| Development of attenuation relation for the near fault ground motion from the characteristic earthquake |
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| 作者姓名： | 史保平 刘博研 张健 |
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| 作者单位： | Graduate University of Chinese Academy of Sciences，Graduate University of Chinese Academy of Sciences，Graduate University of Chinese Academy of Sciences Beijing 100049，China，Beijing 100049，China，Beijing 100049，China |
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| 基金项目： | 0ne Hundred Individual Program of Chinese Academy of Sciences and National Natural Science Foundation of China （40574022）. Acknowlwdgements Special thanks for the help and suggestion given by editors and anonymous reviewers. |
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| 摘 要： | A composite source model has been used to simulate a broadband strong ground motion with an associated fault rupture process. A scenario earthquake fault model has been used to generate 1 000 earthquake events with a magni-tude of Mw8.0. The simulated results show that, for the characteristic event with a strike-slip faulting, the character istics of near fault ground motion is strongly dependent on the rupture directivity. If the distance between the sites and fault was given, the ground motion in the forward direction (Site A) is much larger than that in the backward direction (Site C) and that close to the fault (Site B). The SH waves radiated from the fault, which corresponds to the fault-normal component plays a key role in the ground motion amplification. Corresponding to the sites A, B, and C, the statistical analysis shows that the ratio of their aPG is 2.15:1.5:1 and their standard deviations are about 0.12, 0.11, and 0.13, respectively. If these results are applied in the current probabilistic seismic hazard analysis (PSHA), then, for the lower annual frequency of exceedance of peak ground acceleration, the predicted aPG from the hazard curve could reduce by 30% or more compared with the current PSHA model used in the developing of seismic hazard map in the USA. Therefore, with a consideration of near fault ground motion caused by the rupture directivity, the regression model used in the development of the regional attenuation relation should be modified accordingly.
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| 关 键 词： | 地震 断裂方向 地面运动 地面加速度 |
| 文章编号： | 1000-9116（2007）04-0416-09 |
| 收稿时间： | 27 October 2006 |
| 修稿时间： | 2006-10-27 |
Development of attenuation relation for the near fault ground motion from the characteristic earthquake |
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| Shi Bao-ping , Liu Bo-yan and Zhang Jian.Development of attenuation relation for the near fault ground motion from the characteristic earthquake[J].Acta Seismologica Sinica(English Edition),2007,20(4):416-424. |
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| Authors: | Shi Bao-ping Liu Bo-yan and Zhang Jian |
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| Institution: | Graduate University of Chinese Academy of Sciences, Beijing 100049, China |
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| Abstract: | A composite source model has been used to simulate a broadband strong ground motion with an associated fault rupture process. A scenario earthquake fault model has been used to generate 1 000 earthquake events with a magni-tude of Mw8.0. The simulated results show that, for the characteristic event with a strike-slip faulting, the character istics of near fault ground motion is strongly dependent on the rupture directivity. If the distance between the sites and fault was given, the ground motion in the forward direction (Site A) is much larger than that in the backward direction (Site C) and that close to the fault (Site B). The SH waves radiated from the fault, which corresponds to the fault-normal component plays a key role in the ground motion amplification. Corresponding to the sites A, B, and C, the statistical analysis shows that the ratio of their aPG is 2.15:1.5:1 and their standard deviations are about 0.12, 0.11, and 0.13, respectively. If these results are applied in the current probabilistic seismic hazard analysis (PSHA), then, for the lower annual frequency of exceedance of peak ground acceleration, the predicted aPG from the hazard curve could reduce by 30% or more compared with the current PSHA model used in the developing of seismic hazard map in the USA. Therefore, with a consideration of near fault ground motion caused by the rupture directivity, the regression model used in the development of the regional attenuation relation should be modified accordingly. |
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| Keywords: | rupture directivity ground motion peak ground acceleration |
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