| Spatial distribution of near-fault ground motion |
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| 作者姓名： | 刘启方 袁一凡 金星 |
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| 作者单位： | Institute of Engineering Mechanics，China Earthquake Administration，Harbin 150080，China，Institute of Engineering Mechanics，China Earthquake Administration，Harbin 150080，China，Institute of Engineering Mechanics，China Earthquake Administration，Harbin 150080，China |
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| 基金项目： | National Natural Science Foundation of China (59895410)，Commonweal Foundation of the Ministry of Science and Technology of China (2001DIB20098). |
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| 摘 要： | Introduction In order to explain severe damage of structures and ground surface near earthquake fault, many theoretical and numerical methods have been developed to study strong ground motion near the fault (Somerville, 1998) via the kinematic and dynamic source models. Moreover, a great number of valuable strong ground motion records, especially near the fault, have been acquired in recent years. These valuable records provide useful data for improving simulation approaches. Based on those r…
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| 收稿时间： | 6 November 2002 |
| 修稿时间： | 1 November 2003 |
Spatial distribution of near-fault ground motion |
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| Liu Qi-fang, Yuan Yi-fan and Jin Xing.Spatial distribution of near-fault ground motion[J].Acta Seismologica Sinica(English Edition),2004,17(2):200-210. |
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| Authors: | Liu Qi-fang Yuan Yi-fan and Jin Xing |
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| Institution: | Institute of Engineering Mechanics, China Earthquake Administration, Harbin 150080, China |
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| Abstract: | Near-fault strong ground motion of strike-slip and dip-slip of vertical and inclined rectangular fault in half-space and layered half-space is analyzed by dislocation source model. The Fourier spectra ratio of ground motion is adopted to study the characteristics of near-fault ground motion. For both slip models, near-fault strong ground motion with high amplitude is located in a narrow belt area along the projection of the fault on the ground and mainly controlled by the sub-faults nearby. Directivity of strike-slip fault is more dominant in long period for components perpendicular to the fault, and more dominant in long period for components parallel to the fault for dip-slip fault. The deeper the location of the source is, the more slowly the amplitude of ground motion attenuates. There is obvious hanging wall effect in ground motion of inclined fault, and the spatial distribution of ground motion is asymmetric which coincides with observational data. Finally, a fitting function of spatial distribution for near-fault ground motion is proposed and compared with near source factors of the 1997 Uniform Building Code of USA. |
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| Keywords: | near-fault strong ground motion dislocation model directivity near source factor |
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