| 近断层速度脉冲与震源机制的关系浅析 |
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| 引用本文： | 罗全波,陈学良,高孟潭,李宗超,李铁飞,张振.近断层速度脉冲与震源机制的关系浅析[J].震灾防御技术,2018,13(3):646-661. |
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| 作者姓名： | 罗全波 陈学良 高孟潭 李宗超 李铁飞 张振 |
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| 作者单位： | 中国地震局地球物理研究所, 北京 100081 |
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| 基金项目： | 国家自然科学基金（51678537）和国家重点研发计划（2017YFC1500205）共同资助 |
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| 摘 要： | 本文初步分析了近断层速度脉冲的成因和特点，主要包括方向性效应与滑冲效应，并通过中国台湾集集地震的脉冲记录，分析了断层破裂方向和位移大小等震源参数对脉冲强度的影响。此外，基于有限移动源理论，说明了断层辐射与速度脉冲分布的关系，并探讨了利用运动学震源模型研究近断层地震动对速度脉冲影响的技术路线；评述了7种典型的等效速度脉冲模型，建议进一步研究等效速度脉冲函数与震源机制之间的关系。最后，简述了不同类型的断层引起速度脉冲的差异，并推测了产生脉冲型地震动的下限条件，同时展望该研究在地震预警方面的可能性。
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| 关 键 词： | 震源机制 近断层速度脉冲 等效脉冲模型 运动学震源模型 地震动模拟 |
| 收稿时间： | 2017/11/24 0:00:00 |
Relationship between Near-fault Velocity Pulse and Focal Mechanism |
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| Luo Quanbo,Chen Xueliang,Gao Mengtan,Li Zongchao,Li Tiefei and Zhang Zhen.Relationship between Near-fault Velocity Pulse and Focal Mechanism[J].Technology for Earthquake Disaster Prevention,2018,13(3):646-661. |
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| Authors: | Luo Quanbo Chen Xueliang Gao Mengtan Li Zongchao Li Tiefei and Zhang Zhen |
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| Institution: | Institute of Geophysics, China Earthquake Administration, Beijing 100081, China |
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| Abstract: | This paper preliminary analyzed the causes and characteristics of the near-fault velocity pulse, including the directivity effect and fling-step effect. The influence of source parameters, such as fault rupture direction and displacement on pulse intensity, is analyzed by using the pulse records of the Chi-Chi earthquake. Based on the theory of finite displacement source, the relationship between fault radiation and velocity pulse distribution is described, and the technical route to study the influence of near-fault ground motion on the velocity pulse by the kinematic source model is discussed. Seven typical equivalent velocity pulse models are reviewed. It is suggested to further study the relationship between the equivalent velocity pulse function and the focal mechanism. The different faults will cause differences in velocity pulses, and the lower limit condition of pulse-type ground motion is deduced. The possibility of the application in earthquake warning is expected. |
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| Keywords: | Focal mechanism Near-fault velocity pulse Equivalent pulse model Kinematic source model Ground motion simulation |
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