| 基于粒子群优化的双力偶模型振幅谱反演方法及应用 |
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| 引用本文： | 郑建常,陈运泰.基于粒子群优化的双力偶模型振幅谱反演方法及应用[J].地震学报,2012,34(3):308-322. |
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| 作者姓名： | 郑建常 陈运泰 |
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| 作者单位： | 1) 中国北京100081中国地震局地球物理研究所
2) 中国济南250014山东省地震局 |
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| 基金项目： | 地震科技星火计划项目，山东省科技发展计划项目，中国地震局监测预报司震情跟踪定向工作任务项目，山东省地震局博士基金联合资助 |
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| 摘 要： | 发展了一种基于全波形振幅谱的频率域双力偶震源机制反演方法. 通过理论振幅谱与观测振幅谱的拟合搜寻断层面参数， 基于粒子群优化算法可以在较短的时间内得到稳定可靠的解． 数值试验表明, 在定位误差较大， 以及台站布局较差的情况下， 振幅谱反演仍可较为准确地得到震源机制， 并且由此计算得到的最优震源深度仍比较接近真实的震源位置． 使用该方法用2010年5月17日渤海ML4.0地震的震源机制进行了检验， 结果与加权P波初动解非常一致． 应用该方法对山东半岛及近海地区2003——2010年14次MLge;4.0地震震源机制进行了估计．
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| 关 键 词： | 矩张量 频率域 震源机制 粒子群优化 振幅谱 全波 |
Amplitude spectrum inversion for double-couple source model with particle swarm optimization algorithm |
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| Zheng Jianchang
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Chen Yun-tai.Amplitude spectrum inversion for double-couple source model with particle swarm optimization algorithm[J].Acta Seismologica Sinica,2012,34(3):308-322. |
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| Authors: | Zheng Jianchang Chen Yun-tai |
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| Institution: | 1) Institute of Geophysics, China Earthquake Administration, Beijing 100081, China2) Earthquake Administration of Shandong Province, Jinan 250014, China |
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| Abstract: | An inversion method is proposed to best fit the observation in frequency domain with synthetic amplitude spectra of full waveform in seismic source mechanism studies.Grid search is performed for finding fault parameters by correlating theoretical spectra with observations.Employing particle swarm optimization algorithm,stable and reliable solutions can be obtained in shorter time.Numerical test shows that,in the case of large location error and worse station coverage,the inversion can result in the solutions close to the given true focal mechanism,and the focal depth near the real focus.The method has been applied to processing local and regional recordings of the 17 May 2010 ML4.0 earthquake in Bohai Sea region.The result is in agreement with that obtained from P wave polarity analysis.We also estimated focal mechanism solutions of 14 ML≥4.0 earthquakes in Shandong peninsula and its adjacent sea area from 2003 to 2010. |
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| Keywords: | moment tensor frequency domain focal mechanism particle swarm optimization amplitude spectrum full waveform |
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