| 均衡异常与喜马拉雅隆起 |
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| 引用本文： | 张赤军.均衡异常与喜马拉雅隆起[J].大地测量与地球动力学,1997(3). |
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| 作者姓名： | 张赤军 |
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| 作者单位： | 中国科学院测量与地球物理研究所 |
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| 摘 要： | 利用重力测量资料，分析了喜马拉雅地区的均衡异常和板块水平挤压的重力效应，结果表明：沿喜马拉雅山脊存在一条正的均衡异常带；板块水平挤压的均衡效应不明显。基于热异常地幔的观点，讨论了异常的场源，并估算了喜马拉雅的相对上升高度和速率，指出：场源深度在莫氏面以下；推测该场源为一高温异常地幔体，其形状似一水平圆柱；相对上升高度为２．５ｋｍ，上升速率为５．２ｍｍ／ａ。
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| 关 键 词： | 喜马拉雅地块 均衡异常 隆起运动 |
ACCURATE CALCULATION OF SURFACE DISPLACEMENT INDUCED BY SINGLE WELL WITHDRAWAL OF NONSTEADY PERMEABLE FLOW OF GROUNDWATER IN RADIAL DIRECTION |
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| Liu Dingwen and Lu Jiazhen.ACCURATE CALCULATION OF SURFACE DISPLACEMENT INDUCED BY SINGLE WELL WITHDRAWAL OF NONSTEADY PERMEABLE FLOW OF GROUNDWATER IN RADIAL DIRECTION[J].Journal of Geodesy and Geodynamics,1997(3). |
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| Authors: | Liu Dingwen and Lu Jiazhen |
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| Abstract: | With the help of Theis's theory on nonsteady flow of underground water, the analytic expressions of surface displacement induced by single well withdrawal of nonsteady radial radiant permeable flow on groundwater are derived, and the calculational scheme corresponding to these expressions is discussed. Then the calculation programmes of numerical integration using Hermite's integral formula with 20 nodal points are carried out. And some simulated calculation examples are given too. So the methods in this paper can be used in considering quantitatively the changes of crustal deformation induced by groundwater drainage while the high precise dynamic geodetic measurement is done in the area of underground nonsteady flow field. |
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| Keywords: | ground water crustal deformation nonsteady permeable flow surface displacement |
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