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Comparative study on Q_c~(-1) temporal variation characteristics for 4 earthquake sequences in Yunnan area

WANG Wei-jun~1,LIU Jie~2(1.Institute of Earthquake science,CEA,Beijing 100036;2.China Earthquake Networks Center,CEA,Beijing 100036,China)  
Three frequecy band′s Q~(-1)_c of four earthquake sequences in Yunnan Area,Yao′an M6.5 sequence in 2000,Shidian M5 sequences in 2001,Yongsheng M6 sequence in 2001 and Dayao M6.2,M6.1 sequence in 2003,are calculated with vertical digital seismogram in stations around the sequences. By analyzing and comparing their temporal characteristics,we conclude that Q~(-1)_c values to be stable after the main shock for mainshock-aftershock sequences;but for mainshock swarm sequences,Q~(-1)_c values would trend to be increasing at first after the first main shock then decreasing and after a short time lasting the next main earthquake occurs.Those tendencies show rough agreements for Q~(-1)_c in stations around the sequences and three frequency bands except their amplitudes show varying,which would be related to the zone of earthquake generation and the progress of stress accumulation.This research provides a new way to predict strong aftershocks.
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