| Citation: | Han Mingming, Chen Lichun, Li Yanbao, Gao Shuaipo, Feng Jiahui, 2022. Geological and Geomorphic Evidence for Late Quaternary Activity of the Bianba-Luolong Fault on the Western Boundary of the Bangong-Nujiang Suture. Earth Science, 47(3): 757-765. doi: 10.3799/dqkx.2022.042
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The Bianba-Luolong fault, which runs through the Sichuan-Tibet Railway under planning and construction, is the western boundary fault of the southeastern section of the Bangong-Nujiang suture. The Late Quaternary activity of the fault is of great significance for understanding the development and evolution history of the suture and researching the dynamics of the present tectonic deformation in SE Tibetan Plateau, and is also directly related to the planning and construction of the Sichuan-Tibet Railway and the safety of engineering earthquake. Historical records show that two large earthquakes, the 1642-1654 Luolong M ≥7 earthquake and the 1791-1804 Bianba M 63/4 earthquake, have occurred on the Bianba-Luolong fault. However, whether the fault has been seismically active in the Holocene remains a subject of debate due to poor research and lack of reliable geologic and geomorphological evidence. In this study, we focus on the Late Quaternary activity of the Bianba-Luolong fault based on interpretation of remote sensing imagery, analysis of field fault outcrops, faulted landforms and chronological measurement of 14C samples. It is suggested that the Bianba-Luolong fault is an active Holocene fault, and the main movement of the fault is sinistral strike-slip. Specifically, the latest faulting event occurred after (3 310±30) a BP, which possibly corresponds to the 1642-1654 Luolong M ≥7 earthquake. Survey results also show that the surface traces of the Bianba-Luolong fault activity is significantly discontinuous during the Late Quaternary, which is not completely consistent with the previous boundary fault of the Bangong-Nujiang suture, suggesting that the activity of suture zone may be undergoing a new evolution since the Late Quaternary.
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