断层活动的重力效应ht
CHANGE IN GRAVITY CAUSED BY FAULT MOVEMENTS
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摘要: 本文对介质变形造成的重力变化作了定量分析, 通过质点位移法(拉格朗日法)导出了介质位移场和由它产生的附加重力场之间的积分关系式.应用已有的弹性和粘弹性半空间任意倾角断层位错的位移表达式, 本文通过三维空间数值积分, 计算了弹性介质和广义开尔文介质中断层不同的运动方式所产生的地表附加重力场, 以及介质流变性导致的重力随时间的变化趋势.参考唐山地震前沧东断裂的活动和震时断层错动, 计算了震前震后相应的重力变化, 其结果与实测重力资料有一定程度的符合.Abstract: In this paper, the change in gravity caused by local deformation of the crustal medium is quantitatively investigated. By the method of point mass displacement (i.e. the Lagrange Method) the integral relation between the displacement field of crustal medium and the additional gravity field involved has been derived.By using known analytic expressions of the displacement due to a slip of a fault of any dipping angle in an elastic or visco-elastie half-space, we have calculated by three-dimensional numerical integration, the additional gravity field on the ground surface, resulting from various types of fault movements in an elastic or genera lized Kelvin medium, as well as the tendency of gravity change with time given rise by the rheological behavior of the medium.Referring to the movement of the Cang-Tong Fault before the Tangshan Earthquake of 1976 and the fault dislocation during that earthquake, the associate gravity change before and after the earthquake has been computed and the results agree to a certain extent with the observed.
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[1] 陈运泰等, 根据地面形变的观测研究lsss年邢台地震的震源过程, 地球物理学报, 18, 3, 1975.
[2] 赵国光, 张超, 伴随前兆蠕动和震后断层滑动的准静态形变, 地震学报, 3, 3, 1981.
[3] 赵国光, 黄佩玉, 唐山地震前的断层运动与应力积累, 参加26届国际地质大会论文集, 构造地质和地质力学, 地质出版社, 1980.
[4] Chen Yen——tai, Gu Hau——ding and Lu Zao——xun, Variation of gravity before and after Haicheng eartliquake, 1975 and Tangshan earthquake, 1976, Phys. Earth. Plane. Interiors, 18, 330——338. 1979.
[5] W. I. Reilly, and T. M. Hunt, Comment on‘An analysis of local changes in gravity due to deformation', Pure Appl. Geophys, 114, 6, 1976.
[6] J. B. Walsh, An analysis of local changes in gravity due to deformation, Pure Appl. geophys, 113, 1, 1975.
[7] J. B. Walsh, Reply, Pure. Appl. Geophys., 114, 6, 1976.
[8] J. B. Walsh and J. R. Rice, Local changes in gravity resulting from deformation. J. Geophys. Res., 84, B1, 1979.
[9] J. H. Whitcamb, New vertical geodesy. J. Geophys. Res., 81, 26, 1976.[1] 陈运泰等, 根据地面形变的观测研究lsss年邢台地震的震源过程, 地球物理学报, 18, 3, 1975.
[2] 赵国光, 张超, 伴随前兆蠕动和震后断层滑动的准静态形变, 地震学报, 3, 3, 1981.
[3] 赵国光, 黄佩玉, 唐山地震前的断层运动与应力积累, 参加26届国际地质大会论文集, 构造地质和地质力学, 地质出版社, 1980.
[4] Chen Yen——tai, Gu Hau——ding and Lu Zao——xun, Variation of gravity before and after Haicheng eartliquake, 1975 and Tangshan earthquake, 1976, Phys. Earth. Plane. Interiors, 18, 330——338. 1979.
[5] W. I. Reilly, and T. M. Hunt, Comment on‘An analysis of local changes in gravity due to deformation', Pure Appl. Geophys, 114, 6, 1976.
[6] J. B. Walsh, An analysis of local changes in gravity due to deformation, Pure Appl. geophys, 113, 1, 1975.
[7] J. B. Walsh, Reply, Pure. Appl. Geophys., 114, 6, 1976.
[8] J. B. Walsh and J. R. Rice, Local changes in gravity resulting from deformation. J. Geophys. Res., 84, B1, 1979.
[9] J. H. Whitcamb, New vertical geodesy. J. Geophys. Res., 81, 26, 1976.
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