Abstract: Based on seismic data recorded by the Xinjiang Digital Seismic Network, we calculated apparent stressses of three M_S6.0 earthquake sequences occurred in 2011-2015. The results show that ① the apparent stresss of the major earthquake is higher than aftershock earthquakes,and there is positive correlation between apparent stresss and earthquake magnitude; ② in a short period of time after the main shock, apparent stress is higher in the sequence and strong aftershock occurred possibly due to stress adjustment after strong earthquake; ③ the apparent stress before strong aftershock earthquake is higher, and come back to low level after strong aftershock. We calculated apparent stresss of Aketao M_S6.7 and Hutubi M_S6.2 earthquake sequences, and the apparent stress of the M_S6.7 earthquake at present is high, but the apparent stress of the M_S6.2 earthquake is low. We compared the apparent stresses of five earthquake equences, and judged the seismic sequence type and maked aftershock predictions of the two earthquakes.

Key words: Apparent stress, Seismic sequence, Earthquake prediction, Aktao M_S6.7 earthquake, Hutubi M_S6.2 earthquake