulletin.geoscienceworld.org/cgi/reprint/116/11-12/1385.pdf}, journal = {GSA Bulletin}, keywords = {continuum, geodesy, geodynamics, himalayakarakorum, mechanics, plateau, tibetan}, month = {November}, number = {11-12}, organization = {Geological Society of America}, pages = {1385--1391}, posted-at = {2007-11-30 20:07:37}, priority = {2}, publisher = {Geological Society of America}, title = {GPS measurements from the Ladakh Himalaya, India: Preliminary tests of plate-like or continuous deformation in Tibet}, url = {http://portal.isiknowledge.com/portal.cgi/wos?Init=Yes&SID=S1BML@defCHpEfD38lG}, volume = {116}, year = {2004} }

TY - JOUR ID - citeulike:2032057 L3 - citeulike-article-id:2032057 N2 - Observations of relative motion in a geodetic network in Ladakh, India, and across southern Tibet indicate slow shear on the Karakorum fault, rapid east-west extension across the whole of southern Tibet, and constant arc-normal convergence between India and southern Tibet along the Himalayan arc. Measurements of ten campaign-style and six permanent sites with global positioning system (GPS) precise geodesy provide these bounds on the style and rates of the large-scale deformation in the Tibet-Himalaya region. Divergence between sites at Leh, Ladakh, India, and Shiquanhe, western Tibet, as well as slow relative motion among sites within the Ladakh network, limit right-lateral slip parallel to the Karakorum fault to only 3.4 ± 5 mm/yr. This low rate concurs with a recent estimate of 3–4 mm/yr for Late Holocene time, but disagrees with the much higher rate of 30–35 mm/yr that has been used to argue for plate-like behavior of the Tibetan Plateau. Convergence between Ladakh and the Indian subcontinent at 18.8 ± 3 mm/yr at 224° ± 17° (1{sigma}) differs little from estimates of convergence across the central segment of the Himalaya. Finally, lengthening of the baseline between Leh, Ladakh, and Lhasa (in southeastern Tibet) at 17.8 ± 1 mm/yr or between Leh and Bayi (farther to the southeast) at 18 ± 3 mm/yr, is consistent with an extrapolation of rates of east-west extension of the Tibetan Plateau based both on shorter GPS baselines (e.g., Lhasa-Simikot) and on diverging slip vectors of earthquakes in the Himalaya. We interpret these results to indicate that Tibet behaves more like a fluid than like a plate. IS - 11-12 JF - GSA Bulletin OR - Geological Society of America EP - 1391 TI - GPS measurements from the Ladakh Himalaya, India: Preliminary tests of plate-like or continuous deformation in Tibet PB - Geological Society of America VL - 116 SP - 1385 KW - continuum KW - geodesy KW - geodynamics KW - himalayakarakorum KW - mechanics KW - plateau KW - tibetan AU - Jade, S AU - Bhatt, Bc AU - Yang, Z AU - Bendick, R AU - Gaur, Vk AU - Molnar, P AU - Anand, Mb AU - Kumar, D PY - 2004/11// UR - http://portal.isiknowledge.com/portal.cgi/wos?Init=Yes&SID=S1BML@defCHpEfD38lG ER -