Co-and post-seismic vertical displacements of the Wenchuan MS8. 0 earthquake, derived from pre-seismic leveling data and two measurements in 2008 and 2010 along two first-order leveling lines near Beichuan, show the following features:Co-seismic displacement along Beichuan-Yingxiu fault was as large as 4.711 m near Beichuan, where the maximum observed fault offset was 5. 1 m. In contrast, the observed co-seismic offset of the Qingchuan fault in Pingwu County was only 0.064 m. From 2008 to 2010, the post-seismic displacement rate was 5~27 mm/a near Beichuan-Yingxiu fault in Beichuan area, 20.6 mm/a at Jiangyou-Guangyuan fault near Dakang, and only 0. 2~1.3 mm/a at Qingchuan fault near Gucheng
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