Simulating the near-fault large velocity pulses of the Chi-Chi (Mw7.6) earthquake with kinematic model
Simulating the near-fault large velocity pulses of the Chi-Chi (Mw7.6) earthquake with kinematic model
复制标题
用运动学模型模拟Chi-Chi（Mw7.6）地震的近断层高速脉冲
DOI：
10.1007/s10950-018-9791-4
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发表时间：
2018-09
影响因子：
1.6
通讯作者：
Zhou Dian
中科院分区：
文献类型：
--
作者：
Luo Quanbo;Chen Xueliang;Gao Mengtan;Li Zongchao;Zhang Zhen;Zhou Dian
1999年台湾集集7.6级地震所记录到的大量脉冲为本研究提供了重要的资料。对大震产生的近断层速度脉冲的预测可以为工程抗震设计提供一定的参考。本文在建立震源模型和速度结构模型的基础上，尝试用三维有限差分法对39个近断层大速度脉冲进行数值模拟。研究结论如下：（1）由三维弯曲面构造的两段“铲状”断层模型能更好地描述地下真实的断层特征。(2)六个微凸体的地震矩和上升时间决定了速度脉冲的峰值和周期。位于浅低角度的微凸体主要影响水平脉冲分量，而位于高角度的微凸体对垂直脉冲分量的贡献更大。(3)断层南北两端滑动性质的差异导致水平脉冲分量的差异，反映了断层的冲阶效应和方向性效应的特征。(4)速度反应谱的特征周期在断层北端的转折点附近有最大值，在断层附近区域表现出非常明显的上盘效应，导致大型结构因共振效应大而发生严重破坏。(5)峰值地面速度（PGV）沿断层由南向北沿着逐渐增大，上盘PGV明显大于下盘PGV，破裂前脉冲分布较宽，破裂后脉冲分布较窄。由于模拟结果与真实的记录基本一致，这也验证了用三维有限差分法模拟脉冲型地震动的可行性。
The large number of pulses recorded during the 1999Mw7.6 Chi-Chi Taiwan earthquake provided an important data for this study. The prediction of near-fault velocity pulses generated by large earthquakes can provide some reference for the Engineering anti-earthquake design. Based on the established source model and velocity structure model, this paper attempts to use the 3D finite difference method to simulate the 39 near-fault large velocity pulses. The conclusions are the following: (1) Two-segment “shovel-like” fault model constructed by 3D bending plane can better describe the characteristics of the underground real fault. (2) The seismic moment and rise time of the six asperities determine the peak and period of the velocity pulse. The asperities located at shallow low angle mainly affect the horizontal pulse components, and the asperities at high angle contribute more to the vertical pulse component. (3) The difference in sliding properties between the north and south ends of the fault causes a difference in the horizontal pulse components, reflecting the characteristics of the fling-step effect and directivity effect. (4) The characteristic period of the velocity response spectrum has the maximum near the turning point at the north end of the fault and shows a very obvious hanging wall effect in the near-fault region, resulting in the large-scale structures having severe damage because of large resonance effect. (5) Peak ground velocity (PGV) gradually increases from south to north along the fault and PGV on the hanging wall is significantly larger than PGV on the footwall, and the distribution of the pulses in front of the rupture is wider than that of the rear. Because the simulation results are basically consistent with the real records, this also verifies the feasibility of simulating pulse-like ground motions with the 3D finite difference method.
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DOI：
10.1186/bf03352855
发表时间：
2008-10
期刊：
Earth, Planets and Space
影响因子：
--
作者：
S. Murotani;H. Miyake;K. Koketsu
通讯作者：
S. Murotani;H. Miyake;K. Koketsu
影响因子：
3
作者：
T. Ohminato;B. Chouet
通讯作者：
T. Ohminato;B. Chouet
影响因子：
3
作者：
Baker, Jack W.
通讯作者：
Baker, Jack W.
DOI：
10.1029/98jb00613
发表时间：
1998-09
期刊：
Chinese Journal of Geophysics
影响因子：
--
作者：
Chau-Huei Chen;T. Teng;Y. Gung
通讯作者：
Chau-Huei Chen;T. Teng;Y. Gung
影响因子：
1.1
作者：
Jeen‐Hwa Wang;Ming-Wey Huang;Kou‐Cheng Chen;R. Hwang;Wen-Yen Chang
通讯作者：
Jeen‐Hwa Wang;Ming-Wey Huang;Kou‐Cheng Chen;R. Hwang;Wen-Yen Chang