| Three-dimensional viscoelastic LDDA method and its application in geoscience |
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| 作者姓名： | 刘金朝 陆诗阔 许鹤华 王石 蔡永恩 |
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| 作者单位： | LIU Jin-zhao1) LU Shi-kuo1) XU He-hua1) WANG Shi2) CAI Yong-en1)1) Department of Geophysics & Geodynamic Research Center，Peking University，Beijing 100871，China 2) Beijing Hua-Ke-Ruan Hydroelectric Technique Company，Beijing 120761，China |
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| 基金项目： | SSTCC Climb Program (95-S-05). |
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| 摘 要： | Introduction A lot of work has been done in studying geological problems in terms of finite-element method (FEM). Assuming the material of fault as a perfect plastic one, WANG, et al (1980, 1982) simulated the transference of the larger earthquakes in North China by elasto-plastic FEM, the earthquakes are simulated by reducing frictional coefficients of the fault. YIN and ZHANG (1982) investigated the instability of earthquakes by FEM with strain-softening material model. WANG and C…
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| 收稿时间： | 15 April 2002 |
| 修稿时间： | 5 June 2002 |
Three-dimensional viscoelastic LDDA method and its application in geoscience |
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| Liu Jin-zhao, Lu Shi-kuo, Xu He-hua, Wang Shi and Cai Yong-en.Three-dimensional viscoelastic LDDA method and its application in geoscience[J].Acta Seismologica Sinica(English Edition),2002,15(3):341-348. |
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| Authors: | Liu Jin-zhao Lu Shi-kuo Xu He-hua Wang Shi and Cai Yong-en |
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| Institution: | 1. Department of Geophysics & Geodynamic Research Center, Peking University, Beijing 100871, China
2. Beijing Hua-Ke-Ruan Hydroelectric Technique Company, Beijing 120761, China |
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| Abstract: | A three-dimensional viscoelastic LDDA method is put forward on the basis of the two-dimensional elastic LDDA method and a corresponding computer program is developed. Both the method and the program, verified by a numerical frictional experiment composed of two blocks, are correct and reliable. Simultaneously, using this program, the present velocity field of the eastern Asia area, which is induced by the collision of the Indian shield against the Asian plate, is investigated. The primary result shows that the velocity field in magnitude is largest near the colliding boundary and attenuates fast away from it. The Tibet plateau moves northeast, the North China plain and the southeastern Asia moves eastward and southeastward, respectively. The attenuation of the velocity field across Qilianshan is nonlinear, its direction changes from the northeast nearly to the east, its gradient is 0.05 mma-1km-1 and 0.007 mma-1km-1 to the southwest and the northeast of Qilianshan, respectively. The attenuation of the velocity field is almost linear across the Longmenshan fault, its gradient is 0.01 mma-1km-1 and its direction is toward the southeast. The remarkable deformation caused by collision extends to the east longitude 115 and to the north latitude 45. The velocity field obtained by the method is basically consistent with the data from the Global Positioning System. The relative slip rate along the Bangong-Nujiang-Lancangjiang fault is 0.5 mm/a, the Jinshajiang fault, 0.8 mm/a, while the Tanlu fault hardly moves. It is shown that the method proposed in this paper could be employed to study the geodynamic problems with faults. |
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| Keywords: | D LDDA method collision of the Indian shield against the Asian plate eastern Asia velocity field |
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