The 20 April 2013 Lushan earthquake, Ms 7.0 (China Earthquake Data Center [CENC]) or Mw 6.6 (U.S. Geological Survey [USGS]), with 196 people killed, and more than 10,000 injured according to the local government’s official report, was the strongest earthquake after the 12 May 2008, Ms 8.0 (CENC) or Mw 7.9 (USGS), Wenchuan earthquake in Sichuan province, China. This earthquake occurred in the southwestern part of the Longmen Shan fault zone, which also was the same causative fault zone of the 2008 Wenchuan earthquake (Fig. 1). The epicenter and focal depth of the Lushan earthquake were at 30.308° N, 102.888° E, and 14.0 km, according to the location of USGS (http://comcat.cr.usgs.gov/earthquakes/eventpage/usb000gcdd#summary, last accessed August 2013). The focal mechanism of the Lushan event showed a thrust rupture which was similar to that of the southwestern part of the Wenchuan earthquake rupture (Fig. 1). The slip distribution of the Lushan earthquake was concentrated at the hypocenter, and did not rupture to the surface (Zhang et al., 2013, 2014).