2014年云南鲁甸M_S6.5地震峰值加速度震动图
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摘要
综合考虑震中地区地质构造背景、震源机制解结果、余震分布以及我国西部地区地震动参数衰减特征,运用考虑场地效应的震动图快速生成方法,将收集到的62组强震台站的峰值加速度作为插值使用,估计了2014年8月3日云南鲁甸MS6.5地震峰值加速度震动图.利用地震后获得的强震记录计算了强震台站观测值与借助经验性衰减关系得到的估计值之间的系统偏差,校正了缺少台站地区借助经验性衰减关系得到的估计值,获得了校正后的峰值加速度分布图.结果显示,鲁甸MS6.5地震的地震动峰值加速度随距离的衰减速度比前人对我国西部衰减统计的结果更快,对数偏差校正的结果更符合本次地震的衰减规律.校正后的峰值加速度大于40cm/s2的区域面积近8 000km2,比未经校正的峰值加速度大于40cm/s2的面积减小了40%左右.
Considering the geological structure background,focal mechanism solutions,aftershock distribution and attenuation characteristics of the ground motion in western China,ShakeMap of peak ground acceleration(PGA)for the Ludian,Yunnan,MS6.5earthquake on 3August 2014 was acquired,in which the method of rapid generation ShakeMaps considering site effects was used,and the PGAs of 62 strong motion stations for this earthquake were used as interpolation.Then,distribution of PGA was amended by using PGA observations to correct system bias of theoretical estimates in the area without PGA observations.The results show that the attenuation of ground motion with distance for the Ludian MS6.5earthquake was faster than that from previous studies on western China.The result by correction for bias in logarithmic regression was more consistent with attenuation law for this earthquake.The area with corrected PGA greater than 40cm/s2 was nearly 8 000km2,which was reduced by about 40% compared with that of uncorrected.
Considering the geological structure background,focal mechanism solutions,aftershock distribution and attenuation characteristics of the ground motion in western China,ShakeMap of peak ground acceleration(PGA)for the Ludian,Yunnan,MS6.5earthquake on 3August 2014 was acquired,in which the method of rapid generation ShakeMaps considering site effects was used,and the PGAs of 62 strong motion stations for this earthquake were used as interpolation.Then,distribution of PGA was amended by using PGA observations to correct system bias of theoretical estimates in the area without PGA observations.The results show that the attenuation of ground motion with distance for the Ludian MS6.5earthquake was faster than that from previous studies on western China.The result by correction for bias in logarithmic regression was more consistent with attenuation law for this earthquake.The area with corrected PGA greater than 40cm/s2 was nearly 8 000km2,which was reduced by about 40% compared with that of uncorrected.
引文
陈鲲,俞言祥,高孟潭.2010.考虑场地效应的ShakeMap系统研究[J].中国地震,26(1):92--102.Chen K,Yu Y X,Gao M T.2010.Research on ShakeMap system in terms of the site effect[J].Earthquake Research inChina,26(1):92--102(in Chinese).
陈鲲,俞言祥,高孟潭,冯静.2012.用有限强地震动记录校正等震线的估计研究[J].地震学报,34(5):633--645.Chen K,Yu Y X,Gao M T,Feng J.2012.Study on bias correction of ShakeMaps based on limited acceleration records[J].Acta Seismologica Sinica,34(5):633--645(in Chinese).
陈鲲,俞言祥,高孟潭.2013a.基于地震记录的震动图校正方法研究[J].应用基础与工程科学学报,21(4):679--691.Chen K,Yu Y X,Gao M T.2013a.Research on correction method for ShakeMap based on seismic data[J].Journal ofBasic Science and Engineering,21(4):679--691(in Chinese).
陈鲲,俞言祥,高孟潭,高景春.2013b.利用强震记录校正的芦山7.0级地震峰值加速度震动图[J].地震地质,35(3):627--633.Chen K,Yu Y X,Gao M T,Gao J C.2013b.ShakeMap of peak ground acceleration with bias correction for the Lushan,Sichuan earthquake on April 20,2013[J].Seismology and Geology,35(3):627--633(in Chinese).
国家质量技术监督局.2001.中国地震动参数区划图(GB/T 18306—2001)[S].北京:中国标准出版社:1.General Administration of Quality Supervision of the People’s Republic of China.2001.Seismic Ground Motion Parameter Zonation Map of China(GB/T18306—2001)[S].Beijing:China Standards Press:1(in Chinese).
汪素云,俞言祥,高阿甲,阎秀杰.2000.中国分区地震动衰减关系的确定[J].中国地震,16(2):99--106.Wang S Y,Yu Y X,Gao A J,Yan X J.2000.Development of attenuation relations for ground motion in China[J].Earthquake Research in China,16(2):99--106(in Chinese).
徐锡伟,于贵华.2014.云南鲁甸(北纬27.1度,东经103.3度)6.5级地震发震构造图[EB/OL].[2014-08-03].http:∥www.eq-igl.ac.cn/admin/upload/files/云南6_5级地震发震构造图0805.TIF.Xu X W,Yu G H.2014.Picture of seismogenic structure for Ludian MS6.5earthquake(27.1°N,103.3°E),YunnanProvince[EB/OL].[2014-08-03].http:∥www.eq-igl.ac.cn/admin/upload/files/云南6_5级地震发震构造图0805.TIF.
中国地震局地球物理研究所.2014.2014年8月3日云南鲁甸6.5级地震[EB/OL].[2014-08-03].http:∥www.ceaigp.ac.cn/tpxw/270724.shtml.Institute of Geophysics,China Earthquake Administration.2014.Ludian MS6.5earthquake on 3August 2014,YunnanProvince[EB/OL].[2014-08-03].http:∥www.cea-igp.ac.cn/tpxw/270724.shtml.
Allen T I,Wald D J.2007.TopographicSlopeasaProxyforSeismicSiteConditions(v30S)and Amplification Aroundthe Globe[R].U S Geological Survey Open-File Report 2007-1357:69.
Allen T I,Wald D J.2009.On the use of high-resolution topographic data as a proxy for seismic site conditions(v30S)[J].Bull Seismol Soc Am,99(2A):935--943.
Borcherdt R D.1994.Estimates of site-dependent response spectra for design(methodology and justification)[J].EarthqSpectra,10(4):617--653.
USGS.2014.M6.1-11km W of Wenping,China[EB/OL].[2014-02-12].http:∥earthquake.usgs.gov/earthquakes/eventpage/usb000rzmg#scientific.
Wald D J,Worden B C,Quitoriano V,Pandow K L.2006.ShakeMap Manual:Technical Manual,User’s Guide,andSoftware Guide[R].U S Geological Survey:156.
Wald D J,Allen T I.2007.Topographic slope as a proxy for seismic site conditions and amplification[J].Bull SeismolSoc Am,97(5):1379--1395.
陈鲲,俞言祥,高孟潭,冯静.2012.用有限强地震动记录校正等震线的估计研究[J].地震学报,34(5):633--645.Chen K,Yu Y X,Gao M T,Feng J.2012.Study on bias correction of ShakeMaps based on limited acceleration records[J].Acta Seismologica Sinica,34(5):633--645(in Chinese).
陈鲲,俞言祥,高孟潭.2013a.基于地震记录的震动图校正方法研究[J].应用基础与工程科学学报,21(4):679--691.Chen K,Yu Y X,Gao M T.2013a.Research on correction method for ShakeMap based on seismic data[J].Journal ofBasic Science and Engineering,21(4):679--691(in Chinese).
陈鲲,俞言祥,高孟潭,高景春.2013b.利用强震记录校正的芦山7.0级地震峰值加速度震动图[J].地震地质,35(3):627--633.Chen K,Yu Y X,Gao M T,Gao J C.2013b.ShakeMap of peak ground acceleration with bias correction for the Lushan,Sichuan earthquake on April 20,2013[J].Seismology and Geology,35(3):627--633(in Chinese).
国家质量技术监督局.2001.中国地震动参数区划图(GB/T 18306—2001)[S].北京:中国标准出版社:1.General Administration of Quality Supervision of the People’s Republic of China.2001.Seismic Ground Motion Parameter Zonation Map of China(GB/T18306—2001)[S].Beijing:China Standards Press:1(in Chinese).
汪素云,俞言祥,高阿甲,阎秀杰.2000.中国分区地震动衰减关系的确定[J].中国地震,16(2):99--106.Wang S Y,Yu Y X,Gao A J,Yan X J.2000.Development of attenuation relations for ground motion in China[J].Earthquake Research in China,16(2):99--106(in Chinese).
徐锡伟,于贵华.2014.云南鲁甸(北纬27.1度,东经103.3度)6.5级地震发震构造图[EB/OL].[2014-08-03].http:∥www.eq-igl.ac.cn/admin/upload/files/云南6_5级地震发震构造图0805.TIF.Xu X W,Yu G H.2014.Picture of seismogenic structure for Ludian MS6.5earthquake(27.1°N,103.3°E),YunnanProvince[EB/OL].[2014-08-03].http:∥www.eq-igl.ac.cn/admin/upload/files/云南6_5级地震发震构造图0805.TIF.
中国地震局地球物理研究所.2014.2014年8月3日云南鲁甸6.5级地震[EB/OL].[2014-08-03].http:∥www.ceaigp.ac.cn/tpxw/270724.shtml.Institute of Geophysics,China Earthquake Administration.2014.Ludian MS6.5earthquake on 3August 2014,YunnanProvince[EB/OL].[2014-08-03].http:∥www.cea-igp.ac.cn/tpxw/270724.shtml.
Allen T I,Wald D J.2007.TopographicSlopeasaProxyforSeismicSiteConditions(v30S)and Amplification Aroundthe Globe[R].U S Geological Survey Open-File Report 2007-1357:69.
Allen T I,Wald D J.2009.On the use of high-resolution topographic data as a proxy for seismic site conditions(v30S)[J].Bull Seismol Soc Am,99(2A):935--943.
Borcherdt R D.1994.Estimates of site-dependent response spectra for design(methodology and justification)[J].EarthqSpectra,10(4):617--653.
USGS.2014.M6.1-11km W of Wenping,China[EB/OL].[2014-02-12].http:∥earthquake.usgs.gov/earthquakes/eventpage/usb000rzmg#scientific.
Wald D J,Worden B C,Quitoriano V,Pandow K L.2006.ShakeMap Manual:Technical Manual,User’s Guide,andSoftware Guide[R].U S Geological Survey:156.
Wald D J,Allen T I.2007.Topographic slope as a proxy for seismic site conditions and amplification[J].Bull SeismolSoc Am,97(5):1379--1395.
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