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Current Vertical Motion Analysis of Northwestern Margin of Ordos Based on Precise Leveling
Guo Baozhen,Ta La,Zhou Haitao,Su Guangli
作者单位
Guo Baozhen The First Monitoring and Application Center, CEA, Tianjin 300180, China 
Ta La The First Monitoring and Application Center, CEA, Tianjin 300180, China 
Zhou Haitao The First Monitoring and Application Center, CEA, Tianjin 300180, China 
Su Guangli The First Monitoring and Application Center, CEA, Tianjin 300180, China 
摘要:
Ordos block was squeezed by the Qinghai-Tibetan block and North China block, and the tectonic activity was intense. In the periphery of Ordos block, there was a series of folds zones and compressed faults with complicate structures. This paper used three-phase data of 1980,1990 and 2014 to calculate vertical velocity of Northwestern margin of Ordos and the analytical results indicated that ① the Hetao basin between the rise of Yinshan fault block and Ordos fault block showed relatively subsidence, in which Linhe basin was the most evident and the subsidence rate was about 2-4mm/a. The subsidence rate of Jartai -Yinchuan rift zone on the western margin of Ordos block was about 2mm/a; ② the whole testing zone exhibited the evident inherited movement characterized by mountain rise and basin subsidence; ③the two leveling section through the northern margin fault and Dengkou-Benjing fault showed that the difference between vertical velocities on two sides of the fault was less than 0.5mm/a.
关键词:  Precise leveling  Ordos  Fault  Vertical velocity
DOI:
分类号:
基金项目:This project is funded by the Director Fund of the First Monitoring and Application Center, China Earthquake Administration (FMC2014001) and the North China Project of Integrated Geophysical Field Observations of China (201508009).
Current Vertical Motion Analysis of Northwestern Margin of Ordos Based on Precise Leveling
Guo Baozhen,Ta La,Zhou Haitao,Su Guangli
Abstract:
Ordos block was squeezed by the Qinghai-Tibetan block and North China block, and the tectonic activity was intense. In the periphery of Ordos block, there was a series of folds zones and compressed faults with complicate structures. This paper used three-phase data of 1980,1990 and 2014 to calculate vertical velocity of Northwestern margin of Ordos and the analytical results indicated that ① the Hetao basin between the rise of Yinshan fault block and Ordos fault block showed relatively subsidence, in which Linhe basin was the most evident and the subsidence rate was about 2-4mm/a. The subsidence rate of Jartai -Yinchuan rift zone on the western margin of Ordos block was about 2mm/a; ② the whole testing zone exhibited the evident inherited movement characterized by mountain rise and basin subsidence; ③the two leveling section through the northern margin fault and Dengkou-Benjing fault showed that the difference between vertical velocities on two sides of the fault was less than 0.5mm/a.
Key words:  Precise leveling  Ordos  Fault  Vertical velocity