地震研究

为在强地震动模拟计算中实现地震动的地形效应,采用地震动随机模拟中的有限断层法,依据山地中的局部场地条件和地形特征,提出在随机模型中构建局部场地放大项和高频衰减联合的场地效应项表征地形效应的方法,并以位处于张家口典型山地地形的崇礼冬奥会场址区为研究区,结合近场地震构造背景,完成场址区可能面临的强地震动场计算分析。结果表明:①计算得到崇礼场址区潜在最大地震动强度可能会达到210 cm/s²; ②山地模型与平层模型的对比研究得到不考虑地形效应的平层模型会低估地震动特性在山地地形的真实性; ③在随机有限断层法中采用相应的局部场地放大系数和高频衰减因子组成的场地联合效应实现地形效应的表达途径是可行的,并且本方法在山体地形效应强度估计的准确性和地震动场计算效率方面具有一定优势。

Based on the local site condition and topographical features of the mountain land,and according to the Stochastic Finite-fault method,we propose a method of illustrating the topographical effect with the site response effect including local site amplification and high frequency attenuation to estimate the topographical effect by simulating the strong ground motion.Taking Chongli,the Winter Olympic Games site in the typical mountainous topography in Zhangjiakou region as a study case,we calculate and analyze the strong ground motion field.The results show that:① The maximum value of PGA at Chongli site may reach 210 Gal.② The comparison of the mountain model with the flat-layer model shows that the flat-layer model ignoring the topographical effect will underestimate the validity of the strong ground motion in the mountain land.③ When using the Stochastic Finite-fault method,it is feasible to take into account the site combined effect consisting of the local site amplification factor and the high frequency attenuation factor to express the topographical effect.This method is superior in estimating the topographical effect intensity and computing the ground motion field.

引言
1 研究方法
2 近场强地面运动场计算
3 地形效应影响分析讨论
4 结论

图1 随机有限断层模型示意图<br/>Fig.1 Sketch of the stochastic finite-fault model

图1 随机有限断层模型示意图
Fig.1 Sketch of the stochastic finite-fault model

表1 张家口地区主要活动断裂特征<br/>Tab.1 Characteristics of the major active faults in Zhangjiakou region

表1 张家口地区主要活动断裂特征
Tab.1 Characteristics of the major active faults in Zhangjiakou region

图2 张家口地区主要活动断裂分布<br/>Fig.2 Major active faults in Zhangjiakou region

图2 张家口地区主要活动断裂分布
Fig.2 Major active faults in Zhangjiakou region

表2 尚义—赤城断裂地震动计算输入参数<br/>Tab.2 Input modeling parameters in the stochastic simulation of an earthquake on the Shangyi-Chicheng fault

表2 尚义—赤城断裂地震动计算输入参数
Tab.2 Input modeling parameters in the stochastic simulation of an earthquake on the Shangyi-Chicheng fault

表3 尚义—赤城断裂及张家口断裂对场址区重点观测点地震动强度估计<br/>Tab.3 PGA-values of a scenario earthquake at 6 sites in the Chongli Winter Olympic area on the Shangyi-Chicheng fault and the Zhangjiakou fault

表3 尚义—赤城断裂及张家口断裂对场址区重点观测点地震动强度估计
Tab.3 PGA-values of a scenario earthquake at 6 sites in the Chongli Winter Olympic area on the Shangyi-Chicheng fault and the Zhangjiakou fault

图3 尚义—赤城断裂(a)、张家口断裂(b)强地震动计算得出的峰值加速度地表分布<br/>Fig.3 PGA distribution of a scenario earthquake on the Shangyi-Chicheng fault(a)and the Zhangjiakou fault(b)

图3 尚义—赤城断裂(a)、张家口断裂(b)强地震动计算得出的峰值加速度地表分布
Fig.3 PGA distribution of a scenario earthquake on the Shangyi-Chicheng fault(a)and the Zhangjiakou fault(b)

表4 张家口断裂地震动计算输入基本参数<br/>Tab.4 Input modeling parameters in the stochastic simulation of a scenario earthquake on the Zhangjiakou fault

表4 张家口断裂地震动计算输入基本参数
Tab.4 Input modeling parameters in the stochastic simulation of a scenario earthquake on the Zhangjiakou fault

表5 北美基岩场地局部场地放大系数<br/>Tab.5 Node points of amplification for generic rock sites in North America

表5 北美基岩场地局部场地放大系数
Tab.5 Node points of amplification for generic rock sites in North America

图4 应用平层模型计算得出的尚义—赤城断裂(a)、张家口断裂(b)峰值加速度地表分布<br/>Fig.4 PGA distribution of a scenario earthquake on the Shangyi-Chicheng fault(a)and the Zhangjiakou fault(b)calculated by the plain model

图4 应用平层模型计算得出的尚义—赤城断裂(a)、张家口断裂(b)峰值加速度地表分布
Fig.4 PGA distribution of a scenario earthquake on the Shangyi-Chicheng fault(a)and the Zhangjiakou fault(b)calculated by the plain model

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备注

引言

1 研究方法

2 近场强地面运动场计算

3 地形效应影响分析讨论

4 结论

期刊信息