| 区域震群与唐山大震ht |
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| 引用本文： | 姜秀娥,陈非比.区域震群与唐山大震ht[J].地震学报,1983,5(2):145-157. |
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| 作者姓名： | 姜秀娥 陈非比 |
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| 作者单位： | 1. 国家地震局分析预报中心
2. 地震出版社 |
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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.
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REGIONAL EARTHQUAKE SWARMS AND THE 1976 TANGSHAN EARTHQUAKE |
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| Affiliation: | 1. Analysis and Prediction Center, State Seismological Bureau;
2. Seismologieal Press, State Seismological Bureau |
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| 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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