【摘要】 本文使用嘉山地电台自１９７４年建台以来近２０年的自然电位日均值，研究了该台自然电位与附近３００ｋｍ范围内Ｍ＿Ｌ≥４．５地震的关系。根据１９７９年的实验数据分析初步推测，该台东西向自然电位在七十年代与中强震较好的对应关系可能是由于西测量电极埋在对地震孕育敏感的部位所致。震前由于局域应力场的变化引起地下水流动和渗流的变化，影响到西测量电极周围的水文物理条件或化学条件的变化，从而造成东西方向自然电位大幅度升降，出现震前异常显示。更多还原

【Abstract】 In this paper,relationship between natural geoelectric potential observed at Jiashan station of Anhui Province and moderate earthquakes（M_L≥4.5,△≤300km）around this station has been studied based on the all curves of daily means from 1974 to 1993. According to the field experiment results in 1979,the better response of natural potential to the moderate earthquakes in the 1970s is probably caused by the positions where west measuring electrode is sensitive to earthquake preparation. In the seismogenic process,the variations of regional tectonic stress field result in changes of the level,physical properties and chemical constituents of ground water around the west measuring electrode,thus make natural potential E_WE rise or drop by a big margin更多还原