Earthquake Prediction Research by Means of Telluric Potential Monitoring

为验证van方法在地震预报中的适用性，在分布在全国各地的12个NTT大跨度台站对大地电位进行了连续观测。此外，在最有希望的特贺站周围地区进行了地方和区域特别调查。在当地进行了调查，以研究出现在特西利亚加2号通道（特西利亚加-二别津偶极子）上的异常电位变化的性质，并可能与钏路附近地区的地震活动有关。我们在Nijibetsu初中安装了一个短跨度网络，在N-S和E-W方向分别有50米和100米长的偶极子。在6月至10月期间进行了与NTT大跨度偶极子的同步观测。这种异常变化也出现在短跨度偶极子上。因此，所讨论的异常变化不是由于NTT系统的噪声。现在看来，这些潜在的变化至少有一部分是真正的先兆。为明确区域地下电导率分布规律，进行了区域调查。在NTT的充分合作下，7 - 11月在25号进行了大跨度大地电位测量。

To test the applicability of the VAN-method of earthquake prediction continuous observation of telluric potential was conducted at 12 NTT longspan stations scattered over the country. Moreover, both local and regional special investigations were made in the area surrounding the most promising Teshikaga station. The local investigation was made to study the nature of the anomalous potential changes which appear on Teshiliaga channel 2(Teshikaga-Nijibetsu dipole), and may be correlated with seismicity of the region off Kushiro. We installed a short-span network with 50m and 100m long dipoles in both N-S and E-W directions at the Nijibetsu Junior High School. Simultaneous observation with the NTT long-span dipoles was conducted during June-October. The anomalous changes in question appeared on the short-span dipoles also. Therefore, the anomalous changes in question are not due to noise from the NTT system. It now seems probable that at least some of these potential changes are real precursors. The regional investigation was made to clarify the regional subterranean electrical conductivity distribution. With a full cooperation of NTT, during July-November, long-span telluric potential measurement was conducted at 25.