½éÉÜ£º An earthquake with £®1 occurred in Yushu£¬Qinghai Province£¬China£¬at 07£º49 a£®m£®onApril 14£®2010£®according to the Chinese Seismic Station Network£®The sequence is a fore£®main£®after£®shock type sequence£® A foreshock with Åór4£®7 occurred 2 hours and l 1 minutes before the main shock£®There were 12 foreshocks and 2385 aftershocks until June 31£®20l0£®In which£¬there are 21 aftershocks between M3£®0 and M3£®9£® 8 ahershocks between £®0 and £®9£® 2 aftershocks between M5£®0 and M5£®9£®and aftershock between M6£®0 and M6£¬9£® he strongest aftershock is the Yushu earthquake with 6£®3 at 09£º25 a£®m£®on April 14£®20lO (Table 1)£®