Simplified tectonic map of the Tibetan Plateau (a) and Longmen Shan region (b). Tectonic structures are modified from (Lin, et al. 2009, 2012 Liu-Zeng et al. 2009 Xu et al. 2009 Zhang et al. 2010). Thick red lines on the main map indicate the co-seismic surface ruptures of the 2008 Mw 7.9 Wenchuan earthquake. Green crosses indicate the strong motion seismograph stations. Green triangles indicate the GPS survey locations for ground control points to improve the quality of DEM data derived from stereo pairs of remote sensing imagery data. Black polygons show the co-seismic landslides. Translucent polygons indicate the study areas of Site I, II and III.