2003年新疆巴楚-伽师6.8级地震异常的阶段性特征

对6．8级地震的中期和短期以及短临阶段异常特征进行了系统的分析研究。从新疆大区域范围到震源区，对这次地震前地震活动图像和前兆观测资料的动态演化过程进行了深入分析，研究不同孕震阶段各类异常的基本特征。结果认为，6．8级地震前异常的中期阶段，新疆中强地震平静显著；短期阶段中等地震显著增强．震源区出现前震活动；同时全疆定点前兆观测资料出现较为明显的短期异常，并观测到少量的临震异常。异常具有准同步性、显著性、突发性和响应性等特征。

The character of anomaly of Bachu-Jiashi earthquake in 2003

In this paper, we analyses the anomalies of the Bachu-Jiashi earthquake that with magnitude 6.8. The analysis is in a range from the focus to the Xinjiang region, and includes dynamic evolvement of the seismicity and precursory information, the basic characters in different phases before earthquake: the medium-term, the short-term and the short forthcoming. It can be concluded that, in the medium-term of anomaly, the quietude of the middle-strong earthquake is clear. During the short-term phase, the middle-strong earthquake is active. Some foreearthquakes appeared in epicenter area. The precursory anomalies of short-term were obvious all over the whole Xinjiang. Some imminent precursory anomalies have been observed. All of the anomalies have a notable, quasi-synchronous, paroxysmal and responsive character.