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研究了地电短临震兆机理，在此基础上给出了引潮力触发地电短临前兆模式。据此从理论上分析了地电临震震兆特征，并以唐山７．８级大震为例，从实际观测中检出具有此模式特征的震兆（具有起潮力特征），从而验证了所提模式理论的客观存在的可能性。最后给出与此有关的地电短临预报方法。即，根据脆性岩石失稳的相对刚度比较准则，定义部分岩体刚度λ＝０的状态为临震阶段，分析λ＝０时起潮力引起位移的特征和规律，得出原地监测岩体刚度是否为零（进入临震阶段）的方法。因为在弹性阶段，λ为较大正值，微小的起潮力只引起微小的位移，此时的电响应甚小，通常检测不到；但随着构造力的积累，介质进入临震阶段，此时同样微小的起潮力却可引起甚大的位移（λ＝０时，位移为无穷大），从而产生可检测的电响应。由于这种电响应具有与起潮力相同的周期，故可把临震电响应同各种干扰区分开，判定为临震前兆，从而建立了地电临震前兆起潮力触发模式，并可给出相应的短临预报方法。对１９７６年唐山７．８级强震前后震中周围地电阻率及大地电场实测资料进行谱分析，发现仅在主震前二个月至半月内，两种不同物理本质的电响应分别出现与起潮力ＭＳ波与ＭＳｆ波周期相同的异常变化。这是对所提临震前兆模式和预报?
This paper studies the mechanism of short-term earthquakes in geoelectricity, and on this basis, gives a brief introduction of the tidal force-triggered short-term precursory mode. Based on this, the characteristics of earthquake epicenter shock truncations are theoretically analyzed. Taking the magnitude 7.8 Tangshan earthquake as an example, the earthquake truncation (with the characteristics of climates) is detected from the actual observations to verify The possibility of the objective existence of the proposed model theory. Finally, the related short-term and short-term forecast methods are given. That is, according to the comparison criterion of the relative stiffness of brittle rock instability, the condition that part of the rock mass stiffness λ = 0 is defined as the epicenter phase. By analyzing the characteristics and regularities of the tidal displacement induced by λ = 0, Whether the stiffness is zero (into the quake phase) method. Because in the elastic phase, λ is a large positive value, the tiny tide force causes only slight displacement, the electrical response at this time is very small, usually undetectable; but with the accumulation of structural force, the medium into the quake phase, At this time, the same small tide force can cause a great displacement (λ = 0, the displacement of infinity), resulting in a detectable electrical response. Since this kind of electrical response has the same period as the tidal force, it can distinguish the temporary electrical response from various interferences and judge it as precursory precursor, so as to establish a triggering mode of precursory tide force of geoelectric power. The corresponding short-term forecast method is given. The spectral analysis of the earth resistivity around the epicenter before and after the MS7.8 Tangshan earthquake in 1976 and the measured data of the earth electric field show that the electrical responses of two different physical properties appear separately from The abrupt change of the tidal MS wave with the MSf wave period is the same. Is this a precursor to the quake mode and forecast?