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THE EFFECT OF LUNAR PHASE OF SEISMICITY IN NORTH CHINA AND ITS SIGNIFICANCE TO EARTHQUAKE PREDICTION

Chen Xuezhong; Zhong Nancai;Ding Jianhai1) Center for Analysis and Prediction, Beijing 100036, China 2) The Technical College of Precautions Against Natural Calamities, Beijing 101601, China  
The effect of lunar phase of earthquakes with M. ≥4. 0 occurred in North China since 1970 is analyzed. The results indicate that the occurrence of earthquakes with Ms ≥5. 0 does not show correlation with the lunar phase and is obviously stochastic. Before the strong earthquakes with Ms ≥7. 0, however, the occurrence of the moderate earthquake is obviously related to the lunar phase. It is significant in the medium-and short-term predic-tion of earthquakes Ms ≥7. 0. When the moderate earthquakes occur near the period of new moon or full moon, the future strong earthquakes would occur. At Present , the oc-currence of the moderate earthquakes in North China does not show correlation to the lu-nar phase , so theposslbllity of the occurrence of earthquakes with Ms ≥7. 0 will be rela-tively low.
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