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Oblique Convergence in the Himalayas of Western Nepal Deduced from Preliminary Results of GPS Measurements

Jouanne, F. and Mugnier, J. L. and Pandey, M. R. and Gamond, J. F. and Le Fort, P. and Serrurier, L. and Vigny, C. and Avouac, J. P. (1999) Oblique Convergence in the Himalayas of Western Nepal Deduced from Preliminary Results of GPS Measurements. Geophysical Research Letters, 26 (13). pp. 1933-1936. ISSN 0094-8276. doi:10.1029/1999GL900416.

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A GPS network consisting of 29 sites was installed in central and western Nepal, with measurements taken in 1995 and partial remeasurements in 1997. Data suggest 15 +/−5 mm/yr of N180° convergence between the Higher Himalayas and India, a result that is consistent with N‐S shortening across the arcuate shape of the Nepalese Himalayas and an oblique underthrusting of the Indian crust below the High Himalayas of western Nepal. A 4 +/−3 mm/year E‐W extension and deviation of the principal shortening axes are inferred east of 83°E, where Quaternary faults (Darma‐Bari Gad fault system and Thakkhola graben) delineate a crustal wedge. This wedge is located on the SE projection of the Karakorum fault and may segment the Himalayan thrust belt. The convergence between the outer belt of western Nepal and India is less than 3 mm/yr, an attenuation consistent with creep on a dislocation locked beneath the Lesser Himalayas. A preliminary model suggests that this N 120°E striking dislocation is affected by a 19 mm/yr thrust component and a 7 mm/yr right lateral component.

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Avouac, J. P.0000-0002-3060-8442
Additional Information:© 1999 American Geophysical Union. Received 28 October 1998; revised March 23, 1999; accepted 27 April 1999. Idylhim is a French-Nepali project sponsored by CNRS-TNSU (France), and the Idylhim members are Chaudury N.L., Chitrakar G.R., Galy A., Gautam U.P., Glot J.P., Kaffle B .. Koirala B.P., Leturmy P., Ranabhat R., Sapkota S.N., Shrestha P.L., Thakury M.C., Timilsina U.R .. Tiwari U.R., Vidal G. and De Yoogd B. K. Larson and R. Bilham are thanked for sharing geodetic results from Nepal. We thank Robert Yeats and an anonymous reviewer for usefull reviews.
Group:Seismological Laboratory, Division of Geological and Planetary Sciences
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Centre National de la Recherche Scientifique (CNRS)/ Institut national des sciences de l'Univers (INSU) (France)UNSPECIFIED
Issue or Number:13
Record Number:CaltechAUTHORS:20120910-112201921
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Official Citation:Jouanne, F., J. L. Mugnier, M. R. Pandey, J. F. Gamond, P. Le Fort, L. Serrurier, C. Vigny, J. P. Avouac, and Idylhim Members (1999), Oblique convergence in the Himalayas of western Nepal deduced from preliminary results of GPS measurements, Geophys. Res. Lett., 26(13), 1933–1936, doi:10.1029/1999GL900416.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:33961
Deposited By: Ruth Sustaita
Deposited On:11 Sep 2012 20:29
Last Modified:09 Nov 2021 23:05

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