区域震群与唐山大震ht
REGIONAL EARTHQUAKE SWARMS AND THE 1976 TANGSHAN EARTHQUAKE
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摘要: 作者把强震孕育过程中处于一定构造条件下的一系列震群事件,统称为区域震群.分析1967年以来华北区域震群的时空进程发现:大约在唐山大震前5年,在未来大震震中区外围,形成了一个震群活动的空区,在空区外围,则出现了一个震群相对活跃的环形区域.环形区域内的震群表现出与唐山大震孕育过程有关的、逐渐增强的阶跃式活动,并在孕震不同阶段的转折时期相对密集;与此同时,大范围区域震群还经历了远场一近场的往返迁移.大震前后区域震群的这种时空分布与地震活动其它指标的变化有所呼应,它们在一定程度上共同勾画出强震前近场与远场的异常特征.由此认为,研究区域震群的时空特征,有可能为强震预报提供某些线索.Abstract: A regional earthquake swarm is defined as a series of earthquake swarm events occurred under a similar geological environment during the seismogenetic stage of a major earthquake. In analysing the temporal and spatial development of regional earthquake swarms in North China since 1967, it may be seen that about 5 years before the Tangshan Earthquake of 1976, a ring-like region of earthquake swarm quiescence or gap appears around the epicenteral area, outside which is a ring-like belt of relatively active earthquake swarms. In this belt of earthquake swarm activity, certain connection with the seismogenetic process of the Tangshan Earthquake could be observed by the gradual increase of earthquake swarms in steps and at the turning points of different stages, it becomes highly intense. At the same time, within a still vast surrounding area, regional earthquake swarms migrate alternatlly between the farther and nearer areas.Before and after the Tangshan Earthquake, such temporal and spatial distribution of regional earthquake swarms, correlate also with the change of other indications of seismic activity to a certain extent. They combine together may constitute the anomalous features of the far and near surounding regions before the great earthquake. It is therefore supposed that study of the characteristics of the temporal and spatial distribution of regional earthquake swarms might possibly give some clue to the prediction of the earthquake.
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[2] 末广重二、关谷溥,前震与地震预报,Tectonophysics, 14, 3——4, 1972.
[3] B. C. Papazaches, Foreshocks and earthquake prediction, Tectonophysics, Z8, 4, 1975.
[4] 金严等,辽宁省海城地震前震震源错动方式的一个特点,地球物理学报,,3, 1976.
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[6] F. F. Evison, Precursory Seismic sequences in New Zealand, New Zealand Joarnal of Geology and Geophysics, 2Z, 1, 1977.
[7] 魏光兴等,1976年春季山东庙岛群岛两次小震群,地震学报,Vo1.2, No. 3, 1980.
[8] 顾浩鼎、曹天青,前兆震群和S波偏振,地震学报,Vo1.2, No. 4, 1980.
[9] 许绍燮等,海城地震前兆系列与震群——兼论前震系列在地震预报中的一种功能,地震学报,3, 1, 1981.
[10] 朱传镇等,震群与大地震关系的研究,地震学报,3, 2, 1981,
[11] 吴开统等,海城地震序列的特征,地球物理学报,19, 2, 1976,
[12] 李全林等,b值时空扫描—监视破坏性地震孕育过程的一种手段,地球物理学报,21,2,1978.
[13] 马鸿庆,华北地区几次大震前的b值异常变化,地球物理学报,21, 2, 1978,
[14] 黄德瑜、冯浩,强震前大范围地震活动参数的时空扫描,地震学报,3, 4, 198i,
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[16] 金安蜀等,北京地区的波速比变化,地震学报,2, 3, 1980,
[17] 朱传镇等,唐山7.8级地震前后微震震源参数,地球物理学报,20,4,1977.
[18] 郑治真、胡柞春,大地震前后平均断错的时空变化,地球物理学报,21, 1, 1978.
[19] 汪成民、陈非比、许心同,对唐山地震前兆现象的几点认识,唐山地震考察与研究,地h出版社,1981.
[20] 姜秀娥、陈非比、汤淮,邢台震群的应力场"窗口"效应,地震,2, 1981.
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