地震研究

通过构建横向均匀成层的地震断层模型,利用随机有限断层法,计算了海河断裂发生6.5级地震的地震动分布。计算结果克服了现行综合概率法计算结果不能体现近场效应的缺陷,并反映出断层上盘效应等特点,该结果可作为最大可信地震动应用于抗震设防变形验算,同时还可以作为评价综合概率法结果不确定性的一个参考,对海河断裂影响带的防灾减灾具有一定的借鉴价值。

The Haihe Fault is a major active fault in Tianjin.It is an important basis for the seismologists to determine the potential earthquake sources,and it plays a decisive role for people to select the aseismic design parameters.In this paper,we make a homogeneous layer of horizontal fault model to compute the effect of ground motion of a hypothetic M6.5 earthquake generated by the Haihe Fault using stochastic finite-fault method.The new method overcomes the shortcomings of the integrated probability method that can not reflect the near filed effect.And it reflects the upfault feature.The result from the new method can serve as the maximum credible ground motion to check seismic fortification deformation.The result which is useful for disaster reduction in this zone can also serve as a reference for integrated probability calculations.

引言
1 随机有限断层法
2 海河断裂计算模型
3 计算结果及其分析
4 结论与讨论

表1 震源参数<br/>Tab.1 Seismic source parameters

表1 震源参数
Tab.1 Seismic source parameters

表2 地层参数
Tab.2 Formation parameters

图1 断层附近天津中医学院场点的加速度时程<br/>Fig.1 Acceleration time history of the site in Tianjin University of Traditional Chinese Medicine

图1 断层附近天津中医学院场点的加速度时程
Fig.1 Acceleration time history of the site in Tianjin University of Traditional Chinese Medicine

图2 断层附近天津市文化中心场点的加速度时程<br/>Fig.2 Acceleration time history of the site in Tianjin Cultural Centre

图2 断层附近天津市文化中心场点的加速度时程
Fig.2 Acceleration time history of the site in Tianjin Cultural Centre

图3 海河断裂6.5级地震加速度等值线图(图中虚线为断裂,★为破裂初始位置)<br/>Fig.3 Contour map of the accelerations of a hypothetic earthquake with MS 6.5 in Haihe Fault

图3 海河断裂6.5级地震加速度等值线图(图中虚线为断裂,★为破裂初始位置)
Fig.3 Contour map of the accelerations of a hypothetic earthquake with MS 6.5 in Haihe Fault

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备注

引言

1 随机有限断层法

2 海河断裂计算模型

3 计算结果及其分析

4 结论与讨论

期刊信息