Co-Seismic Strike-Slip and Rupture Length Produced by the 2001 Ms 8.1 Central Kunlun Earthquake Aiming Lin, Bihong Fu, Jianming Guo, Qingli Zeng, Guangming Dang, Wengui He, and Yue Zhao

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Supplemental Figure 1. Typical outcrops (Sites 1~4) of the Kunlun rupture zone where displacements were measured. (A), Fault scarp and mole track produced by a 6-8 meters of pure sinistral offset of south-slopping alluvial fans (Site 7). View is toward the east. (B), All view of Site 1 where the stream channel and gullies were offset 4.3-4.5 m. View is toward the north. (C), Right-stepping echelon extensional cracks (Site 2). The gullies were offset 4.6-4.8 m. View is toward the east. (D), Two gullies were offset 4.0 m in horizontal and o.6 m in vertical in the northern site of Kusai Lake (Site 3). View is toward the north. (E), The stream channel (indicated by red solid circles) and alluvial fans were offset about 11.8 m (the distance between two men who stand on the eastern edge of the stream channel, Site 4). (F), The stream channel was offset 16.3 m across a zone of 550 m wide (Site 4). View is toward the north. White arrows indicate the general trend of the shear faults and the surface rupture zone. Pair red arrows indicate the sense of fault motion.

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Supplemental Figure 2. Typical outcrops (Sites 6~9) of the Kunlun rupture zone where displacements were measured. (A), The stream channel was offset 7.2 m (Site 6). View is toward the east. (B), The gullies were systematically offset 3.8-4.5 m at the Kunlun Pass (Site 7). View is toward the north. (C), The stream channel was offset 6.8 m (Site 7). View is toward the north. (D), The road was offset 3.3 m at the Kunlun Pass (Site 7). View is toward the north. (E), The gully was offset 4.2 m (Site 8). View is toward the north. (F), Surface ruptures observed at the location near the eastern end of the rupture zone (Site 9). The small gullies were sinistrally offset 5-8 cm. View is toward the northeast. Pair red arrows indicate the sense of fault motion.

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Supplemental Figure 3. Sketch showing distribution of surface rupture and displacement across a stream channel at site 4 where the maximum left-lateral displacement of 16.3 m was observed. The surface rupture zone is composed of three distinct shear faults striking N74°W and dipping 83°-86°N and a lot of extensional cracks striking N80°E to N85°W.

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