豫北深、浅部构造特征与地震
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摘要
通过对豫北地区浅层和深部地震地质构造特征及地震活动性的综合分析 ,以薄壁—新乡—商丘断裂带为界 ,划分为北部地区和南部地区 ,并分别进行了论述。认为北部地区构造线主体为北东向 ,与华北断块区的构造线一致 ,浅层构造沿区域构造线呈断隆和断陷相间展布 ,深部莫霍界面隆起凹陷也相间排列。南部地区的主体构造线基本为北西向 ,与北部地区截然不同 ,浅层构造豫东为在整体沉降的基础上有次级的隆起和凹陷 ,深部结构表现为大面积的莫霍面隆起 ,其上又有次级的凹陷存在。豫西块体则是整体隆起 ,断裂是主要的构造形式 ,并控制着一系列断陷盆地的形成和演化 ,深部莫霍面凹陷。根据本区历史和现代地震 ,结合浅层构造和深部结构 ,认为汤阴地堑与三门峡 -灵宝盆地存在发生中强地震的危险。
By comprehensively analyzing the deep and shallow tectonic features of seismogeology and seismic activity in North Henan,the region is divided into the northern area and the southern area at the boundary,Bobi Xinxiang Shangqiu fault belt,and the two areas are separately discussed.In the northern area,the main tectonic line is NE direction,which is identical with the tectonic line in North China fault block region,the shallow tectonic presents fault uprise alternating with fault depression along the direction of regional tectonic line,and the Moho shows upwarping alternating with depression.In the southern area,the main tectonic line is basically NW direction,which is completely different from that in the northern area,the shallow tectonic in East Henan includes the secondary uprise and depression on the basis of whole subsidence,and deep structures show the large scale Moho upwarping where there are secondary depressions.West Henan block shows the whole uprise,the main type of tectonics are faults,which control the formation and evolution of a series of down faulted basins,and the Moho is depressed.Acording to historical and modern earthquakes and combined with the shallow tectonic and deep structure,it is thought that there are risks for occurrence of moderate and strong earthquakes in Tangyin graben and Sanmenxia Lingbao basin.
By comprehensively analyzing the deep and shallow tectonic features of seismogeology and seismic activity in North Henan,the region is divided into the northern area and the southern area at the boundary,Bobi Xinxiang Shangqiu fault belt,and the two areas are separately discussed.In the northern area,the main tectonic line is NE direction,which is identical with the tectonic line in North China fault block region,the shallow tectonic presents fault uprise alternating with fault depression along the direction of regional tectonic line,and the Moho shows upwarping alternating with depression.In the southern area,the main tectonic line is basically NW direction,which is completely different from that in the northern area,the shallow tectonic in East Henan includes the secondary uprise and depression on the basis of whole subsidence,and deep structures show the large scale Moho upwarping where there are secondary depressions.West Henan block shows the whole uprise,the main type of tectonics are faults,which control the formation and evolution of a series of down faulted basins,and the Moho is depressed.Acording to historical and modern earthquakes and combined with the shallow tectonic and deep structure,it is thought that there are risks for occurrence of moderate and strong earthquakes in Tangyin graben and Sanmenxia Lingbao basin.
引文
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5 杜广仁 .豫北地区地震活动性及其与区域地壳运动的关系 .地震研究 ,1 993 ,1 6.1 82～ 87
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2 任青芳 ,张先康 ,张成科 ,赵金仁 ,周雪松 .汤阴地堑及邻区的壳幔结构与地震危险性 ,中国地震 ,1 998,1 4 ( 2 ) :1 57—1 65
3 张成科 ,赵金仁 ,任青芳 ,张先康 ,祝治平 .豫北及其外围地区地壳上地幔结构研究 ,地震地质 ,1 994 ,1 6( 2 ) :1 7— 2 4
4 姚法章 .从构造特征看冀鲁豫交界区的强震危险性 .华北地震科学 ,1 987,5( 2 ) :1 0 9～ 1 1 5.
5 杜广仁 .豫北地区地震活动性及其与区域地壳运动的关系 .地震研究 ,1 993 ,1 6.1 82～ 87
6 冯兴祥 ,阎海观 .从地质构造探讨河南省潜在震源区的划分。河南地球物理论文集 ,郑州 :河南科学技术出版社 ,1 993 .1 3 7～ 1 4 5
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