2006年7月4日文安5.1级地震
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摘要
分析了震动京津的文安地震的特点:余震微小,最大仅1.5级,属于孤立型地震;震区烈度偏低、有感范围大;宏观震中与微观震中相差10余公里;震源较深;具有较大的正断层错动分量。对此作出初步解释,并认为可能是岩石圈减薄的新证据。
Through analysis, we found that the Wen'an earthquake has the following characteristics: the aftershocks are small with the biggest of only M 1.5, belonging to the isolated type earthquake; the earthquake intensity is low, but the perceptible area is relatively large; the macro-epicenter is over 10km away from the micro-epicenter; the hypocenter is deep; and the fracture of earthquake shows a normal fault slip. The explanation for these characteristics is presented, which can be regarded as a new evidence for lithospheric thinning.
Through analysis, we found that the Wen'an earthquake has the following characteristics: the aftershocks are small with the biggest of only M 1.5, belonging to the isolated type earthquake; the earthquake intensity is low, but the perceptible area is relatively large; the macro-epicenter is over 10km away from the micro-epicenter; the hypocenter is deep; and the fracture of earthquake shows a normal fault slip. The explanation for these characteristics is presented, which can be regarded as a new evidence for lithospheric thinning.
引文
①蒋海昆,2005,国家“十五”科技攻关计划“余震序列统计特征及强余震预测研究”报告。
沧州市地震局,廊坊市地震局.2001.一九六七年河间?大城地震[M].北京:地震出版社.Earthquake Administration of Cangzhou City and Earthquake Administration of Langfang City.2001.The Hejian-Dacheng earthquake in1967[M].Seismological Press,Beijing(in Chinese).
刁桂苓,王泽皋.1988.邢台地震群中的子序列[J].地震学报,10(2):138—145.DIAO Gui-ling,WANG Ze-gao.1988.Subsequences in the Xingtai earthquakes warm[J].Acta Seismologica Sinica,10(2):138—145(in Chinese).
刁桂苓.1986.邢台MS≥5地震的时空分布及其机制[J].中国地震,2(4):67—72.DIAO Gui-ling.1986.Temporal and spatial distribution of the earthquakes(MS≥5)in Xingtai and its mechanism[J].Earthquake Research in China,2(4):67—72(in Chinese).
国家地震局科技监测司.1986.文安—霸县地壳隆起的研究[M].北京:地震出版社.1—18.Science and Technology Monitoring Department,SSB.1986.Study on Wen an-Baxian crustal upheaval[M].Seismo-logical Press,Beijing.1—18(in Chinese).
侯建明,曾炬,罗兰格.1988.1973年12月31日河北省河间5.3级地震[A].见:张肇诚主编.中国震例(1966—1975).北京:地震出版社.130—143.HOU Jian-ming,ZENG Ju,LUO Lan-ge.1988.The HejianM5.3earthquake in Hebei Province on Dec.31,1973[A].In:ZHANG Zhao-cheng(ed).Earthquake Cases in China(1966—1975).Seismological Press,Beijing.130—143(in Chinese).
胡新亮,刁桂苓,高景春,等.2001.华北、西南一些地区地震发生在地壳浅部的证据[J].地震学报,23(4):427—435.HU Xin-liang,DIAO Gui-ling,GAO Jing-chun,et al.2001.Some evidences for earthquake occurrence in the shallowcrust in some areas of North China and Southwest China[J].Acta Seismologica Sinica,14(4):456—465.
嘉世旭,张先康.2005.华北不同构造块体地壳结构及其对比研究[J].地球物理学报,48(3):611—620.JIA Shi-xu,ZHANG Xian-kang.2005.Crustal structure and comparison of different tectonic blocks in North China[J].Chinese Journal of Geophysics,48(3):672—683.
李钦祖.1980.华北地壳应力场的基本特征[J].地球物理学报,23(4):376—388.LI Qin-zu.1980.General features of the stress fields in the crust of North China[J].Chinese Journal of Geophysics,23(4):376—388(in Chinese).
徐杰,高占武,孙建宝,等.2001.区域伸展体制下盆?山构造耦合关系的探讨:以渤海湾盆地和太行山为例[J].地质学报,75(2):165—174.XU Jie,GAO Zhan-wu,SUN Jian-bao,et al.2001.A preliminary study of the coupling relationship between basin andmountain in extensional environments:A case study of the bohai bay basin and Taihang Mountains[J].ActaGeologica Sinica,75(2):165—174(in Chinese).
Jinli Huang and Dapeng Zhao.2004.Crustal heterogeneity and seismotectonics of the region around Beijing,China[J].Tectonophysics,385:159—180.
Jinli Huang and Dapeng Zhao.2006.High-resolution mantle tomography of China and surrounding regions[J].J Geo-phys Res(in press).
沧州市地震局,廊坊市地震局.2001.一九六七年河间?大城地震[M].北京:地震出版社.Earthquake Administration of Cangzhou City and Earthquake Administration of Langfang City.2001.The Hejian-Dacheng earthquake in1967[M].Seismological Press,Beijing(in Chinese).
刁桂苓,王泽皋.1988.邢台地震群中的子序列[J].地震学报,10(2):138—145.DIAO Gui-ling,WANG Ze-gao.1988.Subsequences in the Xingtai earthquakes warm[J].Acta Seismologica Sinica,10(2):138—145(in Chinese).
刁桂苓.1986.邢台MS≥5地震的时空分布及其机制[J].中国地震,2(4):67—72.DIAO Gui-ling.1986.Temporal and spatial distribution of the earthquakes(MS≥5)in Xingtai and its mechanism[J].Earthquake Research in China,2(4):67—72(in Chinese).
国家地震局科技监测司.1986.文安—霸县地壳隆起的研究[M].北京:地震出版社.1—18.Science and Technology Monitoring Department,SSB.1986.Study on Wen an-Baxian crustal upheaval[M].Seismo-logical Press,Beijing.1—18(in Chinese).
侯建明,曾炬,罗兰格.1988.1973年12月31日河北省河间5.3级地震[A].见:张肇诚主编.中国震例(1966—1975).北京:地震出版社.130—143.HOU Jian-ming,ZENG Ju,LUO Lan-ge.1988.The HejianM5.3earthquake in Hebei Province on Dec.31,1973[A].In:ZHANG Zhao-cheng(ed).Earthquake Cases in China(1966—1975).Seismological Press,Beijing.130—143(in Chinese).
胡新亮,刁桂苓,高景春,等.2001.华北、西南一些地区地震发生在地壳浅部的证据[J].地震学报,23(4):427—435.HU Xin-liang,DIAO Gui-ling,GAO Jing-chun,et al.2001.Some evidences for earthquake occurrence in the shallowcrust in some areas of North China and Southwest China[J].Acta Seismologica Sinica,14(4):456—465.
嘉世旭,张先康.2005.华北不同构造块体地壳结构及其对比研究[J].地球物理学报,48(3):611—620.JIA Shi-xu,ZHANG Xian-kang.2005.Crustal structure and comparison of different tectonic blocks in North China[J].Chinese Journal of Geophysics,48(3):672—683.
李钦祖.1980.华北地壳应力场的基本特征[J].地球物理学报,23(4):376—388.LI Qin-zu.1980.General features of the stress fields in the crust of North China[J].Chinese Journal of Geophysics,23(4):376—388(in Chinese).
徐杰,高占武,孙建宝,等.2001.区域伸展体制下盆?山构造耦合关系的探讨:以渤海湾盆地和太行山为例[J].地质学报,75(2):165—174.XU Jie,GAO Zhan-wu,SUN Jian-bao,et al.2001.A preliminary study of the coupling relationship between basin andmountain in extensional environments:A case study of the bohai bay basin and Taihang Mountains[J].ActaGeologica Sinica,75(2):165—174(in Chinese).
Jinli Huang and Dapeng Zhao.2004.Crustal heterogeneity and seismotectonics of the region around Beijing,China[J].Tectonophysics,385:159—180.
Jinli Huang and Dapeng Zhao.2006.High-resolution mantle tomography of China and surrounding regions[J].J Geo-phys Res(in press).
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