It is studied that size of the area of region for calculating modulated small earthquake ratio using earthquake catalogue recorded by Gansu seismic network since 1988.Modulated small earthquake ratio is calculated respectively in five regions chosen in Gansu Province and its vicinity.Results show that an appliable minimum area is 6 square degree.
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董积平.关于甘肃地区小震调制比异常区域面积选取问题的讨论[J].地震工程学报,1997,19(3):94-96,100. DONG Jiping. DISCUSSION ON CHOICE OF THE AREA OF REGION FOR CALCULATING MODULATED SMALL EARTHQUAKE RATIO IN GANSU[J]. China Earthquake Engineering Journal,1997,19(3):94-96,100.