| 特征地震强地面运动参数衰减公式拟合 |
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| 引用本文： | 史保平,刘博研,张健.特征地震强地面运动参数衰减公式拟合[J].地震学报,2007,29(4):391-399. |
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| 作者姓名： | 史保平 刘博研 张健 |
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| 作者单位： | （中国北京100049中国科学院研究生院地球科学学院) |
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| 基金项目： | 中国科学院百人计划和国家基金委项目 |
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| 摘 要： | 计算机仿真模拟设定地震断层动态破裂传播和近断层强地表运动响应的结果表明， 对于特征地震而言，近断层附近的地表运动特征与断层破裂传播的方向性有着强烈的依赖关系. 当场地（观测点）至断层的距离给定时，正向于破裂传播方向的场地（场地A）的地表质点运动（位移、速度、加速度），远远大于震中附近（场地B）和反向于破裂传播方向的场地（场地C）的地表质点运动，而且沿断层垂直分量所辐射的SH波的传播起到了主导作用. 对应于场地A，B和C，统计分析结果表明，峰值加速度的几何平均值之比为2.15:1.5:1， 而且各自的均方差分别为0.12, 0.11和0.13. 如果将所得的研究结果应用于概率地震危险性分析中，对于较低的年超越频度，近断层附近的地表峰值加速度的估算值可下降15%~30%. 因此，考虑到断层破裂传播方向性对地表运动的影响，区域衰减曲线的回归分析模型应该给予恰当的修正.
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| 关 键 词： | 破裂传播方向性 地表运动 峰值加速度 |
| 文章编号： | 0253-3782(2007)04-0391-09 |
| 修稿时间： | 2006年10月27 |
DEVELOPMENT OF ATTENUATION RELATION FOR THE NEAR FAULT GROUND MOTION FROM THE CHARACTERISTIC EARTHQUAKE |
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| Shi Baoping,Liu Boyan,Zhang Jian.DEVELOPMENT OF ATTENUATION RELATION FOR THE NEAR FAULT GROUND MOTION FROM THE CHARACTERISTIC EARTHQUAKE[J].Acta Seismologica Sinica,2007,29(4):391-399. |
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| Authors: | Shi Baoping Liu Boyan Zhang Jian |
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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 1000 earthquake events with a magnitude of MW8.0. The simulated results show that, for the characteristic event with a strike-slip faulting, the characteristics 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 B) and remained places close to the fault (site C). 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 deviation is 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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