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介绍了Ω概率统计法的原理和计算公式，使用１９７０～１９９３年陕西省ＭＬ≥２．３级地震目录，用Ω概率统计法分析了陕西地震震级的分布特征，得到陕西省ＭＬ４．０和ＭＬ５．０级地震的复发周期。
The principle and calculation formula of Ω probability statistical method are introduced. Using the catalog of ML≥2.3 earthquakes in Shaanxi Province from 1970 to 1993, the distribution characteristics of earthquakes in Shaanxi Province are analyzed by Ω probability method, and the ML4.0 and ML5 .0 Earthquake recurrence cycle.