内蒙古呼和浩特—包头地区地震目录的完整性分析
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摘要
以内蒙古中部的呼和浩特—包头地区(40°～42°N,108°～114°E)作为研究区域,收集整理2001年1月1日至2010年4月30日ML≥1.0地震作为研究对象,按地震样本数目滑动扫描并计算最小完整性震级Mc,绘制Mc的时序变化曲线。分析认为Mc在时间上的变化主要反映台网监测能力和地震活动规律,但台站布局、地震信噪比和人为因素也会引起Mc的短期或不连续性的变化。同时在Rydelek等提出的2个假设条件下,对呼包地区的地震目录完整性进行了RS检验,其结果与上述扫描计算结果一致,也与根据台网监测能力所得到的震级范围吻合,证明本文的计算结果能够比较真实的反映2001年以来呼包地区地震目录在各时段内的完整性。
Taking the Hohhot-Baotou region(40° ~ 42°N,108°~ 114°E) in Central Inner Mongolia as study area,collecting the earthquake events with ML≥1.0 from January 1,2001 to April 30,2010,the number of seismic samples is sliding scaned and the minimum integrality magnitude Mc is calculated.The Mc change curve with time is drawn also.It is considered that Mc change along with the time is mainly reflected by monitoring capabilities of earthquake station network and seismic activities,but the station layout、the earthquake noise ratio and human factors can also cause short-term or discontinuous Mc change.Meanwhile in two assumptions made by Rydelek,the completeness of earthquake catalog in Hohhot-Baotou area is tested by RS method.The tested result is consistent with our Mc value,and also with the monitoring magnitude range obtained from the monitoring ability of local network.So the study result can truly reflect the integrality of earthquake catalog in Hohhot-Baotou area since 2001.
Taking the Hohhot-Baotou region(40° ~ 42°N,108°~ 114°E) in Central Inner Mongolia as study area,collecting the earthquake events with ML≥1.0 from January 1,2001 to April 30,2010,the number of seismic samples is sliding scaned and the minimum integrality magnitude Mc is calculated.The Mc change curve with time is drawn also.It is considered that Mc change along with the time is mainly reflected by monitoring capabilities of earthquake station network and seismic activities,but the station layout、the earthquake noise ratio and human factors can also cause short-term or discontinuous Mc change.Meanwhile in two assumptions made by Rydelek,the completeness of earthquake catalog in Hohhot-Baotou area is tested by RS method.The tested result is consistent with our Mc value,and also with the monitoring magnitude range obtained from the monitoring ability of local network.So the study result can truly reflect the integrality of earthquake catalog in Hohhot-Baotou area since 2001.
引文
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[7]刘杰,陈棋福,陈颞.华北地区地震目录完全性分析[J].地震,1996,16(1):59-67.
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[10]Ogata Y,K Katsura.Analysis of temporal and spatial heter-ogeneityof magnitude frequency distribution inferred fromearthquakecatalogs[J].Geophys.J.Int.,1993,113:727-738.
[11]李建彪,甘卫军,冉永康,等.青藏高原东部构造块体的运动学及变形特征分析[J].西北地震学报,2006,28(2):97-103.
[12]韩晓明,薛丁,刘文广,等.喀喇沁地区震群活动与周围区域中强地震的对应关系研究[J].西北地震学报,2009,31(4):380-384.
[2]焦远碧,吴开统,杨满栋.我国地震台网监测能力及台网观测条件质量评定[J].中国地震,1990,6(4):1-71
[3]黄玮琼,李文香,曹学锋.中国大陆地震资料完整性研究之一:以华北地区为例[J].地震学报,1994,16(3):274-280.
[4]黄玮琼,李文香,曹学锋.中国大陆地震资料完整性研究之二:分区地震资料基本完整的起始年分布图象[J].地震学报,1994,16(4):423-432.
[5]Stefan Wiemer,Max Wyss.Minimum Magnitude of Com-pleteness in Earthquake Catalogs:Examples from Alaska,the Western United States,and Japan[J].BSSA,2000,90(4),859-869.
[6]苏有锦,李永莉,李忠华,等.川滇地区区域地震目录完整性最小震级分析[J].地震研究,2003,26(增刊):10-16.
[7]刘杰,陈棋福,陈颞.华北地区地震目录完全性分析[J].地震,1996,16(1):59-67.
[8]何宗海.中国南北地震带中北部最小完整性震级的探讨[J].西北大学学报(自然科学版),1994,24(5):411-416.
[9]Cao A M,S S Gao.Temporal variation of seismic b-valuesbe-neath northeastern Japan Island arc[J].Geophys.Res.Lett.,2002,29:no.9,doi 10.1029/2001GL013:775.
[10]Ogata Y,K Katsura.Analysis of temporal and spatial heter-ogeneityof magnitude frequency distribution inferred fromearthquakecatalogs[J].Geophys.J.Int.,1993,113:727-738.
[11]李建彪,甘卫军,冉永康,等.青藏高原东部构造块体的运动学及变形特征分析[J].西北地震学报,2006,28(2):97-103.
[12]韩晓明,薛丁,刘文广,等.喀喇沁地区震群活动与周围区域中强地震的对应关系研究[J].西北地震学报,2009,31(4):380-384.
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