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Interseismic coupling on the main Himalayan thrust

Stevens, V. L. and Avouac, J. P. (2015) Interseismic coupling on the main Himalayan thrust. Geophysical Research Letters, 42 (14). pp. 5828-5837. ISSN 0094-8276. doi:10.1002/2015GL064845.

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We determine the slip rate and pattern of interseismic coupling on the Main Himalayan Thrust along the entire Himalayan arc based on a compilation of geodetic, interferometric synthetic aperture radar, and microseismicity data. We show that convergence is perpendicular to the arc and increases eastwards from 13.3 ± 1.7 mm/yr to 21.2 ± 2.0 mm/yr. These rates are comparable to geological and geomorphic estimates, indicating an essentially elastic geodetic surface strain. The interseismic uplift rate predicted from the coupling model closely mimics the topography, suggesting that a small percentage of the interseismic strain is permanent. We find that the fault is fully locked along its complete length over about 100 km width. We don't find any resolvable aseismic barrier that could affect the seismic segmentation of the arc and limit the along-strike propagation of seismic ruptures. The moment deficit builds up at a rate of 15.1 ± 1 × 10^(19) N m/yr for the entire length of the Himalaya.

Item Type:Article
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Avouac, J. P.0000-0002-3060-8442
Additional Information:© 2015 American Geophysical Union. Received 8 JUN 2015; Accepted 8 JUL 2015; Accepted article online 14 JUL 2015; Published online 29 JUL 2015. The GPS used for the inversion are included in a SI file. The coupling and stress rate maps are provided as electronic data in SI files. All data for this paper are properly cited and referred to in the reference list. Jack Loveless and an anonymous reviewer gave useful reviews and comments. The Editor thanks John Loveless and an anonymous reviewer for their assistance in evaluating this paper.
Group:Seismological Laboratory
Subject Keywords:Himalaya; tectonics; interseismic coupling; seismic hazard; GPS
Issue or Number:14
Record Number:CaltechAUTHORS:20150903-124854490
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Official Citation:Stevens, V. L., and J. P. Avouac (2015), Interseismic coupling on the main Himalayan thrust, Geophys. Res. Lett., 42, 5828–5837, doi:10.1002/2015GL064845.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:60051
Deposited By: Tony Diaz
Deposited On:08 Sep 2015 02:59
Last Modified:10 Nov 2021 22:28

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