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早在1891年慕尼黑地震和1923年日本关东地震都曾记录到与地震相伴出现的地电变化。但有意识地研究与地震有关的地电变化,只是在六十年代后,由于全球又进入了一个新的地震活动高潮期,人们甚为震害担忧,尤其对于多震国家。因此,各国地球物理学家总希望能否通过某些前兆观测,特别是对于震前各种地球物理场变化的观测,以获取一定地震信息。
As early as the 1891 Munich earthquake and the 1923 Kanto Earthquake in Japan have recorded the earthquakes accompanied by changes in the earth’s electricity. However, consciously studying the earth-quake-related changes in geoelectricity, it was only after the 1960s that people were particularly concerned about earthquakes as the world entered a new upsurge in seismic activity, especially for multi-earthquake countries. Therefore, the geophysicists of various countries always hope whether certain precursory observations can be made, especially for the observation of various geophysical changes before the earthquake so as to obtain certain seismic information.