新丰江水库5.3级(1964)地震区三角网平差和震源参数反演>.
TRIANGULATION NET ADJUSTMENT AND THE FOCAL PARAMETERS OF THE 1964 MAGNITUDE 5.3 EARTHQUAKE OF THE XINFENGJIANG RESERVOIR AREA BY INVERSION
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摘要: 本文系统地介绍了地震区三角网平差和利用平差结果反演断层参数的随机尝试————动态平差方法.通过新丰江水库5.3级地震区三角测量资料的处理, 进一步阐述如何应用这种方法, 并给出反演5.3级地震断层参数结果:断层走向北东62, 倾向南东, 倾角59, 断层长4.7公里, 上界面深0.45公里, 下界面深4.5公里, 倾向滑距73.4毫米, 走向滑距25.5毫米, 为正断右旋走滑断层, 地震矩 m0=2.01024达因厘米, 应力降=12巴, 释放的应变能下限 E=1.21019尔格.文中依据所得结果, 结合地震机制和构造资料讨论了新丰江水库地震的力源问题, 指出区域应力场是主要力源, 水压应力场是主要的诱发力源。Abstract: In this paper, the triangulation net adjustment in the Xinfengjiang reservoir area and the method of random try-motion adjustment used to get the fault parameters by inversion of the results of adjustment are systematically described. In treating the triangulation data before and after the magnitude 5.3 earthquake of the Xinfengjiang reservoir area it has been further made clear the applicability of the method.Through inversion, the parameters of the earthquake fault are: strike N62E, dipping to the southeast at an angle of 59, the length of the fault, 4.7 km, depth of its upper boundary, 0.45 km, lower boundary, 4.5 km, dip slip dislocation, 73.4 mm, strike slip dislocation, 25.5 mm. It is a normal right-lateral fault, seismic moment m0=2.01024 dyne-cm, stress drop =12 bars, strain energy release E=1.21019 ergs.It is also discussed the force system causing the earthquakes of the Xinfengjiang reservoir area based on the results thus obtained and the data of focal mechanisms and of tectonic structures. The conclusion is that the regional stress field constitutes the main cause, while the water pressure provides the triggering effect of the earthquakes.
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[10] 中国科学院数学研究所统计组编, 常用数理统计方法, 科学出版社, 262, 1974.[1] 陈运泰等, 用大地测量资料反演的1976年唐山地震的位错模式, 地球物理学报, 22, 3, 1979.
[2] 王椿铺等, 用地形变资料确定通海地震的断层参数, 地球物理学报, 21, 3, 1978.
[3] L. Mansinha and D. E. Smylie, 1'he displacement fields of inclined faults, Bull. Seirm. Soc. Amen, 61, 5, 1911.
[4] 陈运泰等, 根据地面形变的观侧研究1966年邢台地震的震源过程, 地球物理学报, 18, 3, 1975.
[5] T. Maruyama, Statical elastic dislocations in an infinite and Semi——infinite medium, Bull. Earthq. Res, lnrt., 'Tokyo Univ., 42, 2, 1964.
[6] F. Press, Displacaments, strains and tilts at teleseismic distances, J. G. R., 70, 10, 1965.
[7] 王妙月等, 新丰江水库地震的震源机制及其成因的初步探讨, 地球物理学报, 19, 1, 1976.
[8] 中国科学院地质研究所破裂与震源力学组、广东省科技局新丰江地震总结组, 新丰江水库区微震震源力学的初步研究, 地质科学, 3, 1974.
[9] 冯锐, 新丰江6.1级水库地震前后的波速比变化, 地球物理学报, 20, 3, 1977.
[10] 中国科学院数学研究所统计组编, 常用数理统计方法, 科学出版社, 262, 1974.
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