| 基于KiK-net数据的偏振分析方法计算震中方位角影响因素分析 |
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| 引用本文： | 范涛,李山有,陈志高,宋晋东,卢建旗.基于KiK-net数据的偏振分析方法计算震中方位角影响因素分析[J].大地测量与地球动力学,2019,39(2):215-220. |
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| 作者姓名： | 范涛 李山有 陈志高 宋晋东 卢建旗 |
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| 作者单位： | 中国地震局地震研究所地震预警湖北省重点实验室,武汉市洪山侧路40号,430071;中国地震局工程力学研究所地震工程与工程振动重点实验室,哈尔滨市学府路29号,150080 |
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| 基金项目： | 国家自然科学基金;湖北省技术创新专项;基本科研业务费项目;基本科研业务费项目;国家自然科学基金 |
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| 摘 要： | 基于日本KiK-net强震动观测记录,以提高计算震中方位角的准确性为目标,研究记录参量(加速度、速度、位移)、计算时间窗和滤波频带对偏振分析方法计算震中方位角结果的影响。结果表明,在该研究的地震数据条件下,采用位移记录、计算时间窗为1s、滤波频带取0.1～20Hz时,可以获得最佳的震中方位角计算结果,震中方位角的计算偏差为45°时所占比例为88%。
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| 关 键 词： | 偏振分析 震中方位角 高铁地震预警 |
Analysis of Factors Impacting Polarization Analysis Method in DeterminingEpicentral Azimuth Based on Data from KiK-net |
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| FAN Tao,LI Shanyou,CHEN Zhigao,SONG Jindong,LU Jianqi.Analysis of Factors Impacting Polarization Analysis Method in DeterminingEpicentral Azimuth Based on Data from KiK-net[J].Journal of Geodesy and Geodynamics,2019,39(2):215-220. |
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| Authors: | FAN Tao LI Shanyou CHEN Zhigao SONG Jindong LU Jianqi |
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| Institution: | (Hubei Key Laboratory of Earthquake Early Warning,Institute of Seismology,CEA,40 Hongshance Road,Wuhan 430071,China;Key Laboratory of Earthquake Engineering and Engineering Vibration,Institute of Engineering Mechanics,CEA,29 Xuefu Road,Harbin 150080,China) |
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| Abstract: | In this paper, three main factors which directly influence the precision of determining the epicentral azimuth, namely ground-motion type, time window length and filter band, are analyzed by the polarization analysis method, based on part of KiK-net strong motion data. Results show that azimuth determined by ground displacement is outstanding compared to that determined by ground acceleration and ground velocity. Meanwhile, with calculation-time window to be valued around 1 s and filtering band to be valued between 0.1-20 Hz makes the epicentral azimuth determination results best. The results of 45-degree deviation percentage can be 88%. |
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| Keywords: | polarization analysis epicenter azimuth earthquake early warning (EEW) of high speed railway |
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