《Table 1 AMS 14C age of the samples along the surface rupture of 1515 Yongsheng earthquake》

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《"Surface Rupture of the 1515 Yongsheng Earthquake in Northwest Yunnan, and Its Seismogeological Implications"》

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MRA*=Measured Radiocarbon Age.CRA*=Conventional Radiocarbon Age.The test is completed by Beta Analytic Radiocarbon Dating Laboratory.

South of Hongshiya，multi–level fault scarps with a height of several meters to tens of meters are found in limestone along the Jinguan fault（Fig.3c），which were considered to be part of the deformation zone of the 1515Yongsheng earthquake（Guo Shunmin et al.，1988）.Multi–level fault scarps and heights of several meters to several tens of meters all indicate that they are the result of multiple seismic cumulative activities.It is difficult to determine which of them were associated with the Yongsheng earthquake.Tracking southwards along the Chenghai fault，on the eastern side of Pumi，an alluvial fan with about 10 m high above the river，was vertically displaced by the fault and the displacement is about3.8±0.3m（Fig.4e）.The AMS 14C ages of two peat samples collected from the soil layer at both sides of the fault are dated as 1010±30 yr.BP and 1000±30 yr.BP（Fig.4f，Table 1），which indicate the pedogenesis age of this alluvial fan surface.As this alluvial fan has a vertical throw similar to the fresh fault plane in the Jinguan fault，and no obvious multistage displacements have been found since the formation of the fan top，the fault scarp at the top of this fan surface must also be the result of the 1515Yongsheng earthquake.If this is the truth，it can be deemed that the surface rupture of the 1515 Yongsheng earthquake can extend from Banshanhe to Pumi，at least25 km long，and that the co–seismic vertical displacement can be 3.0–3.8 m.