青藏高原现今地壳运动的形变特征
|
摘要
以 GPS、大面积水准、流动重力测量、跨断层流动形变测量等方面的监测和研究成果为主 ,围绕青藏块体的运动学特征、动力学特征、震源机制以及孕震机制进行了探讨和研究。结果表明 ,印度板块对我国大陆的碰撞和挤压 ,是青藏块体隆升及其周边地区地震孕育和发生的主要动力来源。大面积水准给出的垂直形变等值线的高密度区及其形态与多年来地震地质划分出的 5个区域大体一致。区域测量显示 ,在大震孕育发生的过程中 ,异常信息的空间演化存在由西南向东北推进的特征 ,且与构造相关。文章最后提出了“坝体决口孕震模式”的新假说
On the basis of the monitoring and research results of GPS,large scale levelling,mobile gravity measurements and mobile deformation measurements across faults,the paper makes an approach to and research on the characteristics of kinematics and dynamics,focal mechanism and earthquake preparation mechanism of the Qinghai Xizang block.The results indicate that the collision and compression of the Indian block with China's mainland are the main force sources of the Qinghai Xizang block rise and earthquake preparation and occurrence of the surrounding areas.The high density regions of vertical deformation contours and their shapes presented by large scale levelling are approximately consistent with the five regions divided by seismogeology in the past years.The regional measurements show that in the process of earthquake preparation and occurrence,the spatial variation of anomaly information is characterized by moving from southwest to northeast,and it correlates with tectonics.At the end of the paper,a new hypothesis of "earthquake preparation model of energy dam failure" is presented
On the basis of the monitoring and research results of GPS,large scale levelling,mobile gravity measurements and mobile deformation measurements across faults,the paper makes an approach to and research on the characteristics of kinematics and dynamics,focal mechanism and earthquake preparation mechanism of the Qinghai Xizang block.The results indicate that the collision and compression of the Indian block with China's mainland are the main force sources of the Qinghai Xizang block rise and earthquake preparation and occurrence of the surrounding areas.The high density regions of vertical deformation contours and their shapes presented by large scale levelling are approximately consistent with the five regions divided by seismogeology in the past years.The regional measurements show that in the process of earthquake preparation and occurrence,the spatial variation of anomaly information is characterized by moving from southwest to northeast,and it correlates with tectonics.At the end of the paper,a new hypothesis of "earthquake preparation model of energy dam failure" is presented
引文
[1]郭良迁.对中国大陆地壳水平形变的初步探索.中国地震,2000,18(2):126-134
[2]马杏垣主编.中国岩石圈动力学纲要.北京:地震出版社,1987
[3]丁国瑜主编.中国岩石圈动力学概论.北京:地震出版社,1991
[4]傅容珊,黄建华,徐耀民,等.印度与欧亚板块碰撞的数值模拟和现代中国大陆形变.地震学报,2000,22(1):1-7
[5]张祖胜.利用大地形变测量资料估计我国大陆地区近几十年的地震趋势.中国地震大形势研究.北京:地震出版社,1990
[6]应绍奋,沈永坚,黄立人,等.中国大陆形变场特征及中长期地震危险性划分//国家地震局科技发展司编.中国大陆2005年前强震危险性预测研究.北京:地震出版社,1997
[7]马宗晋,汪良谋,李存悌,等.中国及邻区特大地震地质与地球物理环境和危险区划分//国家地震局科技发展司编.中国大陆2005年前强震危险性预测研究.北京:地震出版社,1997
[8]孙少安,项爱民,李辉.滇西和北京区域重力场演化及其与地震关系的探讨.地震,1999,19(1):97-106
[9]贾民育,项爱民,孙少安,等.滇西北地区水循环的重力效应.地震学报,1995,17(3):340-346
[10]薄万举.分频段排干扰方法的建立与应用.山西地震,1993(3)
[11]周硕愚,帅平,郭逢英,等.中国福建及其边缘海域现时地壳运动定量研究.地震学报,2000,22(1):66-72
[14]熊熊,许厚泽,傅容珊.大陆岩石圈的增厚及对流剥离对青藏高原隆升的影响.地壳形变与地震,1998,18(3):1-7
[15]王琪,游新兆,王文颖,等.跨喜马拉雅的GPS观测与地壳形变.地壳形变与地震,1998,18(3):43-50
[16]梅世蓉.地震前兆场物理模式及前兆分布特征与机制研究进展.地震,1995,增刊:2-22
[17]牛志人,范增节.硬包体对唐山大地震孕育过程及前兆变化的影响.地震,1995,增刊:23-30
[18]张桥梁.扩容地形变的基本特征.地壳形变与地震,1988,8(4):349-353
[19]张国民,耿鲁明,张永仙.构造块体的成组孕震模型和前兆场某些特征的分析.地震学报,1995,17(1):1-10
[2]马杏垣主编.中国岩石圈动力学纲要.北京:地震出版社,1987
[3]丁国瑜主编.中国岩石圈动力学概论.北京:地震出版社,1991
[4]傅容珊,黄建华,徐耀民,等.印度与欧亚板块碰撞的数值模拟和现代中国大陆形变.地震学报,2000,22(1):1-7
[5]张祖胜.利用大地形变测量资料估计我国大陆地区近几十年的地震趋势.中国地震大形势研究.北京:地震出版社,1990
[6]应绍奋,沈永坚,黄立人,等.中国大陆形变场特征及中长期地震危险性划分//国家地震局科技发展司编.中国大陆2005年前强震危险性预测研究.北京:地震出版社,1997
[7]马宗晋,汪良谋,李存悌,等.中国及邻区特大地震地质与地球物理环境和危险区划分//国家地震局科技发展司编.中国大陆2005年前强震危险性预测研究.北京:地震出版社,1997
[8]孙少安,项爱民,李辉.滇西和北京区域重力场演化及其与地震关系的探讨.地震,1999,19(1):97-106
[9]贾民育,项爱民,孙少安,等.滇西北地区水循环的重力效应.地震学报,1995,17(3):340-346
[10]薄万举.分频段排干扰方法的建立与应用.山西地震,1993(3)
[11]周硕愚,帅平,郭逢英,等.中国福建及其边缘海域现时地壳运动定量研究.地震学报,2000,22(1):66-72
[14]熊熊,许厚泽,傅容珊.大陆岩石圈的增厚及对流剥离对青藏高原隆升的影响.地壳形变与地震,1998,18(3):1-7
[15]王琪,游新兆,王文颖,等.跨喜马拉雅的GPS观测与地壳形变.地壳形变与地震,1998,18(3):43-50
[16]梅世蓉.地震前兆场物理模式及前兆分布特征与机制研究进展.地震,1995,增刊:2-22
[17]牛志人,范增节.硬包体对唐山大地震孕育过程及前兆变化的影响.地震,1995,增刊:23-30
[18]张桥梁.扩容地形变的基本特征.地壳形变与地震,1988,8(4):349-353
[19]张国民,耿鲁明,张永仙.构造块体的成组孕震模型和前兆场某些特征的分析.地震学报,1995,17(1):1-10
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心