2003年新疆石河子5.4级地震前地震活动异常分析

分析了2003年2月14日石河子5．4级地震前北天山地震活动图像和地震学参数异常过程。5．4级地震发生在2002年北天山4级地震集中活动区空段，震前12项地震学参数时间进程存在中、短期异常，3项地震波参数出现短期异常。震前3个月乌鲁木齐震情窗出现超警戒线异常。震前10天震中附近地区地震和震群活动显著。

ANALYSIS OF THE SEISMICITY ANOMALIES BEFORE SHIHEZI EARTHQUAKE WITH MS5.4

The anomaly procedure of the seismicity image and seismological parameter are analyzed on the North Tianshan seismic zone before the Shihezi earthquake with Ms5. 4 occurred on Feb. 14,2003. The earthquake with Ms5. 4 occurred in an empty segment of the seismicity centralized region of Ms4. 0 earthquakes in 2002,on North Tianshan Mountain. 12 items of seismicity in temporal proceeding have some medium-term or short-term anomalies before the earthquake. 3 items of seismic wave parameters appeared some short-term anomalies. Seismic window of Urumqi appeared some anomalies of exceeding warning level in three months before the earthquake. And the activity of earthquakes and seismic swarm is marked in the epicenter around areas about 10 days before the earthquake.