昆仑山地震前后基线变化特征研究
|
摘要
应用中国地壳观测网络GPS基准站连续观测资料,研究了昆仑山地震前后基线长度及方向的变化特征;根据昆仑山地震破裂方向,讨论了不同方位基线变化特征的差异性,并从理论上探讨了基线长度与基线方向变化的灵敏性问题。研究结果表明:1)当基线方向与地震破裂方向近于一致时,基线长度的灵敏性要高于基线方向的灵敏性;2)当基线方向与地震破裂方向近于垂直时,基线方向的灵敏性要高于基线长度的灵敏性;3)当基线方向与地震破裂方向成45°时,基线长度和基线方向在震前有可能发生显著的变化。
On the basis of the data of Crustal Movement Observation Network of China(CMONOC),the characteristics of baseline length and direction changes before and after Kunlun Mountain earthquake are studied.According to the rupture direction of Kunlun Mountains earthquake and the characteristic difference in the different bearing of baseline change,the sensibility problem that related change of baseline length and direction to the earthquake are discussed theoretically.The study shows that: 1) If the baseline direction is consistent with the earthquake's fracture direction then the sensibility of baseline length will be higher than baseline direction;2)If the baseline direction is vertical to the earthquake's fracture direction then the sensibility of baseline direction is higher than baseline length;3)If the baseline direction makes angle 45° to the earthquake's fracture direction then both the baseline length and baseline direction may evidently change before the earthquake.
On the basis of the data of Crustal Movement Observation Network of China(CMONOC),the characteristics of baseline length and direction changes before and after Kunlun Mountain earthquake are studied.According to the rupture direction of Kunlun Mountains earthquake and the characteristic difference in the different bearing of baseline change,the sensibility problem that related change of baseline length and direction to the earthquake are discussed theoretically.The study shows that: 1) If the baseline direction is consistent with the earthquake's fracture direction then the sensibility of baseline length will be higher than baseline direction;2)If the baseline direction is vertical to the earthquake's fracture direction then the sensibility of baseline direction is higher than baseline length;3)If the baseline direction makes angle 45° to the earthquake's fracture direction then both the baseline length and baseline direction may evidently change before the earthquake.
引文
1牛安福,等.昆仑山口西8.1级地震前祁连山地震带附近形变异常的演化特征[J].地震,2003,23(4):21~26.
2顾国华,等.关于2001年昆仑山8.1级大地震前后中国大陆地壳水平运动的讨论[J].地震学报,2003,25(6):653~660
3万永革,等.利用GPS和水准测量资料反演2001年昆仑山口西8.1级地震的同震滑动分布[J].地震地质,2004,26(3):393~404.
4江在森,等.GPS初步结果揭示的中国大陆水平应变场与构造变形[J].地球物理学报,2003,46(3):352~358.
5王琪,等.中国大陆现今构造变形GPS观测数据与速度场[J].地学前缘,2002,9(2):415~429.
6尹祥础.固体力学[M].北京.地震出版社,1985.
2顾国华,等.关于2001年昆仑山8.1级大地震前后中国大陆地壳水平运动的讨论[J].地震学报,2003,25(6):653~660
3万永革,等.利用GPS和水准测量资料反演2001年昆仑山口西8.1级地震的同震滑动分布[J].地震地质,2004,26(3):393~404.
4江在森,等.GPS初步结果揭示的中国大陆水平应变场与构造变形[J].地球物理学报,2003,46(3):352~358.
5王琪,等.中国大陆现今构造变形GPS观测数据与速度场[J].地学前缘,2002,9(2):415~429.
6尹祥础.固体力学[M].北京.地震出版社,1985.
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