云南地区地震目录最小完整性震级研究
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摘要
通过对构造活动强烈、地震活动频度高、台站分布极不均匀的云南地区开展最小完整性震级MC研究,试图为地震危险性评估和台站科学布局等研究提供参考资料。基于云南区域地震台网发展阶段,利用基于G-R关系的交互式分析方法,研究了MC的空间分布特征;采用多参数方法研究了云南8个地震区(带)的MC时间演化特征。结果表明:云南区域台网不同发展时段MC的空间分布存在较大的非均匀性,大理—丽江—盐源区、元谋区、小江带等区(带)监测能力较好,澜沧—耿马区、思普区等区(带)监测能力较低。但云南"十五"区域数字地震台网运行以来,云南省MC可达ML1.5左右,其中大理—丽江—盐源区MC可控制在ML1.0～1.5,小江带MC约为ML1.5,腾冲—龙陵区MC可控制在ML1.0～2.0,澜沧—耿马区MC可控制在ML1.5～2.5,思普区MC约为ML1.0～2.0。云南地区8个地震区(带)MC时间变化特征分析结果表明,增加台站数量,优化台网布局,是提升云南地区地震监测能力的有效途径。
We study the minimum magnitude of completeness MC in Yunnan with intense tectonic movement,high frequent of earthquake activity and non-uniform distribution of seismic stations,which could provided useful information for seismic risk evaluation and scientific layout of seismic stations etc..On the basis of development stage of Yunnan Regional Network(YRN),we studied the spatial distribution feature by using interactive analysis method based on the G-R relation and investigated temporal variation of MC in 8 seismic zone in Yunnan by means of multi-parameter description.The result shows that in different stage of YRN,MC is distributed inhomogeneously;the monitoring capability of YRN in Dali-Lijiang-Yanyuan zone,Yuanmou zone,and Xiaojiang earthquake belt is strong,but weak in Lancang-Genma zone,Simao-Puér belt,etc..Since the running of YRN improved during the Tenth Five-year Plan(2001-2005),MC in Yunnan reached ML1.5 or so,ranged between ML1.0-1.5 in Dali-Lijiang-Yanyuan zone,ML1.5 in in Xiaojiang zone,ML1.0-20 in TenchongLongling,ML1.5-2.5 in Lancang-Genma,and ML1.0-2.0 in Simao-Puér.The temporal variation of MC for 8 seismic zones shows that adding stations and optimizing network are the effective ways for improving seismic monitoring capability in Yunnan region.
We study the minimum magnitude of completeness MC in Yunnan with intense tectonic movement,high frequent of earthquake activity and non-uniform distribution of seismic stations,which could provided useful information for seismic risk evaluation and scientific layout of seismic stations etc..On the basis of development stage of Yunnan Regional Network(YRN),we studied the spatial distribution feature by using interactive analysis method based on the G-R relation and investigated temporal variation of MC in 8 seismic zone in Yunnan by means of multi-parameter description.The result shows that in different stage of YRN,MC is distributed inhomogeneously;the monitoring capability of YRN in Dali-Lijiang-Yanyuan zone,Yuanmou zone,and Xiaojiang earthquake belt is strong,but weak in Lancang-Genma zone,Simao-Puér belt,etc..Since the running of YRN improved during the Tenth Five-year Plan(2001-2005),MC in Yunnan reached ML1.5 or so,ranged between ML1.0-1.5 in Dali-Lijiang-Yanyuan zone,ML1.5 in in Xiaojiang zone,ML1.0-20 in TenchongLongling,ML1.5-2.5 in Lancang-Genma,and ML1.0-2.0 in Simao-Puér.The temporal variation of MC for 8 seismic zones shows that adding stations and optimizing network are the effective ways for improving seismic monitoring capability in Yunnan region.
引文
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Rabinowitz N,Steinberg D M.1990.Optimal configuration of a seis-mographic network:A statistical approach[J].BSSA,80(1):187-196.
Stein R S.1999.The role of stress transfer in earthquake occurrence[J].Nature,402:605-609.
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Woessner J,Hauksson E,Wiemer S,et al.2004.The1997Kogoshima(Ja-pan)earthquake doublet:A quantitative analysis of aftershock ratechanges[J].Geophys Res Lett,31:L03605,doi:10.1029/2003/GL018858.
Woessner J,Wiemer S.2005.Assessing the quality of earthquake cata-logues:Estimating the magnitude of completeness and its uncertainty[J].BSSA,95(2):684-698.
Wüster J,Rivière F,Crusem R,et al.2000.GSETT-3:Evaluation of thedetection and location capabilities of an experimental global seismicmonitoring system[J].BSSA,90(1):166-186.
皇甫岗,陈颙,秦嘉政,等.2010.云南地震活动性[M].昆明:云南科技出版社.
蒋长胜,吴忠良,李宇彤.2008.首都圈地区“重复地震事件”及其在区域地震台网定位精度评价中的应用[J].地球物理学报,51(3):817-827.
孟玉梅,赵永,王斌.2001.中国地震观测台网地震速报定位偏差的分析[J].地震,21(3):65-69.
苏有锦,李永莉,李忠华,等.2003.川滇地区区域地震目录完整性最小震级分析[J].地震研究,26(增刊):10-16.
闻学泽,易桂喜.2003.川滇地区地震活动统计单元的新划分[J].地震研究,26(增刊):1-9.
Amorèse D.2007.Applying a change-point detection method on frequen-cy-magnitude distributions[J].BSSA,97(5):1742-1749.
Bartal Y,Somer Z,Leonard G,et al.2000.Optimal seismic networks in Is-real in the context of the comprehensive Test Ban Treaty[J].BSSA,90(1):151-165.
Cao A M,Gao S S.2002.Temporal variation of seismic b-values beneathnortheastern Japan island arc[J].Geophys Res Lett,29(9):1334,doi:10.1029/2001GL013775.
Doufexopoulou M,Korakitis R.1992.Resolution analysis of seismic net-works[J].Phys Earth Planet Interi,75(1-3):121-129.
Enescu B,Ito K.2002.Spatial analysis of the frequency-magnitude distri-bution and decay rate of aftershock activity of the2000Western Tot-tori earthquake[J].Earth Planet Space,54:847-859.
Gomberg J,Reasenberg P,Bodin P,Harris R.2001.Earthquake triggeringby seismic waves following the Landers and Hector Mine earthquakes[J].Nature,411(6836):462-466.
Gutenberg R,Richter C F.1944.Frequency of earthquakes in California[J].BSSA,34:185-188.
Knopoff L.2000.The magnitude distribution of declustered earthquakes inSouthern California[J].Proc Nat Acad Sci,97(22):11880-11884.
Main I G.1996.Statistical physics,Seismogenesis,and seismic hazard[J].Rev Geophys,34(4):433-462.
Main I.2000.Apparent breaks in scaling in the earthquake cumulative frequency-magnitude distribution:Fact or artifact[J].BSSA,90(1):86-97.
Marsan D.2003.Triggering of seismicity at short timescales following Cal-ifornian earthquakes[J].JGR,108(B5):2266,doi:10.1029/2002JB001946.
Nanjo K Z,Schorlemmer D,Woessner J,et al.2010.Earthquake detectioncapability of the Swiss Seismic Network[J].Geophys J Inter,181(3):1713-1724.
Rabinowitz N,Steinberg D M.1990.Optimal configuration of a seis-mographic network:A statistical approach[J].BSSA,80(1):187-196.
Stein R S.1999.The role of stress transfer in earthquake occurrence[J].Nature,402:605-609.
Wiemer S,Wyss M.2000.Minimum magnitude of completeness in earth-quake catalogs:Examples from Alaska,the Western United Statesand Japan[J].BSSA,90(4):859-869.
Woessner J,Hauksson E,Wiemer S,et al.2004.The1997Kogoshima(Ja-pan)earthquake doublet:A quantitative analysis of aftershock ratechanges[J].Geophys Res Lett,31:L03605,doi:10.1029/2003/GL018858.
Woessner J,Wiemer S.2005.Assessing the quality of earthquake cata-logues:Estimating the magnitude of completeness and its uncertainty[J].BSSA,95(2):684-698.
Wüster J,Rivière F,Crusem R,et al.2000.GSETT-3:Evaluation of thedetection and location capabilities of an experimental global seismicmonitoring system[J].BSSA,90(1):166-186.
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