青藏高原北部地区强震演化过程研究

研究了青藏高原北部地区≥ 7级地震时空分布特征、孕育演化过程,并探讨了物理解释。结果表明,本地区≥ 7级地震空间上受区内主要活动断裂控制,发震间隔时间具有一定的规律性;同时,本地区≥ 7级地震的孕震演化过程具有共性行为,表现为孕震构造10年尺度的大范围中强震平静,研究区2～ 5年尺度的中强震频发,末次中强震的时空任意性等特征,对区域地震分析预报具有实用价值。

THE EVOLUTION PROCESS OF EARTHQUAKE WITHMS≥ 7.0 IN NORTHERN AREA OF TIBET PLATEAU

In this paper, the features of spatial-temporal distribution and processes of evolution of strong earthquake with MS≥ 7. 0 are studied in the Northern area of Tibet Plateau, and a preliminary physical explanation has also been given. The results show that the spatial locations of strong earthquake have been controlled by the main active faults in the area, and the intervals have certain regular features. Meanwhile, the processes of evolution have some common behaviors, for example: 1. a wide quiet area of moderate strong earthquake appeared in the gestation faults and its neighbor region for 10 years; 2. moderate strong quakes occurred more frequently in the research regionfr 2 to 5 years; 3. the last moderate strong earthquakes showed irregularity in spatial temporal distribution. All of above features have practice value in local earthquake prediction.