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中文摘要：
处理、分析榆树地震台自建台以来2604天的地电场分钟值数据，结果表明：①该台地电场正常的日变化曲线形态呈现典型的“双峰单谷”变化；②地电场分钟值曲线峰谷极值时间与本地日出和日落时问吻合；③地电场观测记录的短周期信号（小于1h）受观测环境的影响较小；④在中强地震前，能够捕捉到明显的异常信息，等等。
英文摘要：
In this paper, the minute value data of geoelectrie field at Yushu Seismic Station in 2 604 days since the station has constructed are processed and analyzed, the results shows that ：① The typical daily change of the geoelectric field observed at Yushu Seismic Station is double peaks and single valley;②The time of peaks and valley extremum for curve of minute value of geoelectric field coincide with sunrise and sundown in local area③The influence is smaller in short period signal（less than one hour）by observation environment of geoelectric field ;④The evident abnormal information were caught before middling and strength earthquakes, and so on.
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