An earthquake with ．1 occurred in Yushu，Qinghai Province，China，at 07：49 a．m．onApril 14．2010．a(chǎn)ccording to the Chinese Seismic Station Network．The sequence is a fore．main．a(chǎn)fter．shock type sequence． A foreshock with 朋r4．7 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．a(chǎn)nd aftershock between M6．0 and M6，9． he strongest aftershock is the Yushu earthquake with 6．3 at 09：25 a．m．on April 14．20lO (Table 1)．
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