| 基于HHT提取昆明、下关重力固体潮的地震前兆信息 |
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| 引用本文： | 周挚,山秀明,张立,傅容珊,梁虹,全海燕.基于HHT提取昆明、下关重力固体潮的地震前兆信息[J].地球物理学报,2008,51(3):836-844. |
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| 作者姓名： | 周挚 山秀明 张立 傅容珊 梁虹 全海燕 |
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| 作者单位： | 1.云南省地震局,昆明 650224;2.清华大学电子工程系,北京 100084;3.中国科技大学地球和空间科学学院,合肥 230026;4.云南大学信息学院,昆明 650091;5.昆明理工大学信息工程与自动化学院,昆明 650051 |
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| 基金项目： | 国家自然科学基金，国家科技攻关计划，云南省自然科学基金 |
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| 摘 要： | 在重力固体潮地震前兆分析中引入HHT时频分析新方法.结合HHT的优越性、固体潮的特点和地震的非平稳过程特性，设计重力固体潮地震前兆分析的瞬时频率特征参数；以相应理论计算值作为参照背景，研究固体潮的震前变化特征.昆明、下关的震例分析表明, 的确存在瞬时频率特征参数的震前变化，且具短期、同步正异常特征；瞬时频率特征参数具有明确的物理意义，其震前变化反映了地震非平稳过程对理论重力固体潮的影响.
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| 关 键 词： | 重力固体潮 HHT 瞬时频率 地震前兆 |
| 收稿时间： | 2007-4-29 |
| 修稿时间： | 2008-2-21 |
The gravity tide of Kunming & Xiaguan based on the HHT |
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| ZHOU Zhi,SHAN Xiu-Ming,ZHANG Li,FU Rong-Shan,LIANG Hong,QUAN Hai-Yan.The gravity tide of Kunming & Xiaguan based on the HHT[J].Chinese Journal of Geophysics,2008,51(3):836-844. |
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| Authors: | ZHOU Zhi SHAN Xiu-Ming ZHANG Li FU Rong-Shan LIANG Hong QUAN Hai-Yan |
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| Institution: | 1.Earthquake Administration of Yunnan Province, Kunming 650224, China;2.Electronic Engineering Department, Tsinghua University, Beijing 100084, China;3.School of Earth and Space Science, University of Science and Technology of China, Hefei 230026, China;4.Information School, Yunnan University, Kunming 650091, China;5.Information Engineering and Automatism School, Kunming University of Science and Technology, Kunming 650051, China |
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| Abstract: | HHT time-frequency method is introduced in new analysis of gravity tide. Based on superiority of HHT, the character of gravity tide and nonstationary processes of earthquake, we design characteristic parameters of instantaneous frequency of gravity tide. And we refer to corresponding theoretical values of gravity tide in the course of earthquakes analysis. The results of Kunming and Xiaguan show that there are some premonitory changes in the characteristic parameters of instantaneous frequency before earthquakes, which bear short-term and synchronization characters. The characteristic parameters of instantaneous frequency have clear physical significance. These premonitory changes express that the nonstationary processes of earthquake influenced the observation of stationary processes of gravity tide. |
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| Keywords: | HHT |
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