Present-Day Crustal Vertical Motion Around the Ordos Block Constrained by Precise Leveling and GPS Data

详细信息    查看全文

• 作者：Ming Hao ; Qingliang Wang ; Duxin Cui ; Liwei Liu ; Lin Zhou
• 刊名：Surveys in Geophysics
• 出版年：2016
• 出版时间：September 2016
• 年：2016
• 卷：37
• 期：5
• 页码：923-936
• 全文大小：1,937 KB
• 刊物类别：Earth and Environmental Science
• 刊物主题：Earth sciences
  Geophysics and Geodesy
  Geosciences
  Astronomy
  
• 出版者：Springer Netherlands
• ISSN：1573-0956
• 卷排序：37

文摘

Precise leveling data observed in the period of 1970–2014 around the Ordos block were collected and processed to estimate present-day crustal vertical movement. Vertical rates of 6 GPS sites were employed as a priori constraints to define the reference frame. The velocity field shows that the interior of the Ordos block moves upward at a rate of 3 mm/a as a stable block. With respect to the central Ordos, the grabens and rifts around the Ordos block are undergoing subsidence, while the northeastern and southwestern Ordos uplift at the average rates of 2 and 1 mm/a, respectively. To the southeastern margin of the Ordos block, the Weihe and southern Shanxi grabens are subsiding at the rates of 4–6 mm/a. The subsidence of the Shanxi graben indicates that the graben is experiencing extensional movement on a long timescale. To the northwestern margin of the Ordos block, the Hetao and Yinchuan rifts are subsiding at the rates of 2–3 mm/a. A 2-D buried faulting model is used to infer the normal or reverse dip-slip rates. Our solution shows that most of the normal slip rates along the faults in the grabens and rifts are ~2 mm/a.KeywordsVertical movementOrdos blockLevelingGPSShanxi graben