【摘要】 研究了震前自然电场的前兆及其可能机理。主要结论：（１）５．４－６．２级地震在１５０－２００ｋｍ， ７． ０－ ７． ９级地震在 ２５０ ｋｍ范围内自然电场出现前兆；（２）过滤电场、电化学电场、土体受压变密和机电转换可能是自然电场的前兆机理。更多还原

【Abstract】 The earthquake precursor and mechanism of natural geoelectric field have been studied in this paper. The mean results show that: (1)The range of the natural geoelectric field precursor before earthquakes with 5 .4 ≤ M≤6. 2 is 150 ~ 250 km and before earthquakes with 7 .0≤ M≤7.9≤is 250 km around the observation area; (2)The filtrating electrical field , redox potential, the solum changing into compact under the pressure and machine-electricity transform are possible mechanisms of the natural geoolectric field precursor.更多还原