Abstract
The Daliangshan fault zone is the eastern branch in the central section of Xianshuihe-Xiaojiang fault system. It has been neglected for a long time, partly because of no destructive earthquake records along this fault zone. On the other hand, it is located on the remote and inaccessible plateau. So far it was excluded as part of the Xianshuihe-Xiaojiang fault system. Based on the interpretation of aerophotographs and field investigations, we document this fault zone in detail, and give an estimation of strike-slip rate about 3 mm/a in Late Quaternary together with age dating data. The results suggest that the Daliangshan fault zone is a newly-generated fault zone resulted from shortcutting in the central section of Xianshuihe-Xiaojiang fault system because of the clockwise rotation of the Southeastern Tibetan Crustal Block, which is bounded by the Xianshuihe-Xiaojiang fault system. Moreover, the shortcutting may make the Daliangshan fault zone replace the Anninghe and Zemuhe fault zones gradually, and finally, the later two fault zones will probably die out with the continuous clockwise rotation.
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Supported by the National Basic Research Program of China (Grant No. 2004CB418401), the National Natural Science Foundation of China (Grant No. 40472109), Joint Earthquake Science Foundation of China (Grant No. 105066), and Japan Grant-in Aid for Scientific Research from Japan Ministry of Education, Culture, Sports, Science and Technology (Grant No. 18500776)
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He, H., Ikeda, Y., He, Y. et al. Newly-generated Daliangshan fault zone — Shortcutting on the central section of Xianshuihe-Xiaojiang fault system. Sci. China Ser. D-Earth Sci. 51, 1248–1258 (2008). https://doi.org/10.1007/s11430-008-0094-4
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DOI: https://doi.org/10.1007/s11430-008-0094-4