粤西沿海震动图的生成和研究
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摘要
震动图是描绘地震产生的地面运动和可能破坏情况的有效工具,主要包括峰值地面速度(PGV)等值线图、峰值地面加速度(PGA)等值线图和仪器烈度分布图等。基于华南数字地震台网记录到的2010年7月9日MS3.7级阳江地震的数据资料,利用SAC和GMT软件从记录到的地震波形数据提取地面运动参数,生成了PGV和PGA等值线图,并用经验分级关系得到了仪器烈度分布图。结果显示,阳东地震台站(YGD)具有最大的PGV和PGA值,仪器烈度达到4度,等烈度区在陆区呈近南北向的半椭圆形分布。计算方法和研究结果对于在粤西沿海地区快速生成震动图和实现地震烈度速报具有重要作用和意义,同时为该地区抗震设防、地震危险性分析等研究提供基础资料。
Shaking maps are effective tools to describe ground motion and potential damage resulted from an earthquake,which include maps of Peak Ground Velocity(PGV),Peak Ground Acceleration(PGA) and instrumental intensity.Based on the MS3.7 earthquake occurred in Yangjiang area and recorded by the digital seismic network of South China on July 9,2010,we used SAC and GMT to generate equivalent maps of PGV and PGA via ground motion parameters extracted from the recorded seismic waveform data.Then,this paper constructed the map of instrumental intensity from empirical table relations.The results show that Yangdong area has the biggest PGV and PGA,with an instrumental intensity degree of 4.The shape of the intensity contours on land looked like a half oval in near north-south direction.The calculation methods and research results of this paper have an important effect and a significant meaning on the shaking map generation and earthquake intensity rapid report in the western coast of Guangdong province.They also provide basic data for seismic fortification and seismic risk analysis in this area.
Shaking maps are effective tools to describe ground motion and potential damage resulted from an earthquake,which include maps of Peak Ground Velocity(PGV),Peak Ground Acceleration(PGA) and instrumental intensity.Based on the MS3.7 earthquake occurred in Yangjiang area and recorded by the digital seismic network of South China on July 9,2010,we used SAC and GMT to generate equivalent maps of PGV and PGA via ground motion parameters extracted from the recorded seismic waveform data.Then,this paper constructed the map of instrumental intensity from empirical table relations.The results show that Yangdong area has the biggest PGV and PGA,with an instrumental intensity degree of 4.The shape of the intensity contours on land looked like a half oval in near north-south direction.The calculation methods and research results of this paper have an important effect and a significant meaning on the shaking map generation and earthquake intensity rapid report in the western coast of Guangdong province.They also provide basic data for seismic fortification and seismic risk analysis in this area.
引文
[1]金星,张红才,韦永祥,等.基于地震监测台网资料近实时插值计算震动图的初步研究[J].防灾减灾学报,2010,26(1):1-11.
[2]张红才.基于地震监测台网资料的震动图及震动烈度研究[D].中国地震局工程力学研究所.2008.
[3]Wald,D.J.,Quitoriano,V.,Heaton,T.H.,et al.TriNet"ShakeMaps":Rapid Generation of Peak GroundMotion and Intensity Maps for Earthquakes in Southern California[J].Earthquake Spectra,1999a,15(3):537-555.
[4]Wald,D.J.,Worden,B.C.,Quitoriano,V.,et al.ShakeMap Manual:Technical Manual,User Guide,andSoftware Guide[R].U.S.Geological surrey,2006.
[5]Wald,D.J.,Quitoriano,V.,Heaton,T.H.,et al.Relationships between peak ground acceleration,peak groundvelocity and Modified Mercalli Intensity in California[J].Earthquake Spectra,1999,15(3):557~564.
[6]泽仁志玛,陈会忠,何加勇,等.震动图快速生成系统研究[J].地球物理学进展.2006,21(3):809-813.
[7]陈鲲,俞言祥,高孟潭.考虑场地效应的Shakemap系统研究[J].中国地震,2010,26(1):92-102.
[8]陈鲲,俞言祥,高孟潭.2010年4月14日青海玉树地震震动图[J].中国地震,2011,27(1):99-102.
[9]陈鲲,俞言祥,高孟潭,等.考虑震源破裂过程的青海玉树地震震动图研究[J].中国地震,2011,27(1):56-64.
[10]Tapley,W.C.,Tull,J.E.SAC-Seismic Analysis Code Uesrs Manual[R].Regents of the Uinversity of California,1991.
[11]Wessel,P.,Smith,W.H.F.New version of the Generic Mapping Tools released[J].EOS Trans.AGU2011,76(33):329.
[12]钟贻军,任镇寰.1969年阳江6.4级地震发震构造研究[J].大地测量与地球动力学,2003,23(4):92~98.
[13]吕金水,叶春明,黄剑涛,等.广东数字遥测地震台网的建设[J].华南地震,2000,20(4):2-15.
[14]吴华灯,黄文辉.广东地震台网测震数据库管理系统[J].华南地震,2006,26(2):66-71.
[15]康英,吕金水,杨选,等.广东新地震参数目录的编制[J].华南地震,2010,30(S0):19-26.
[16]陈贵美,康英,杨选.广东“十五”数字测震台网地震监测能力分析[J].华南地震,2011,31(3):70~77.
[17]广东省台山市阳东县交界发生3.7级地震[EB/OL].http://www.chinanews.com/gn/2010/07-09/2393614.shtml.
[18]中国地震台网统一地震目录[EB/OL].http://data.earthquake.cn/data/
[19]金星,张红才,韦永祥.基于地震台网资料快速发布的震动烈度标准及其应用研究[J].国际地震动态,2008,(10):20-27.
[20]Buland R.,Chapman C.H.The computation of seismic travel times[J].BSSA,1983,73:1271-1320.
[21]Smith,W.H.F.,Wessel P.Gridding with continuous curvature splines in tension[J].Geophysics.1990,55(3):293-305.
[22]郝敏,谢礼立,徐龙军.关于地震烈度物理标准研究的若干思考[J].地震学报,2005,27(2):230～234.
[23]郝敏.地震烈度物理标准及地震动破坏势研究[D].哈尔滨:哈尔滨工业大学,2006.
[24]徐辉龙,丘学林,赵明辉,等.南海东北部南澳大地震(7.5)震中区的地壳结构特征与震源构造[J].4期科学通报,2006,51(SII):83-91.
[25]魏柏林,陈仁法,黄日恒,等.广东省地震构造图集[M].北京:地震出版社,2000.
[26]叶秀薇,闻则刚,邱奕超,等.2004年阳江4.9级地震破裂方位角研究[J].大地测量与地球动力学,2006,26(4):102~106.
[27]叶秀薇,杨马陵,叶东华,等.2004年9月17日阳江4.9级地震概述[J].华南地震,2005,25(3):69~77.
[28]Moratto,L.,Costa,G.,Suhadolc,P.Real-time generation of ShakeMaps in the Southeastern Alps[J].BSSA,2009,99(4):2489~2501.
[29]Moratto,L.,Suhadolc,P.,Costa,G.ShakeMaps for three relevant earthquakes in the Southeastern Alps:Comparison between instrumental and observed intensities[J].Tectonophysics,2011,509:93-106.
①阳江市地震局,阳东县与台山市交界3.7级强有感地震调查报告.2010.
[2]张红才.基于地震监测台网资料的震动图及震动烈度研究[D].中国地震局工程力学研究所.2008.
[3]Wald,D.J.,Quitoriano,V.,Heaton,T.H.,et al.TriNet"ShakeMaps":Rapid Generation of Peak GroundMotion and Intensity Maps for Earthquakes in Southern California[J].Earthquake Spectra,1999a,15(3):537-555.
[4]Wald,D.J.,Worden,B.C.,Quitoriano,V.,et al.ShakeMap Manual:Technical Manual,User Guide,andSoftware Guide[R].U.S.Geological surrey,2006.
[5]Wald,D.J.,Quitoriano,V.,Heaton,T.H.,et al.Relationships between peak ground acceleration,peak groundvelocity and Modified Mercalli Intensity in California[J].Earthquake Spectra,1999,15(3):557~564.
[6]泽仁志玛,陈会忠,何加勇,等.震动图快速生成系统研究[J].地球物理学进展.2006,21(3):809-813.
[7]陈鲲,俞言祥,高孟潭.考虑场地效应的Shakemap系统研究[J].中国地震,2010,26(1):92-102.
[8]陈鲲,俞言祥,高孟潭.2010年4月14日青海玉树地震震动图[J].中国地震,2011,27(1):99-102.
[9]陈鲲,俞言祥,高孟潭,等.考虑震源破裂过程的青海玉树地震震动图研究[J].中国地震,2011,27(1):56-64.
[10]Tapley,W.C.,Tull,J.E.SAC-Seismic Analysis Code Uesrs Manual[R].Regents of the Uinversity of California,1991.
[11]Wessel,P.,Smith,W.H.F.New version of the Generic Mapping Tools released[J].EOS Trans.AGU2011,76(33):329.
[12]钟贻军,任镇寰.1969年阳江6.4级地震发震构造研究[J].大地测量与地球动力学,2003,23(4):92~98.
[13]吕金水,叶春明,黄剑涛,等.广东数字遥测地震台网的建设[J].华南地震,2000,20(4):2-15.
[14]吴华灯,黄文辉.广东地震台网测震数据库管理系统[J].华南地震,2006,26(2):66-71.
[15]康英,吕金水,杨选,等.广东新地震参数目录的编制[J].华南地震,2010,30(S0):19-26.
[16]陈贵美,康英,杨选.广东“十五”数字测震台网地震监测能力分析[J].华南地震,2011,31(3):70~77.
[17]广东省台山市阳东县交界发生3.7级地震[EB/OL].http://www.chinanews.com/gn/2010/07-09/2393614.shtml.
[18]中国地震台网统一地震目录[EB/OL].http://data.earthquake.cn/data/
[19]金星,张红才,韦永祥.基于地震台网资料快速发布的震动烈度标准及其应用研究[J].国际地震动态,2008,(10):20-27.
[20]Buland R.,Chapman C.H.The computation of seismic travel times[J].BSSA,1983,73:1271-1320.
[21]Smith,W.H.F.,Wessel P.Gridding with continuous curvature splines in tension[J].Geophysics.1990,55(3):293-305.
[22]郝敏,谢礼立,徐龙军.关于地震烈度物理标准研究的若干思考[J].地震学报,2005,27(2):230～234.
[23]郝敏.地震烈度物理标准及地震动破坏势研究[D].哈尔滨:哈尔滨工业大学,2006.
[24]徐辉龙,丘学林,赵明辉,等.南海东北部南澳大地震(7.5)震中区的地壳结构特征与震源构造[J].4期科学通报,2006,51(SII):83-91.
[25]魏柏林,陈仁法,黄日恒,等.广东省地震构造图集[M].北京:地震出版社,2000.
[26]叶秀薇,闻则刚,邱奕超,等.2004年阳江4.9级地震破裂方位角研究[J].大地测量与地球动力学,2006,26(4):102~106.
[27]叶秀薇,杨马陵,叶东华,等.2004年9月17日阳江4.9级地震概述[J].华南地震,2005,25(3):69~77.
[28]Moratto,L.,Costa,G.,Suhadolc,P.Real-time generation of ShakeMaps in the Southeastern Alps[J].BSSA,2009,99(4):2489~2501.
[29]Moratto,L.,Suhadolc,P.,Costa,G.ShakeMaps for three relevant earthquakes in the Southeastern Alps:Comparison between instrumental and observed intensities[J].Tectonophysics,2011,509:93-106.
①阳江市地震局,阳东县与台山市交界3.7级强有感地震调查报告.2010.
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