| 采用功率谱方法提取地球自由振荡信息 |
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| 引用本文： | 丁亮,武晔,王家阔,高家乙.采用功率谱方法提取地球自由振荡信息[J].防灾技术高等专科学校学报,2012(1):64-71. |
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| 作者姓名： | 丁亮 武晔 王家阔 高家乙 |
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| 作者单位： | [1]防灾科技学院地震科学系,河北三河065201 [2]石家庄威特工程检测有限公司,河北石家庄065000 |
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| 基金项目： | 中国地震局教师科研基金项目（20110101）; 防灾科技学院大学生创新项目（地球自由振荡的Q值提取方法研究） |
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| 摘 要： | 利用中国数字地震台网的三个台站所记录到的2011年日本里氏9.0级地震的地震数据,在没有进行去固体潮的前提下进行功率谱分析,获得了地球球型自由振荡振型,通过与PREM模型相对比,发现所提取的94个振型,包括76个基频振型（0S0,2S0～0S76）和18个谐频振型,与理论值的误差很小,所有数据的平均偏差为0.14%。文中发现该地震激发的0S2,0S3,0S4和1S2自由振荡振型有明显的频谱分裂现象。
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| 关 键 词： | 功率谱密度估计 地球自由振荡 球型振荡 |
Earth Free Oscillation Mode Extracted by Power Spectrum Density Method |
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| Ding Liang,Wu Ye,Wang Jiakuo,Gao Jiayi.Earth Free Oscillation Mode Extracted by Power Spectrum Density Method[J].Journal of College of Disaster Prevention Techniques,2012(1):64-71. |
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| Authors: | Ding Liang Wu Ye Wang Jiakuo Gao Jiayi |
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| Institution: | 1.Institute of Disaster Prevention,Sanhe,Hebei 065201,China; 2.Shijiazhuang Weite Engineering Testing Co.,Ltd,Shijiazhuang,Hebei 050000) |
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| Abstract: | An M9.0 earthquake struck Japan on March 11,2011 and the strong earthquake made continuous oscillation of the earth.Using the 5-day seismic waveform data recorded by China Digital Seismograph Network（CDSN） after the earthquake,we studied the data of VHZ channel by power spectral density estimation.We extracted 76 spherical modes of（0S0,0S2~0S76） of the earth＇s free oscillation and other 18 modes and they are consistent and nearly same with the frequencies of the modes of Preliminary Reference Earth Model（PREM）.Spectral split ting phenomenon is observed obviously in 0 S2,0 S3,0 S4 and 1 S2 free oscillation modes. |
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| Keywords: | Power spectral density estimation Earth free oscillation Spheroidal mode |
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