| 长江三峡库首区近期重力场动态变化 |
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| 引用本文： | 申重阳,孙少安,刘少明,项爱民,李辉,杨光亮. 长江三峡库首区近期重力场动态变化[J]. 大地测量与地球动力学, 2004, 24(2): 6-13 |
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| 作者姓名： | 申重阳 孙少安 刘少明 项爱民 李辉 杨光亮 |
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| 作者单位： | 中国地震局地震研究所,武汉,430071;中国地震局地壳应力研究所创新基地,武汉,430071 |
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| 基金项目： | 科技部 2 0 0 2年公益研究专项(国科发财字 [2 0 0 2 ] 484号 )，长江三峡工程开发总公司 2 0 0 3年专项资助项目 (CT -0 3 -0 7-0 2 )“长江三峡水库诱发地震监测研究” |
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| 摘 要： | 利用向上解析延拓方法分析了1988～2003年底(首次蓄水后)长江三峡库首区重力场的动态变化，并分析了首次蓄水过程中重力变化的基本特征。主要结论有：库区存在一定的重力变化背景和地壳密度变异条件；向上解析延拓方法能较好地分离不同波数域重力变化特征，其中长波数信息反映较深处或较大尺度异常密度体效应；首次蓄水过程中的重力变化显示强烈的库水荷载效应和明显滞后的库水渗透效应，其中江北地区水的渗透明显强于江南地区。
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| 关 键 词： | 重力变化 蓄水 三峡水库 荷载 水渗透 重力场 |
| 文章编号： | 1671-5942(2004)02-0006-08 |
| 修稿时间： | 2004-01-05 |
DYNAMIC VARIATIONS OF GRAVITY FIELD IN HEAD AREA OF THREE GORGES RESERVOIR IN RECENT YEARS |
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| Shen Chongyang,),Sun Shaoan,),Liu shaoming,)Xiang Aiming,),Li Hui,) and Yang Guangliang,) ) Institute of Seismology,CEA,Wuhan )Wuhan Base of Institute of Crustal Dynamics,CEA,Wuhan. DYNAMIC VARIATIONS OF GRAVITY FIELD IN HEAD AREA OF THREE GORGES RESERVOIR IN RECENT YEARS[J]. Journal of Geodesy and Geodynamics, 2004, 24(2): 6-13 |
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| Authors: | Shen Chongyang ) Sun Shaoan ) Liu shaoming )Xiang Aiming ) Li Hui ) Yang Guangliang ) ) Institute of Seismology CEA Wuhan )Wuhan Base of Institute of Crustal Dynamics CEA Wuhan |
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| Affiliation: | Shen Chongyang1,2),Sun Shaoan1,2),Liu shaoming1,2)Xiang Aiming1,2),Li Hui1,2) and Yang Guangliang1,2) 1) Institute of Seismology,CEA,Wuhan 430071 2)Wuhan Base of Institute of Crustal Dynamics,CEA,Wuhan 430071 |
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| Abstract: | In this paper, we analyzed dynamic variations of gravity field in the reservoir head area of the Three Gorges by the upward analytical continuation from 1998 to the end of 2003 (after the first water impoundment), and analyzed the essential characteristic of the variations of gravity field during the first impoundment. The following main conclusions are drawn: There are some background variations of gravity field and conditions of density anomaly in the reservoir; The method of the upward analytical continuation is good to keep the each characteristic of the gravity variations with a certain wave number domain distinct from the other one with different wave number among them the information with larger wave number indicates the effect of anomalous mass in depth or of large scale; The gravity changes during the first impoundment indicated that the effect of the water load is very strong, and the effect of infiltration is evident and lag, where the infiltration in the north region to the Yangtz River is stronger than that in the south region. |
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| Keywords: | gravity changes water impoundment the Three Gorges reservoir load water infiltration |
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