Sichuan Wenchuan 7.5 earthquake collect stickers. (From: U.S. Seismological Bureau)
  Wu Jiaoxing to the source
 
 
  Notes related picture:

  Theory of the earthquake. (Note: Sichuan special terrain, the source in western Sichuan plateau, but the Sichuan Basin within a particular geographical shape the role of shock absorption, greatly reduce the extent of the victims)
 
  Notes related picture: