Journal
TECTONOPHYSICS
Volume 491, Issue 1-4, Pages 21-34Publisher
ELSEVIER
DOI: 10.1016/j.tecto.2009.10.027
Keywords
2008 M-w 7.9 Wenchuan earthquake; Shortening structure; Flexure-slip fold; Protruded fault scarp; Longmen Shan Thrust Belt; Tibetan Plateau
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Funding
- Tokyo Marine Kagami Memorial Foundation, Shizuoka University
- Ministry of Education, Culture, Sports, Science and Technology of Japan [18340158]
- National Natural Science Foundation of China [40672132]
- Grants-in-Aid for Scientific Research [18340158] Funding Source: KAKEN
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We observed ground-shortening structures produced by the 2008 M-w 7.9 Wenchuan earthquake along the 285-km-long Wenchuan co-seismic surface rupture zone. The structures are characterized by co-seismic thrusting and folding structures that include thrust fault scarps, flexure-slip folds, and mole tracks. Fold structures are generally developed within alluvial deposits, river channel deposits, and sealed road surfaces, mainly restricted to within a <100-m-wide corridor (generally <50 m) about the co-seismic thrusting fault scarp along the co-seismic surface rupture zone. The amount of co-seismic horizontal ground shortening accommodated by co-seismic thrusting and folding ranges from 0.1 up to 7.3 m (generally 1-3 m), consistent with GPS observations. Our results, combined with geological and GPS data, confirm that present-day shortening strain upon the eastern marginal zone of the Tibetan Plateau is mainly released by seismic thrusting-folding along active faults within the Longmen Shan Thrust Belt. (C) 2009 Elsevier B.V. All rights reserved.
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