| 不同区域地震前重力变化与垂直形变关系的差异性及其可能机制 |
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| 引用本文： | 王勇,李孟銮,陈素改.不同区域地震前重力变化与垂直形变关系的差异性及其可能机制[J].大地测量与地球动力学,1994(1). |
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| 作者姓名： | 王勇 李孟銮 陈素改 |
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| 作者单位： | 宁夏地震局，河北地震局 |
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| 摘 要： | 为了探讨不同区域地震前重力变化及其与地壳垂直形变关系差异性的可能机制，本文首先研究了地震前膨胀体在不同应力状态下四种性质不同的徽裂隙所引起的重力变化及其与垂直位移的关系，给出了相应的一些数值结果。分析了震源体处在不同力学和构造环境下，重力变化可能存在的差异以及唐山地震前重力变化的可能机制。研究结果表明，不同区域地震前重力变化与垂直位移关系的差异的一种可能机制是由于震源体所处的力学和构造环境不同，造成膨胀体内微裂隙破裂方式不同所引起；唐山地震前重力变化则可能是震前在震源区内丛集了大量垂直向张性微裂隙以及深部物质迁移至微裂隙中。
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| 关 键 词： | 重力，地形变，微裂隙，膨胀 |
A POSSIBLE MECHANISM OF THE DIFFERENCE OF THE RELATIONSHIP BETWEEN GRAVITY CHANGES AND CRUSTAL UPHEAVAL IN DIFFERENT AREAS |
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| Wang Yong,Li Mengluan and Chen Sugai.A POSSIBLE MECHANISM OF THE DIFFERENCE OF THE RELATIONSHIP BETWEEN GRAVITY CHANGES AND CRUSTAL UPHEAVAL IN DIFFERENT AREAS[J].Journal of Geodesy and Geodynamics,1994(1). |
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| Authors: | Wang Yong Li Mengluan and Chen Sugai |
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| Institution: | Wang Yong;Li Mengluan and Chen Sugai(Seismological Bureau of Ningxia)(Seismological Bureau of Hebei) |
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| Abstract: | In order to study the mechanism of the difference of gravity changes in different areas,gravity changes as well as the relationship between gravity and crustal upheaval produced by small cracks of four-types in dilatancy under different stress before earthquake are investigated in this paper.Some numerical result are given.The difference of gravity changes due to earthquake origin in different stress and tectonic circumstance and a possible mechanism of gravity changes before Tangshan earthquake(M=7. 8) is emphatically discussed. |
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| Keywords: | gravity curstal deformation crack dilatant |
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