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唐山等大地震地电阻率中期下降系压缩应变积累所致 ,为基线缩短、井水位下降所支持。地电阻率、自然电位对起潮力的异常响应及自然电位快急始、慢衰减特殊图象与废油井喷油同步等短临前兆 ,与中期前兆相反显示出向震中迁移的规律 ,表明能量积累从震中向外围传播 ,而能量释放从外围向震中传播。海城地震时喷砂冒水可引起自然电位垂直分量跃变及地光。IIMT法和过剩海洋电流H极化结果表明 ,唐山地震与地壳高阻层及其中存在深大断裂有关。
The mid-term decline in resistivity of large earthquakes such as Tangshan is due to the accumulation of compressive strain, which is supported by the shortening of the baseline and lowering of the well water level. Earth resistivity, spontaneous potential response to tide force and short-term precursors such as spontaneous rapid onset and slow attenuation of special images and the injection of waste oil well, showed the law of migration to epicenters contrary to the medium-term precursors, indicating that energy accumulation From the epicenter to the periphery of the spread, and energy release from the periphery to the epicenter. Sand blasting during the Haicheng earthquake can cause the vertical component of the natural electric potential to jump and the light. The results of IIMT and excess ocean current H polarization show that the Tangshan earthquake is related to the high resistivity crust and its deep faults.