By preliminary statistics, it is discovered that the proportion of high level earthquake number to lower level event number in the world and in China is 1/8 to 1/9, that is. the latter is about 10 times greater than the former. Then the index predicting the higher magnitude earthquakes by using the lower magnitude earthquakes is studied.
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杨继登.地震活动的层次特征与预报[J].地震工程学报,1992,14(2):53-58. Yang Jideng. THE CHARACTERISTICS OF MAGNITUDE LEVEL AND PREDICTION OF SEISMIC ACTIVITY[J]. China Earthquake Engineering Journal,1992,14(2):53-58.