The slip history of the 2008 Wenchuan Sichuan earthquake inverted by empirical Green's function

The Ms 8.0 Wenchuan earthquake of 12 May 2008 was an extraordinary event that produced a 300-km-long surface rupture and was followed by moderate-size many aftershocks in the following days. Due to complex geological conditions around Longmen Shan fault, we use several aftershocks as empirical Green's functions (EGFs) to retrieve the source time functions (STFs) and further image the rupture velocity and slip on the mainshock. First, we try to just use one EGF to inverse, we get some information of slip history of Wenchuan earthquake. However, for such a complicate earthquake which has long surface rupture, we find that just using one EGF is not enough. Finally, according to focal mechanisms of aftershocks occurred on the same fault, we choose one for northeast part and another for southwest part as EGFs and then use the simulated annealing method to retrieve the slip history of Wenchuan earthquake.