陕西区域地震目录最小完整性震级研究
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摘要
本文根据陕西测震台网地震目录和地震观测报告等资料,利用基于G-R关系基础上的EMR法,对1970年以来陕西区域地震目录最小完整性震级Mc的时空展布进行了研究。结果表明:模拟观测阶段(1970—2001年9月),ML2.1级以上地震基本完整;在地震台站数字化阶段(2001年10月—2013年4月),最小完整性震级为ML1.6。从时间尺度上看,陕西地区的地震监测能力在逐步提高。同时还分析研究了陕西地区最小完整性震级的空间分布情况,结果表明陕西北部地区Mc无法计算(缺震),中部较南部偏低。
This article analyzed the earthquake catalogues and monitoring reports of Shaanxi region since 1970, and reaches the conclusion that earthquake above ML2.1 are basically complete during the analog monitoring stage(1970—Sep.2001) and the minimum magnitude of completeness is ML1.6 during the digitalized seismotation stage(Oct.2001—Apr.2013) using Entire-Magnitude Range(EMR) method based on G-R relation. Considering from time scale, the monitoring ability of Shaanxi region keeps improving over time. We also studied the spatial distribution of the minimum magnitude of completeness of Shaanxi region, it turns out that the Mc of Northern Shaanxi can't be calculated(for lacking earthquake) and Mc of central Shaanxi is lower than that of Southern Shaanxi.
This article analyzed the earthquake catalogues and monitoring reports of Shaanxi region since 1970, and reaches the conclusion that earthquake above ML2.1 are basically complete during the analog monitoring stage(1970—Sep.2001) and the minimum magnitude of completeness is ML1.6 during the digitalized seismotation stage(Oct.2001—Apr.2013) using Entire-Magnitude Range(EMR) method based on G-R relation. Considering from time scale, the monitoring ability of Shaanxi region keeps improving over time. We also studied the spatial distribution of the minimum magnitude of completeness of Shaanxi region, it turns out that the Mc of Northern Shaanxi can't be calculated(for lacking earthquake) and Mc of central Shaanxi is lower than that of Southern Shaanxi.
引文
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冯建刚,将长胜,韩立波等,2012.甘肃测震台网监测能力及地震目录完整性分析.地震学报,34(5):646—658.
蒋长胜,吴忠良,李宇彤,2008.首都圈地区“重复地震”及其在区域地震台网定位精度评价中的应用.地球物理学报,51(3):817—827.
韩立波,将长胜,李艳娥等,2012.用于地震可预测性研究CSEP计划的南北地震带地区地震最小完整性震级Mc研究.地震,32(1):17—27.
陕西省地方志编纂委员会,1989.陕西省志地震志.地震出版社:198—208.
陕西省地震局,2005.中国地震监测志系列——陕西省地震监测志.地震出版社.
Aki K.,1965.Maximum likelihood estimate of b in the formula logn=a-bm and its confidence limits.Bull.Earthquake Re.Inst.,Tokyo Unive.,43:237—239.
Cao A.M.and Gao S.S.,2002.Temporal variation of seismic b-values beneath northeastern Japan island arc.Geophys.Res.Lett.,29(9):1334,doi 10.1029/2001GL013775.
Chernick M.R.,1999.Bootstrap Methods,A practitioner's guide.Wiley Series in Probability and Statistics.Wiley-Interscience Publication,USA.
Efron B.,1979.Bootstrap Methods:Another Look at the Jackknife.The Annals of Statistics,7(1):1—26.
Enescu B.and Ito K.,2002.Spatial analysis of the frequency-magnitude distribution and decay rate of aftershockactivity of the 2000 Western Tottori earthquake.Earth Planet Space.,54:847—859.
Gutenberg R.and Richter C.F.,1944.Frequency of earthquakes in California.Bull.Seism.Soc.Amer.,34:185—188.
Gomberg J.,Reasenberg P.,Bodin P.and Harris R.,2001.Earthquake triggering by seismic waves following theLanders and Hector Mine earthquakes.Nature,411:462—466.
Knopoff,L.,2000.The magnitude distribution of declustered earthquakes in Southern California.Proc.Nat.Acad.Sci.,97:11880—11884.
Main I.,2000.Apparent breaks in scaling in the earthquake cumulative frequency-magnitude distribution:fact orartifact?Bull.Seism.Soc.Amer.,90:86—97.
Rydelek P.A.,Sacks I.S.,1989.Testing the completeness of earthquake catalogues and the hypothesis ofself-similarity.Nature,337:251—253.
Stein R.S.,1999.The role of stress transfer in earthquake occurrence.Nature,402:605—609.
Schorlemmer D.,Neri G.,Wiemer S.and Mostaccio A.,2003.Stability and significance tests for b-value anomalies:Example from the Tyrrhenian Sea.Geophys.Res.Letts.,30(16):1835,doi:10.1029/2003GL017335.
Taylor D.W.A.,Snoke J.A.,Sacks I.S.and Takanami T.,1990.Nonlinear frequency-magnitude relationships for theHokkaido corner,Japan.Bull.Seismol.Soc.Am.,80:340—353.
Wiemer S.and Wyss M.,2000.Minimum magnitude of complete reporting in earthquake catalogs:examples fromAlaska,the Western United States,and Japan.Bull.Seism.Soc.Amer.,90:859—869.
Wiemer S.and Wyss M.,2002.Mapping spatial variability of the frequency-magnitude distribution of earthquakes,Adv.Geophys.,45:259—302.
Woessner J.and Wiemer S.,2005.Assessing the quality of earthquake catalogs:Estimating the magnitude ofcompleteness and its uncertainties.Bull.seism.Soc.Amer.,95(4):684—698.
Woessner J.,Hauksson E.,Wiemer S.and Neukomm S.,2004.The 1997 Kagoshima(Japan)earthquake doublet:aquantitative analysis of aftershock rate changes.Geophys.Res.Lett.,31:L03605,doi 10.1029/2003/GL018858.
冯建刚,将长胜,韩立波等,2012.甘肃测震台网监测能力及地震目录完整性分析.地震学报,34(5):646—658.
蒋长胜,吴忠良,李宇彤,2008.首都圈地区“重复地震”及其在区域地震台网定位精度评价中的应用.地球物理学报,51(3):817—827.
韩立波,将长胜,李艳娥等,2012.用于地震可预测性研究CSEP计划的南北地震带地区地震最小完整性震级Mc研究.地震,32(1):17—27.
陕西省地方志编纂委员会,1989.陕西省志地震志.地震出版社:198—208.
陕西省地震局,2005.中国地震监测志系列——陕西省地震监测志.地震出版社.
Aki K.,1965.Maximum likelihood estimate of b in the formula logn=a-bm and its confidence limits.Bull.Earthquake Re.Inst.,Tokyo Unive.,43:237—239.
Cao A.M.and Gao S.S.,2002.Temporal variation of seismic b-values beneath northeastern Japan island arc.Geophys.Res.Lett.,29(9):1334,doi 10.1029/2001GL013775.
Chernick M.R.,1999.Bootstrap Methods,A practitioner's guide.Wiley Series in Probability and Statistics.Wiley-Interscience Publication,USA.
Efron B.,1979.Bootstrap Methods:Another Look at the Jackknife.The Annals of Statistics,7(1):1—26.
Enescu B.and Ito K.,2002.Spatial analysis of the frequency-magnitude distribution and decay rate of aftershockactivity of the 2000 Western Tottori earthquake.Earth Planet Space.,54:847—859.
Gutenberg R.and Richter C.F.,1944.Frequency of earthquakes in California.Bull.Seism.Soc.Amer.,34:185—188.
Gomberg J.,Reasenberg P.,Bodin P.and Harris R.,2001.Earthquake triggering by seismic waves following theLanders and Hector Mine earthquakes.Nature,411:462—466.
Knopoff,L.,2000.The magnitude distribution of declustered earthquakes in Southern California.Proc.Nat.Acad.Sci.,97:11880—11884.
Main I.,2000.Apparent breaks in scaling in the earthquake cumulative frequency-magnitude distribution:fact orartifact?Bull.Seism.Soc.Amer.,90:86—97.
Rydelek P.A.,Sacks I.S.,1989.Testing the completeness of earthquake catalogues and the hypothesis ofself-similarity.Nature,337:251—253.
Stein R.S.,1999.The role of stress transfer in earthquake occurrence.Nature,402:605—609.
Schorlemmer D.,Neri G.,Wiemer S.and Mostaccio A.,2003.Stability and significance tests for b-value anomalies:Example from the Tyrrhenian Sea.Geophys.Res.Letts.,30(16):1835,doi:10.1029/2003GL017335.
Taylor D.W.A.,Snoke J.A.,Sacks I.S.and Takanami T.,1990.Nonlinear frequency-magnitude relationships for theHokkaido corner,Japan.Bull.Seismol.Soc.Am.,80:340—353.
Wiemer S.and Wyss M.,2000.Minimum magnitude of complete reporting in earthquake catalogs:examples fromAlaska,the Western United States,and Japan.Bull.Seism.Soc.Amer.,90:859—869.
Wiemer S.and Wyss M.,2002.Mapping spatial variability of the frequency-magnitude distribution of earthquakes,Adv.Geophys.,45:259—302.
Woessner J.and Wiemer S.,2005.Assessing the quality of earthquake catalogs:Estimating the magnitude ofcompleteness and its uncertainties.Bull.seism.Soc.Amer.,95(4):684—698.
Woessner J.,Hauksson E.,Wiemer S.and Neukomm S.,2004.The 1997 Kagoshima(Japan)earthquake doublet:aquantitative analysis of aftershock rate changes.Geophys.Res.Lett.,31:L03605,doi 10.1029/2003/GL018858.
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