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唐山地震前后,在昌黎地磁台和北京地磁台观测到地磁垂直分量Z十数天功率谱成份的振幅相对于远离震中的红山台有程度不等的异常变化。北京、昌黎二台相对红山台的地磁Z分量下午日变幅步长为15天的相关分析,表明在同一时段相关系数r降,偏差σ上升,说明二台与红山台间,存在着周期接近于统计步长半月的非一致变化。与此相应,西集、塘沽地电(自然电)场记录、旺_11和鄚_1废油井自喷及余震(M_L≤3.0)日频度功率谱均显示半月周期变化。 本文试图用孔隙流体扩散及包体膨胀硬化的周期效应解释上述周期性现象。
Before and after the Tangshan earthquake, the amplitude of the geomagnetic vertical component Z in Changli geomagnetic observatory and Beijing geomagnetic observatory over a period of ten days showed an anomalous variation with respect to the magnitude of the Hongshan Observatory away from the epicenter. The correlative analysis of the geomagnetic Z component in Beijing and Changli relative to Hongshan station on the afternoon of the 15th showed that the correlation coefficient r decreased and the deviation σ increased in the same period, indicating that there exists a The period is close to the non-uniform change of half of the statistical step. Correspondingly, the daily frequency power spectrum of Xiji and Tanggu geoelectricity (natural electricity) records and Wang _11 and 鄚_1 waste oil spits and aftershocks (M_L≤3.0) show the half-moon period variation. This paper attempts to explain the above-mentioned periodic phenomena by the periodic effects of pore fluid diffusion and enveloping expansion hardening.