用近场余震观测资料研究张北地震的发震构造
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摘要
本文对张北近场地震资料进行了重新定位,并通过网格化处理得到震源空间分布图像、发震时间图像和定位残差图像.震源空间分布图像和发震时间图像细致地显示了极震区周围的发震构造时空特征为明显的北西方向,另外还存在断续的北东向特征.该震区在中新生代以来有过多期岩浆活动,极震区米家沟附近有一个火山口并且地壳内存在低速带和深断裂,复杂的地壳构造为孕震提供了必要的深部环境.
In this paper,near field earthquake records of Zhangbei earthquake region are relocated.Image of hypocenter distribution,image of origin time and image of locating error are obtained by gridding method.Image of hypocenter distribution and image of origin time show that the temporal-spatial feature of the seismogenic structure in Zhangbei earthquake region is obviously in NW-striking direction and it also has NE-striking discontinuously.There were multiphase magmations during Meso-Cenozoic in Zhangbei earthquake region and mezoseismal area-Mijiagou has a crater.And low-velocity zone and deep fault exist in crust.Complicated crust tectonics provide deep environment in the formation of seismogenic structure.
In this paper,near field earthquake records of Zhangbei earthquake region are relocated.Image of hypocenter distribution,image of origin time and image of locating error are obtained by gridding method.Image of hypocenter distribution and image of origin time show that the temporal-spatial feature of the seismogenic structure in Zhangbei earthquake region is obviously in NW-striking direction and it also has NE-striking discontinuously.There were multiphase magmations during Meso-Cenozoic in Zhangbei earthquake region and mezoseismal area-Mijiagou has a crater.And low-velocity zone and deep fault exist in crust.Complicated crust tectonics provide deep environment in the formation of seismogenic structure.
引文
[1]张国民,李丽,焦明若.张北6.2级地震与强震成组活动[J].地震,1999,19(2):107~117.
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[13]Gaillot P,Darrozes J,Courjault R P,Amorese D.Structuralanalysis of hypocentral distribution of an earthquake sequenceusing anisotropic wavelets:method and application[J].J.Geophys.Res.2002.107(B10):ESE3,1~14.
[14]Chapman M C,Powell C A,Vlahovic G,Sibol M S.A sta-tistical analysis of earthquake focal mechanisms and epicenterlocation in the Eastern Tennessee Seismic Zone[J].Bull.Seism.Soc.Am.1997,87(6):1522~1536.
[15]车用太,刘五洲,王基华,等.张北—尚义地震典型地段的地表破坏[J].地震地质,1998,20(2):179~182.
[16]祝治平,张建狮,张先康等.张北—尚义地震区壳幔构造[J].中国地震,1999,15(1):65~73.
[17]赖晓玲,张先康,成双喜等.张家口—渤海断裂带西缘壳幔过渡带研究[J].地球物理学报,2004,47(5):798~804.
[18]徐杰,宋长青,楚全芝.1998.张家口—蓬莱断裂带地震构造特征的初步探讨[J].地震地质,20(2):146~154.
[2]徐锡伟,冉勇康,周本刚,等.张北—尚义地震的地震构造环境与宏观破坏特征[J].地震地质,1998,20(2):135~145.
[3]王超,刘智,张红,等.张北-尚义地震同震形变场雷达差分干涉测量[J].科学通报,2000,45(23):2550~2554.
[4]刁桂苓,蔡华昌,刁建新,等.1998年张北6.2级地震宏观烈度[J].华北地震科学,2001,19(1):32~30.
[5]赖晓玲,孙译.中国大陆东部强震区和火山区人工地震探测研究综述[J].地球物理学进展,2006.21(3):722~729.
[6]高景春,刁桂苓,张四昌,等.以震源精确定位结果分析张北地震序列的破裂特征[J].地震地质,2002,24(1):81~90.
[7]石金虎,赖晓玲,段永红,等.张北地震近场观测资料的初步解释[J].中国地震,1999,15(2):151~158.
[8]赖晓玲,李松林,张先康,等.张北地震区三维构造特征[J].地学前缘,2002,9(4):383~388.
[9]赖晓玲,张先康,李松林.张北近场资料处理及震源区地震分布三维图像[J].地球物理学进展,2002,17(1):,61~70.
[10]刘若新,孙建中,樊祺城,等.新生代岩浆分布.马杏垣主编.中国岩石圈动力学地图集[M].北京:中国地图出版社,1989.
[11]杨理华,刘德林,赵喜柱,等.北京、天津、河北地震构造.马杏垣主编.中国岩石圈动力学地图集[M].北京:中国地图出版社,1989.
[12]Amorese D,Lagarde J L,Laville E.A point pattern analysisof the distribution of earthquakes in Normandy(France)[J].Bull.Seism.Soc.Am.1999,89(3):742~749.
[13]Gaillot P,Darrozes J,Courjault R P,Amorese D.Structuralanalysis of hypocentral distribution of an earthquake sequenceusing anisotropic wavelets:method and application[J].J.Geophys.Res.2002.107(B10):ESE3,1~14.
[14]Chapman M C,Powell C A,Vlahovic G,Sibol M S.A sta-tistical analysis of earthquake focal mechanisms and epicenterlocation in the Eastern Tennessee Seismic Zone[J].Bull.Seism.Soc.Am.1997,87(6):1522~1536.
[15]车用太,刘五洲,王基华,等.张北—尚义地震典型地段的地表破坏[J].地震地质,1998,20(2):179~182.
[16]祝治平,张建狮,张先康等.张北—尚义地震区壳幔构造[J].中国地震,1999,15(1):65~73.
[17]赖晓玲,张先康,成双喜等.张家口—渤海断裂带西缘壳幔过渡带研究[J].地球物理学报,2004,47(5):798~804.
[18]徐杰,宋长青,楚全芝.1998.张家口—蓬莱断裂带地震构造特征的初步探讨[J].地震地质,20(2):146~154.
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