论文部分内容阅读
1976年唐山地震前,在距震中250公里范围內已经建立了16个地电台站。震前10天内有几个台站地电阻率在较平静的趋势背景值上出现大幅度突变异常,尽管这些台站占少数,但却集中分布在发震的沧东断裂附近。 根据唐山地震震源机制解结果,以及发震构造和地下水位变化的实际资料说明,地电阻率突变异常的空间分布与唐山地震断层面是一致的,与震前地下水位变化异常带也是吻合的,地下水震前变化在时间上与地电阻率突变的出现是同步的。
Prior to the 1976 Tangshan earthquake, 16 earth stations had been established within 250 kilometers from the epicenter. In the 10 days before the earthquake, there were several station earth resistivity anomalies with a large magnitude of change in a relatively calm trend. Although these stations are a few, they are concentrated in the vicinity of the Cangdong fault. According to the results of focal mechanism solutions of Tangshan earthquake and the actual data of seismogenic structures and groundwater level changes, the spatial distribution of abnormity of geo-resistivity is consistent with the fault plane of Tangshan earthquake and coincides with the abnormal zone of anomalous groundwater table before the earthquake. Changes in groundwater before the earthquake in time with the emergence of mutations in earth resistance is synchronized.