| Gravity change and its mechanism after the first water impoundment in Three Gorges Project |
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| 作者姓名： | 孙少安 项爱民 朱平 申重阳 |
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| 作者单位： | Institute of Seismology China Earthquake Administration，Crustal Movement Laboratory，Wuhan 430071，China，Wuhan Base of the Institute of Crustal Dynamics，China Earthquake Administration，Wuhan 430071，China，Institute of Seismology，China Earthquake Administration，Crustal Movement Laboratory，Wuhan 430071，China，Wuhan Base of the Institute of Crustal Dynamics，China Earthquake Administration，Wuhan 430071，China，Institute of Geophysics，China Earthquake Administration，Institute of Seismology，China Earthquake Administration，Crustal Movement Laboratory，Wuhan 430071，China，Wuhan Base of the Institute of Crustal Dynamics，China Earthquake Administration，Wuhan 430071，China，Wuhan 430071，China，Wuhan 430071，China，Beijing 100081，China，Wuhan 430071，China |
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| 基金项目： | Foundation item： Social Welfare Research Special Project of Ministry of Science and Technology （2004DIB3J131）. |
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| 摘 要： | Introduction During and before the construction of the Three Gorges Project, the annual observation was continuously undertaken by the Three Gorges gravity observation network established around the head area of the reservoir (the section between Sandouping and Badong). This network has pro-vided substantial high precise data related to seismic activity. However, the annual gravity survey together monitoring of the existed observation stations can hardly effective monitor some potential sei…
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| 关 键 词： | 三峡工程 重力变化 地震 地球构造 |
| 文章编号： | 1000-9116（2006）05-0522-08 |
| 收稿时间： | 2006-02-13 |
| 修稿时间： | 2006-08-03 |
Gravity change and its mechanism after the first water impoundment in Three Gorges Project |
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| SUN Shao-an,XIANG Ai-min,ZHU Ping,SHEN Chong-yang.Gravity change and its mechanism after the first water impoundment in Three Gorges Project[J].Acta Seismologica Sinica(English Edition),2006,19(5):522-529. |
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| Authors: | SUN Shao-an XIANG Ai-min ZHU Ping SHEN Chong-yang |
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| Institution: | 1. Institute of Seismology,China Earthquake Administration,Wuhan,430071,China;Crustal Movement Laboratory,Wuhan,430071,China;Wuhan Base of the Institute of Crustal Dynamics,China Earthquake Administration,Wuhan 430071,China
2. Institute of Geophysics,China Earthquake Administration,Beijing,100081,China |
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| Abstract: | In this paper we have analyzed precise gravity survey and gravity effects resulted from water loading, crustal deformation,
ground water level change and precipitation before and after the water impoundment in the Three Gorges Reservoir. We found
that: ① In dam area of the reservoir, gravity effect resulted from water load increase is the most significant, maximum gravity
change is 200×10−3 m/s2, but this effect is limited in amplitude and range. Gravity change can be observed about 5 km offshore. The gravity change
caused by ground water level change is regional; and the impact of precipitation on it should not be neglected. ② At head
area of the reservoir, the maximum gravity change is near Xiangxi. Monitoring the variation of gravity field and further study
should continue in the future.
Foundation item: Social Welfare Research Special Project of Ministry of Science and Technology (2004D1B3J131). |
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| Keywords: | the Three Gorges Project the first water impoundment gravity change |
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