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我国几次大震及若干次中强地震前,观测到震中周围地电阻率具有三个阶段的异常变化。异常各阶段具有明显不同的形态和规律。本文重点系统地分析研究了地电短临异常的特征和规律。初步探讨地电异常与孕震过程的联系。根据观测资料分析对比,提出有效地电短临异常的观测条件,即要求台址地下介质电性分层特性ρ_2/ρ_1《1及地电观测资料无年变化为最佳。
Before several large earthquakes in our country and several moderate-strong earthquakes, the observed earthquakes around the epicenter had three anomalous changes. Abnormal stages have distinctly different patterns and laws. This paper focuses on systematic analysis of the characteristics and laws of the short-term geoelectric anomalies. Preliminary discussion of the relationship between geoelectric anomalies and seismogenic processes. According to the comparison and analysis of the observed data, the effective observation conditions for the short-term and short-term anomalies are put forward. That is, it is required that the ρ 2 / ρ 1 "