Since the 1930s, the study of seismic luminescence has entered a comprehensive development stage. People no longer doubt about the real existence of earthshine, and theoretical hypotheses explaining this phenomenon have emerged. Japan led the way in these studies.
After 1965, Japanese scholars Yasui, Goro Kondo, Heng Kuribayashi and others used geomagnetometer and rotary collector for observation and research and took the first photo of earthshine. In 1974, Chinese scholar Ma Zongjin, after studying the macroscopic phenomena of previous large earthquakes since the Xingtai earthquake, put forward that earthshine is not only the result of the derivation of earthquake but should be regarded as the unified process of joint development of impending earthquakes. That is to say, the earthshine and other phenomenon occurring at the same time should be related and taken into consideration together.
The Hypothesis and Theory of Seismic Luminescence
In 1972, Japanese scholar Yasui and others proposed the view of "low-level atmospheric oscillation". They argued that the earth is weakly conductive because of the presence of various positive and negative ions in the atmosphere. When gas molecules in the atmosphere are hit by cosmic rays from space and radiation from the earth's own radioactive elements, these ions are charged.
Radon is a major component of the radioactive materials in earthquake zones, which are shaken into the atmosphere by crustal vibration. Especially in the neutral and acidic rock distribution areas with lots of radioactive materials and near faultage, the content of radon in the atmosphere will be significantly increased, which will also enhance the ionic conductivity of the atmosphere.
If there is a natural electric field on the ground, there will be a large discharge into the air will cause the ground to glow. This kind of theory is the hypothesis that comparatively is the case at present.
On February 4, 1975, there was an earthquake of 7.3 magnitude in Haicheng and Yingkou, from Xiuyan in the east to Mian county in the west, Liaozhong in the north and Xinjin in the south. Others saw blue and white light directly from cracks in the ground and pink fireballs coming out of the nozzle of the ground.
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