Individual analysis and statistical research of hail-cloud formation in Xiyang area have been presented in this paper.
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2. 本文通过对昔阳、武乡台记录的300余个地震进行统计分析，求出符合该2个台的新起算函数值。
Through the statistical analysis for over 300 earthquakes recorded in Xiyang and Wuxiang station, the new calibcation function corresponding with the 2 stations has been derived.
The Sijiazhuang minefield in Xiyang County, Shanxi Province is located in the Yangquan mining area strike transition from NW to NS zone, had experienced three stressing actions early or late.
