论文部分内容阅读
通过平行方位相关分析、纯异常矢量比值和功率谱分析、Ｐｃ地电脉动、地电暴湾扰等多种方法论证了岱山中学地电场的短周期（小于４ｄ）变化属于大地电位变化，该观测点是观测大地电位变化的敏感点。同时还分析了澜沧、巴塘等强震前的大地电位异常特征。这些异常变化受周期为１０～３０ｓ的超低频电磁幅射调制，大地电位基值发生几个ｍＶ的短暂变化，异常持续时间为１０～７５ｍｉｎ，其超前时间为８．８～３２．５ｈ
The short-period (less than 4 days) change of the geoelectric field in Daishan Middle School belongs to the change of the earth potential by a variety of methods including parallel azimuth correlation analysis, pure anomaly vector ratio and power spectrum analysis, Pc geoelectric pulsation, Point is a sensitive point to observe changes in the earth potential. The anomalous characteristics of the earth potential before the strong earthquakes such as Lancang and Batang are also analyzed. These abnormal changes are modulated by ultra-low frequency electromagnetic radiation with a period of 10-30s. The base value of the earth potential changes briefly for several mVs, with an abnormal duration of 10-75min and an advance time of 8.8-32.5h