On April 20th,2013,a strong earthquake (Ms7,China Earthquake Network Center) struck Lushan county of Sichuan province and the quake (hereafter referred to as Lushan earthquake) caused substantial loss of life and damage to infrastructure.Just as the 2008 Ms8 Wenchuan earthquake,the Lushan earthquake also occurred on the Longmenshan fault system.After the Lushan earthquake,preliminary studies of the Lushan earthquake and its possible link to the Wenchuan earthquake have been published in special issues rapidly organized in a few journals such as Seismological Research Letters,Chinese Journal of Geophysics and Science in China.Those studies have investigated many aspects of the Lushan earthquake and suggested possible link between the two earthquakes (for example,Zeng X et al.2013;Han et al.2013;Xie et al.