山东及邻区小震活动月频次分布浅析
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摘要
采用1975—2010年4月山东区域地震台网地震目录,确定研究区地震震级下限,剔除余震,对预处理后的小震活动月频次进行Kolmogorov-Smirnov分布检验,及小震月频次(x)与累计次数之间的函数拟合。结果表明,山东地区小震活动月频次符合正态分布,月频次与其累计次数之间存在类似G-R关系。对小震月频次分布的峰度K_U、偏度S_k、C_v值以及b_m值随时间的变化进行分析,结果表明,研究区内13次M_L≥5.0地震前,月频次分布表现出明显起伏变化。
Using earthquake catalog from 1975 to April 2010 recorded by Shandong Earthquake Net, the minimum magnitude of completeness in the study area is determined.Then the after shocks are eliminated from catalog in Shandong Province and its neighboring areas.The distribution of monthly number for small earthquakes after pretreatment and the function relationship between the monthly number and the accumulative frequency of the monthly number are tested.The results show that the distribution of the monthly number agrees with normal distribution,the relationship between the monthly number and the accumulative frequency resembles the G-R law.The changes of Kurtosis,Skewness,value and value of the monthly frequency with time are analyzed.It is shown that before the 13 earthquakes with M_L≥5.0 in Shandong Province and its neighboring areas,the distribution of the small earthquake monthly number changes up and down obviously.
Using earthquake catalog from 1975 to April 2010 recorded by Shandong Earthquake Net, the minimum magnitude of completeness in the study area is determined.Then the after shocks are eliminated from catalog in Shandong Province and its neighboring areas.The distribution of monthly number for small earthquakes after pretreatment and the function relationship between the monthly number and the accumulative frequency of the monthly number are tested.The results show that the distribution of the monthly number agrees with normal distribution,the relationship between the monthly number and the accumulative frequency resembles the G-R law.The changes of Kurtosis,Skewness,value and value of the monthly frequency with time are analyzed.It is shown that before the 13 earthquakes with M_L≥5.0 in Shandong Province and its neighboring areas,the distribution of the small earthquake monthly number changes up and down obviously.
引文
陈学忠,郭祥云,李艳娥.首都圈地区小震活动月频次分布特征[J].地震,2007,27(4) :36-42．
季爱东,刘希强,孙庆文,等.发震中的山东数字地震台网[J].地震地磁观测与研究,2008,29(4) :86-90．
马青禾,杨明芝,李春贵.小地震发生率和累计次数变化的理论解释及应用实例[J].地震,2008,28(1) :7-64．
王晓青,陈学忠,李志雄,等.地震前兆群体空间非均匀性指标C_v值研究[J].中国地震,1999,15(3) :200-209．
易桂喜,韩渭宾.四川及邻区强震前地震活动频度的变化特征[J].地震研究,2004,27(1) :8-13．
刁守中,华爱军,刘西林.苍山5． 2级地震异常群体时空演化特征[J].东北地震研究,2002,18(2) :1-19．
Gutenberg B,Richter C F.Frequency of Earthquake in California[J].Bulletin of the Seismological Socie of America,1994,34:185-188．
Stephans M,A use of Kolmogorov-Smirnov Cramervon Misse and relate statistics without extensive tables[J].Roy Statist Soc Ser,1970,B32:115-122．
Wiemer S,Wyss M.Minimum magnitude of com plete reporting in earthquake catalogs:Examples from Alaska,the Western United States,and Japan[J].Bull Seism Soc Am,2000,90:859-869．
季爱东,刘希强,孙庆文,等.发震中的山东数字地震台网[J].地震地磁观测与研究,2008,29(4) :86-90．
马青禾,杨明芝,李春贵.小地震发生率和累计次数变化的理论解释及应用实例[J].地震,2008,28(1) :7-64．
王晓青,陈学忠,李志雄,等.地震前兆群体空间非均匀性指标C_v值研究[J].中国地震,1999,15(3) :200-209．
易桂喜,韩渭宾.四川及邻区强震前地震活动频度的变化特征[J].地震研究,2004,27(1) :8-13．
刁守中,华爱军,刘西林.苍山5． 2级地震异常群体时空演化特征[J].东北地震研究,2002,18(2) :1-19．
Gutenberg B,Richter C F.Frequency of Earthquake in California[J].Bulletin of the Seismological Socie of America,1994,34:185-188．
Stephans M,A use of Kolmogorov-Smirnov Cramervon Misse and relate statistics without extensive tables[J].Roy Statist Soc Ser,1970,B32:115-122．
Wiemer S,Wyss M.Minimum magnitude of com plete reporting in earthquake catalogs:Examples from Alaska,the Western United States,and Japan[J].Bull Seism Soc Am,2000,90:859-869．
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