甘肃及邻近地区构造应力场特征研究及有关问题的讨论
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摘要
通过大量的实际资料，研究了甘肃及邻近地区的新构造应力场和现代构造应力场。并根据研究结果，对新构造应力场和现代构造应力场之间的继承性、随时间推移而发生的变化以及动力来源和构造应力场作用下活动断裂与地震的关系等问题进行了讨论。
Studying the Neogene folds ,asaemblage forms and structural features of Cenozoic active basins,and neotectonic stress field reflected by active faults and their mechanical properties,it is consideredthat the trajectories of neotectonic principal compressive stresses in Gansu and its adjacent areas showNE-SW in direction,and from west to east and from north to south,their directions gradually turnfrom NNE to NE,NEE up to EW.Based on the investigation,the recent crustal deformation bands due to great earthquakes andmechanism data of earthquake foci are analyzed and discussed.The results show that the dominant di-rection of principal compressive stress in tecton ic stress field is NE. In Hexi Corridor to the west of theGulang-Lanzhou Line and in the north of Qinghai-Xizang Plateau,the principal compressive stressfields show NE-SW in direction.Though there is a small error,they overall are consistent,about N35°E. On the north segment of the South-North Tectonic Belt to the east of the Gulang-Lanzhou Line,thedirection of principal compressive stress field is NE-NEE. In the region of Longxi and its south, thestress field show NEE-DE in direction . Based on the above-mentioned results.the authors discussed the inheritability between neotectonicstress field and current tectonic stress field, their changes with time and dynamic source,as well a the relationship between earthquakes and active fault under the action of tectonic stress field,etc.
Studying the Neogene folds ,asaemblage forms and structural features of Cenozoic active basins,and neotectonic stress field reflected by active faults and their mechanical properties,it is consideredthat the trajectories of neotectonic principal compressive stresses in Gansu and its adjacent areas showNE-SW in direction,and from west to east and from north to south,their directions gradually turnfrom NNE to NE,NEE up to EW.Based on the investigation,the recent crustal deformation bands due to great earthquakes andmechanism data of earthquake foci are analyzed and discussed.The results show that the dominant di-rection of principal compressive stress in tecton ic stress field is NE. In Hexi Corridor to the west of theGulang-Lanzhou Line and in the north of Qinghai-Xizang Plateau,the principal compressive stressfields show NE-SW in direction.Though there is a small error,they overall are consistent,about N35°E. On the north segment of the South-North Tectonic Belt to the east of the Gulang-Lanzhou Line,thedirection of principal compressive stress field is NE-NEE. In the region of Longxi and its south, thestress field show NEE-DE in direction . Based on the above-mentioned results.the authors discussed the inheritability between neotectonicstress field and current tectonic stress field, their changes with time and dynamic source,as well a the relationship between earthquakes and active fault under the action of tectonic stress field,etc.
引文
1国家地震局兰州地震研究所等．1920年海源大地震．北京：地震出版社，19802郭增建，张诚．1949年到1960年中国大地震的震源机制研究．地球物理学报，1962，11（1）3鄢家全等．中国及邻区现代构造应力场的区域特征，地震学报，1979．1（1）4国家地震局《鄂尔多斯周缘活动断裂系》课题组．鄂尔多斯周缘活动断裂系．北京：地震出版社，19885四川省地震局编．松潘地震预报学术讨论会文集，北京：地震出版社，19896陈爱玲等．西海固地区构造应力场特征及其与地震活动性的讨论，西北地震学报，1981，3（2）7徐纪人等．1986年8月26日门源6．4级地震及其强余震的震源机制解．西北地震学报，1986，8（4）8国家地震局震源机制研究小组．中国地震震源机制的研究．19739杨理华，李钦祖．华北地区地壳应力场．北京：地震出版社，198010MinsterJB，JordanTH．Present－dayplatemotions，J．G．1978，83：5331～535411TapponnterP，etal．TectoniccollisionbetweenIndiaandAsia，CollisionTectonic、GeologicalSpecialPublication1986（19）
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