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本文通过对京津地区十个重点井孔水氡资料的处理分析,发现唐山地震前,京津地区水氡异常场有几个显著的特征。京津唐一带区域性水氡的升高变化,是该区构造应力场加强的结果,当观测区域受力达到线应变为10~(-6)—10~(-5)数量级的状态时,可以观测到水氡明显的异常变化。水氡中短期异常的扩散现象及临震突跳的收缩现象,是与震源应力场直接有关联的前兆变化。水氡异常的机理是复杂的,是多种作用的综合。
In this paper, by analyzing the radon data of 10 key boreholes in Beijing-Tianjin area, it is found that there are several significant features of anomalous water radon fields in Beijing and Tianjin before the Tangshan earthquake. The increase of regional radon in Beijing, Tianjin and Tangshan area is the result of tectonic stress field strengthening in this area. When the strain in the observation area reaches the state where the linear strain is in the order of 10 -6 to 10 -5, Significant abnormal changes in water radon can be observed. The phenomenon of short-term anomalous water radon diffusion and the sudden shrinkage of the epicenter are the precursor changes directly related to the source stress field. The mechanism of water radon anomaly is complex and is a combination of multiple roles.