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《Earthquake》 1985-04
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ANOTHER EXPRESSION METHOD OF SPACIAL CONCENTR- ATEDNESS OF EARTHQUAKES AND ITS APPLICATION TO EARTHQUAKE PREDICTION

Gu .Fangqi (Seismological Bureau of Anqing City, Anhui Province)  
In this paper, another expression for space concentratedness of earthquakes is presented as: C1 = da/d where 3 represents the average distance between individual earthquakes and their nearest ones, d0 , the average distance between earthquakes and their nearest ones in case the earthquakes are distributed in ideal randomness. The greater the C1 value is, the higher the concentratedness of earthquakes becomes. Examples of 7 earthquake cases in North China studied show that there is a process in which the C2 was rising anomalously several months or 2 years or so before the main earthquakes. It is obvious that the minor earthquake activities were concentrated in space distribution before the main earthquakes. Discussions are also made on the non-randomness of earthquake distribution and the physical meaning of the C1 value.
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