青藏高原北部地区强震演化过程研究
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摘要
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。
In this paper, the features of spatial temporal distribution and processes of evolution of strong earthquake with M S ≥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 region for 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.
In this paper, the features of spatial temporal distribution and processes of evolution of strong earthquake with M S ≥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 region for 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.
引文
1 陈家超.青藏高原地震地质特征及现阶段北部边缘地震活动的危险性.见:徐煜坚,郭增建编.青藏高原地震文集.西宁:青海人民出版社,1988.30～36
2 焦远碧.甘青菱形块体地震活动时空强特征.见:徐煜坚,郭增建编.青藏高原地震文集.西宁:青海人民出版社,1988.81～88
3 涂德龙.1937年托索湖7.5级地震形成机制和震源模式的初步探讨.见:徐煜坚,郭增建编.青藏高原地震文集.西宁:青海人民出版社,1988.59～62
4 梅世蓉,薛艳,宋治平.华北地区强震前地震活动长期演变过程的共性.见:李宣瑚主编.地震短临预报的理论与方法.北京:地震出版社,1997.3～12
5 韩渭滨.三种地震“平静”的概念及其预报意义综合.国际地震动态,1998(5):9～13
2 焦远碧.甘青菱形块体地震活动时空强特征.见:徐煜坚,郭增建编.青藏高原地震文集.西宁:青海人民出版社,1988.81～88
3 涂德龙.1937年托索湖7.5级地震形成机制和震源模式的初步探讨.见:徐煜坚,郭增建编.青藏高原地震文集.西宁:青海人民出版社,1988.59～62
4 梅世蓉,薛艳,宋治平.华北地区强震前地震活动长期演变过程的共性.见:李宣瑚主编.地震短临预报的理论与方法.北京:地震出版社,1997.3～12
5 韩渭滨.三种地震“平静”的概念及其预报意义综合.国际地震动态,1998(5):9～13
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