2010年4月14日青海玉树7.1级地震前震中附近地区小震活动的周、月频次分布特征
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摘要
根据Kolmogorov-Smirnov分布检验法,利用2000年以来1.7≤ML≤2.9地震目录,对2010年4月14日青海玉树MS7.1前震中附近地区2000年以来地震活动的月频次和2007年7月以来地震活动的周频次分布进行了检验。结果表明,地震活动周频次和月频次都不符合泊松分布和正态分布,但周、月频次累积次数的对数与周、月频次之间呈线性关系,类似于G-R关系。分析了周、月频次的标准差σ、CV值、偏度Sk、峰度Ku和bm值等参数随时间的变化,发现在2010年4月14日青海玉树地震前,这些参数都出现了不同程度的异常变化,其中周频次的分布参数随时间的变化似乎呈现出了某种周期性特征。
The Kolmogorov-Smirnov test is adopted to test the distribution of the month-sca1enumber since 2000 and the week-sca1e number since 2007 by using the earthquakes of 1.7≤ML≤2.9 occurring around the epicenter prior to the April 14,2010 Yushu,Qinghai Provinceearthquake with MS7.1.The results show that the weekly number and the monthly number agreewith neither the normal distribution nor the Possion distribution.And the relationship between theaccumulative frequency of the weekly and monthly numbers and the weekly and monthly numbersresembles the Gutenberg-Richter law.Analyzing the temporal changes of the parameters,such asthe standard deviation σ,CV value,skewness Sk,kurtosis Ku and bm value,of the weekly andmonthly numbers,we find that these parameters changed obviously prior to the April 14,2010Yushu,Qinghai Province earthquake of MS7.1,and the parameters for the weekly number seemto change in a periodic way.
The Kolmogorov-Smirnov test is adopted to test the distribution of the month-sca1enumber since 2000 and the week-sca1e number since 2007 by using the earthquakes of 1.7≤ML≤2.9 occurring around the epicenter prior to the April 14,2010 Yushu,Qinghai Provinceearthquake with MS7.1.The results show that the weekly number and the monthly number agreewith neither the normal distribution nor the Possion distribution.And the relationship between theaccumulative frequency of the weekly and monthly numbers and the weekly and monthly numbersresembles the Gutenberg-Richter law.Analyzing the temporal changes of the parameters,such asthe standard deviation σ,CV value,skewness Sk,kurtosis Ku and bm value,of the weekly andmonthly numbers,we find that these parameters changed obviously prior to the April 14,2010Yushu,Qinghai Province earthquake of MS7.1,and the parameters for the weekly number seemto change in a periodic way.
引文
陈学忠、郭祥云、李艳娥,2007,首都圈地区小震活动月频次分布特征,地震,27(4),36～42。
陈学忠、郭祥云、李艳娥,2010,龙门山断裂带地震活动的月尺度频次分布特征,地震,30(2),20～28。
李志雄、高旭,1994,地震非均匀度的研究及在强震中期预报中的应用,地震,14(6),11～18。
Stephans M A,1970,Use of the Kolmogorov-Smirnov,Cramérvon Mises and related statistics without extensive tables,J Roy StatistSoc Ser,B32,115～122.
陈学忠、郭祥云、李艳娥,2010,龙门山断裂带地震活动的月尺度频次分布特征,地震,30(2),20～28。
李志雄、高旭,1994,地震非均匀度的研究及在强震中期预报中的应用,地震,14(6),11～18。
Stephans M A,1970,Use of the Kolmogorov-Smirnov,Cramérvon Mises and related statistics without extensive tables,J Roy StatistSoc Ser,B32,115～122.
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