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天山地区的高压自流水、高压油气藏及地热异常区的出露与天山地震带分布的一致性表明,孔隙水压异常高的动力条件可能成为触发浅源地震的重要机制。本文以丰富的震例为依据,认为天山地震带中强地震前地下流体出现两类异常:一类是应力应变能积累阶段的趋势性异常;一类是应力应变能预释放阶段的临震突发性异常。两类异常在形态上和时空分布上有完全不同的特征,它们显示出地震孕育过程中的两个完全不同的物理、化学过程。
The consistent distribution of high pressure gravity water, high pressure reservoirs and geothermal anomalous zones in the Tianshan Mountains and the distribution of the Tianshan seismic belt shows that the dynamic conditions with abnormally high pore water pressure may be an important mechanism for triggering shallow-earthquakes. Based on abundant earthquake cases, it is considered that there are two types of anomalies in the subsurface fluid before moderately strong earthquakes in the Tianshan seismic belt: one is the trend anomaly during the stress-strain energy accumulation phase; the other is the sudden onset of stress and strain energy Abnormal hair. Both types of anomalies have completely different morphological and temporal distributions and show two completely different physical and chemical processes during the gestation.