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GPS measurements from the Ladakh Himalaya, India; preliminary tests of plate-like or continuous deformation in Tibet

Sridevi Jade, B. C. Bhatt, Z. Yang, R. Bendick, V. K. Gaur, P. Molnar, M. B. Anand and Dilip Kumar
GPS measurements from the Ladakh Himalaya, India; preliminary tests of plate-like or continuous deformation in Tibet
Geological Society of America Bulletin (December 2004) 116 (11-12): 1385-1391

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+ or -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+ or -3 mm/yr at 224 degrees + or -17 degrees (1sigma ) 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+ or -1 mm/yr or between Leh and Bayi (farther to the southeast) at 18+ or -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.


ISSN: 0016-7606
EISSN: 1943-2674
Coden: BUGMAF
Serial Title: Geological Society of America Bulletin
Serial Volume: 116
Serial Issue: 11-12
Title: GPS measurements from the Ladakh Himalaya, India; preliminary tests of plate-like or continuous deformation in Tibet
Affiliation: CSIR Centre for Mathematical Modelling and Computer Simulation, Bangalore, India
Pages: 1385-1391
Published: 200412
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 42
Accession Number: 2004-085837
Categories: Solid-earth geophysics
Document Type: Serial
Bibliographic Level: Analytic
Annotation: Cambridge Earth Sci. Paper ES-7503
Illustration Description: illus. incl. 2 tables, sketch maps
N27°00'00" - N37°00'00", E72°00'00" - E97°00'00"
N07°00'00" - N37°00'00", E68°00'00" - E97°00'00"
N27°00'00" - N37°00'00", E79°00'00" - E99°00'00"
Secondary Affiliation: Indian Institute of Astrophysics, IND, IndiaChang'an University, CHN, ChinaUniversity of Colorado at Boulder, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 200424
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