甘肃岷县漳县6.6级地震强震动观测记录与初步分析
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摘要
2013年7月22日甘肃省定西市岷县漳县交界(东经104.2°,北纬34.5°)发生M6.6地震。甘肃强震动台网在该地区覆盖良好,获得了丰富的主震加速度记录。本文收集整理了此次地震中各强震动台站获得的加速度记录资料并进行了基本处理;经统计分析绘出了峰值加速度分布图。
The Minxian-Zhangxian MS6.6 earthquake occurred on July 22,2013,at the junction of Minxian and Zhangxian,Dingxi,Gansu Province(E 104.2°,N 34.5°).The depth of this widespread earthquake was shallow,which caused huge casualties and property losses.In this region,numerous professional strong motion observation stations recorded valuable acceleration records that accurately reflect the ground vibration of the main shock in the corresponding region of Gansu province and play an important role in the evaluation of earthquake development trends.In the present study,these acceleration records were collected and preliminary processed,and the results of peak ground acceleration were statistically analyzed.We determined that 47strong motion stations obtained acceleration records,which included four types of strong motion seismographs such as MR2002,Etna,GSR-18,and GSMA-2400.The Minxian strong motion station was the closest to the epicenter at a distance of 18.0km and peak accelerations of 160.7gal(EW),172.5gal(NS),and 78.4gal(vertical).The farthest station from the epicenter was Songshan at a distance of 297.3km and peak accelerations of 3.3gal(EW),3.1gal(NS),and2.0gal(vertical).By calculation,we ascertained that the EW,NS,and vertical acceleration values were 1.2～160.7gal,0.4～172.5gal,and 0.4～78.4gal,respectively.This earthquake decayed quickly,and the peak acceleration of stations 100km from the epicenter was only approximately 10gal.For this earthquake,the Minxian station showed the largest peak acceleration.Located in the Minyang township of Minxian,this station is situated in a good observation environment with stable equipment;therefore,the records obtained by this station are reliable.In addition,the peak ground acceleration of each station gradually reduced with epicentral distance.However,But the effects of anisotropic media and site conditions may have resulted in unequal peak ground acceleration values for different locations at the same epicentral distance.Although the Lintan strong motion station was 79.5km from the epicenter,its peak acceleration was only approximately 5gal.The Songshan was farthest from epicenter;however,its peak acceleration was not minimal.These special conditions may be associated with local geological formations and site environment.On the basis of the peak acceleration obtained by each station,we used the Kriging interpolation method and plotted the peak acceleration map of the Minxian-Zhangxian earthquake.The simulated values accurately reflected the ground motion intensity of the earthquake for each observation point to provide basic information for research on the characteristics of strong ground motion and seismic engineering.Moreover,this map can provide an important basis for rapid damage assessment and earthquake emergency planning.In this study,the work was preliminary pending further research after accumulation of supplemental data.
The Minxian-Zhangxian MS6.6 earthquake occurred on July 22,2013,at the junction of Minxian and Zhangxian,Dingxi,Gansu Province(E 104.2°,N 34.5°).The depth of this widespread earthquake was shallow,which caused huge casualties and property losses.In this region,numerous professional strong motion observation stations recorded valuable acceleration records that accurately reflect the ground vibration of the main shock in the corresponding region of Gansu province and play an important role in the evaluation of earthquake development trends.In the present study,these acceleration records were collected and preliminary processed,and the results of peak ground acceleration were statistically analyzed.We determined that 47strong motion stations obtained acceleration records,which included four types of strong motion seismographs such as MR2002,Etna,GSR-18,and GSMA-2400.The Minxian strong motion station was the closest to the epicenter at a distance of 18.0km and peak accelerations of 160.7gal(EW),172.5gal(NS),and 78.4gal(vertical).The farthest station from the epicenter was Songshan at a distance of 297.3km and peak accelerations of 3.3gal(EW),3.1gal(NS),and2.0gal(vertical).By calculation,we ascertained that the EW,NS,and vertical acceleration values were 1.2～160.7gal,0.4～172.5gal,and 0.4～78.4gal,respectively.This earthquake decayed quickly,and the peak acceleration of stations 100km from the epicenter was only approximately 10gal.For this earthquake,the Minxian station showed the largest peak acceleration.Located in the Minyang township of Minxian,this station is situated in a good observation environment with stable equipment;therefore,the records obtained by this station are reliable.In addition,the peak ground acceleration of each station gradually reduced with epicentral distance.However,But the effects of anisotropic media and site conditions may have resulted in unequal peak ground acceleration values for different locations at the same epicentral distance.Although the Lintan strong motion station was 79.5km from the epicenter,its peak acceleration was only approximately 5gal.The Songshan was farthest from epicenter;however,its peak acceleration was not minimal.These special conditions may be associated with local geological formations and site environment.On the basis of the peak acceleration obtained by each station,we used the Kriging interpolation method and plotted the peak acceleration map of the Minxian-Zhangxian earthquake.The simulated values accurately reflected the ground motion intensity of the earthquake for each observation point to provide basic information for research on the characteristics of strong ground motion and seismic engineering.Moreover,this map can provide an important basis for rapid damage assessment and earthquake emergency planning.In this study,the work was preliminary pending further research after accumulation of supplemental data.
引文
[1]周雍年.强震动观测技术[M].北京:地震出版社,2011.Zhou Y N.Strong Motion Observation Technique[M].Beijing:Seismological Press,2011.(in Chinese)
[2]胡聿贤.地震工程学[M].北京,地震出版社,2006.Hu Y X.Earthquake Engineering[M].Beijing:Seismological Press,2006.(in Chinese)
[3]谢礼立,于双久.强震观测与分析原理[M].北京,地震出版社,1982.Xie L L,Yu S J.Strong Motion Observation and Analysis Principle[M].Beijing:Seismological Press,1982.(in Chinese)
[4]周朝晖.2008年四川汶川8.0级地震强震动台网观测记录[J].四川地震,2008,4:25-29.Zhou Z H.The Strong Ground Motion Recordings of the M8.0Wenchuan Earthquake in Sichuan Province[J].Earthquake Research in Sichuan,2008,4:25-29.(in Chinese)
[5]刘旭宙,姚凯,何新社,等.2008年5月12日汶川MS8.0地震甘肃强震记录与初步分析[J].西北地震学报,2008,30(3):266-269.Liu X Z,Yao K,He X S,et al.The Strong Motion Records in Gansu Province for Wenchuan MS8.0Earthquake on May12,2008,and Preliminary Analysis[J].Northwestern Seismological Journal,2008,30(3):266-269.(in Chinese)
[6]温瑞智,周正华,李小军,等.汶川MS8 .0地震的强余震流动观测[J].地震学报,2009,31(2):219-225.Wen R Z,Zhou Z H,Li X J,et al.Strong Ground Motion Observation for Wenchuan Aftershocks[J].Acta Seismologica Sinica,2009,31(2):219-225.(in Chinese)
[7]何少林,闵祥仪,何新社.2002年12月17日玉门ML4 .5地震的强震仪多条记录资料分析[J].西北地震学报,2004,16(9):274-279.He S L,Min X Y,He X S.Analysis on Records of Strong Motion Accelerograph inYumen ML4 .5Earthquake on Dec.17 ,2002[J].Northwestern Seismological Journal,2004,16(9):274-279.(in Chinese)
[8]闵祥仪,姚凯,何新社.2003年10月25日甘肃省民乐—山丹MS6 .1地震强震动近场记录和分析[J].西北地震学报,2003,25(4):289-292.Min X Y,Yao K,He X S.Strong Motion Records and Preliminary Analysis for Minle-Shandan MS6.1Earthquake onOct.25,2003,Gansu Province[J].Northwestern Seismological Journal,2003,25(4):289-292.(in Chinese)
[9]姚凯,孙崇绍,朱珊珊,等.2008年汶川地震后的三次强余震地表峰值加速度衰减场研究[J].西北地震学报,2012,34(1):99-104.Yao K,Sun C S,Zhu S S,et al.Study on PGA Attenuation of Three Strong Aftershocks of Wenchuan Earthquake[J].Northwestern Seismological Journal,2012,34(1):99-104.(in Chinese)
[10]赵雯佳,徐平,林向东,等.2011年10月12日北京市石景山区ML2.1地震近场加速度记录初步分析[J].地震工程学报,2013,35(1):183-189.Zhao W J,Xu P,Lin X D,et al.Near-field Acceleration Records and Preliminary Analysis of ML2.1Shijingshan District Earthquake on Oct.12,2011,Beijing[J].China Earthquake Engineering Journal,2013,35(1):183-189.(in Chinese)
[11]俞瑞芳,俞言祥,肖亮,等.利用国家数字地震台网记录计算汶川地震余震峰值加速度分布图[J].国际地震动态,2008,(6):4-8.Yu R F,Yu Y X,Xiao L,et al.Mapping PGA Contours from China National Digital Seismic Network Records[J].Recent Developments in World Seismology,2008,(6):4-8.(in Chinese)
[12]谭继强,丁明柱.空间数据插值方法的评价[J].测绘与空间地理信息,2004,27(4):11-13.Tan J Q,Ding M Z.An Evaluation of Spatial Data Interpolation Methods[J].Geomatics and Spatial Information Technology,2004,27(4):11-13.(in Chinese)
[13]李山有,金星,陈先,等.地震动强度与地震烈度速报研究[J].地震工程与工程振动,2002,22(6):2-8.Li S Y,Jin X,Chen X,et al.Rapid Reporting of Peak Strong Motion and Seismic Intensity[J].Earthquake Engineering and Engineering Vibration,2002,22(6):2-8.(in Chinese)
[14]温瑞智,周宝峰,史大成,等.日本MW9 .0强震动观测与记录初步分析[J].国际地震动态,2011,(4):16-22.Wen R Z,Zhou B F,Shi D C,et al.The Strong Ground Motion Observation and Data Analysis for off the Pacific Coast of Tohoku Earthquake MW9 .0[J].Recent Developments in World Seismology,2011,(4):16-22.(in Chinese)
[2]胡聿贤.地震工程学[M].北京,地震出版社,2006.Hu Y X.Earthquake Engineering[M].Beijing:Seismological Press,2006.(in Chinese)
[3]谢礼立,于双久.强震观测与分析原理[M].北京,地震出版社,1982.Xie L L,Yu S J.Strong Motion Observation and Analysis Principle[M].Beijing:Seismological Press,1982.(in Chinese)
[4]周朝晖.2008年四川汶川8.0级地震强震动台网观测记录[J].四川地震,2008,4:25-29.Zhou Z H.The Strong Ground Motion Recordings of the M8.0Wenchuan Earthquake in Sichuan Province[J].Earthquake Research in Sichuan,2008,4:25-29.(in Chinese)
[5]刘旭宙,姚凯,何新社,等.2008年5月12日汶川MS8.0地震甘肃强震记录与初步分析[J].西北地震学报,2008,30(3):266-269.Liu X Z,Yao K,He X S,et al.The Strong Motion Records in Gansu Province for Wenchuan MS8.0Earthquake on May12,2008,and Preliminary Analysis[J].Northwestern Seismological Journal,2008,30(3):266-269.(in Chinese)
[6]温瑞智,周正华,李小军,等.汶川MS8 .0地震的强余震流动观测[J].地震学报,2009,31(2):219-225.Wen R Z,Zhou Z H,Li X J,et al.Strong Ground Motion Observation for Wenchuan Aftershocks[J].Acta Seismologica Sinica,2009,31(2):219-225.(in Chinese)
[7]何少林,闵祥仪,何新社.2002年12月17日玉门ML4 .5地震的强震仪多条记录资料分析[J].西北地震学报,2004,16(9):274-279.He S L,Min X Y,He X S.Analysis on Records of Strong Motion Accelerograph inYumen ML4 .5Earthquake on Dec.17 ,2002[J].Northwestern Seismological Journal,2004,16(9):274-279.(in Chinese)
[8]闵祥仪,姚凯,何新社.2003年10月25日甘肃省民乐—山丹MS6 .1地震强震动近场记录和分析[J].西北地震学报,2003,25(4):289-292.Min X Y,Yao K,He X S.Strong Motion Records and Preliminary Analysis for Minle-Shandan MS6.1Earthquake onOct.25,2003,Gansu Province[J].Northwestern Seismological Journal,2003,25(4):289-292.(in Chinese)
[9]姚凯,孙崇绍,朱珊珊,等.2008年汶川地震后的三次强余震地表峰值加速度衰减场研究[J].西北地震学报,2012,34(1):99-104.Yao K,Sun C S,Zhu S S,et al.Study on PGA Attenuation of Three Strong Aftershocks of Wenchuan Earthquake[J].Northwestern Seismological Journal,2012,34(1):99-104.(in Chinese)
[10]赵雯佳,徐平,林向东,等.2011年10月12日北京市石景山区ML2.1地震近场加速度记录初步分析[J].地震工程学报,2013,35(1):183-189.Zhao W J,Xu P,Lin X D,et al.Near-field Acceleration Records and Preliminary Analysis of ML2.1Shijingshan District Earthquake on Oct.12,2011,Beijing[J].China Earthquake Engineering Journal,2013,35(1):183-189.(in Chinese)
[11]俞瑞芳,俞言祥,肖亮,等.利用国家数字地震台网记录计算汶川地震余震峰值加速度分布图[J].国际地震动态,2008,(6):4-8.Yu R F,Yu Y X,Xiao L,et al.Mapping PGA Contours from China National Digital Seismic Network Records[J].Recent Developments in World Seismology,2008,(6):4-8.(in Chinese)
[12]谭继强,丁明柱.空间数据插值方法的评价[J].测绘与空间地理信息,2004,27(4):11-13.Tan J Q,Ding M Z.An Evaluation of Spatial Data Interpolation Methods[J].Geomatics and Spatial Information Technology,2004,27(4):11-13.(in Chinese)
[13]李山有,金星,陈先,等.地震动强度与地震烈度速报研究[J].地震工程与工程振动,2002,22(6):2-8.Li S Y,Jin X,Chen X,et al.Rapid Reporting of Peak Strong Motion and Seismic Intensity[J].Earthquake Engineering and Engineering Vibration,2002,22(6):2-8.(in Chinese)
[14]温瑞智,周宝峰,史大成,等.日本MW9 .0强震动观测与记录初步分析[J].国际地震动态,2011,(4):16-22.Wen R Z,Zhou B F,Shi D C,et al.The Strong Ground Motion Observation and Data Analysis for off the Pacific Coast of Tohoku Earthquake MW9 .0[J].Recent Developments in World Seismology,2011,(4):16-22.(in Chinese)
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