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| 基于平滑伪魏格纳-维勒时频分析的地磁数据研究 | |
| 引用本文： | 廖晓峰,何康,张明东,何畅,魏强.基于平滑伪魏格纳-维勒时频分析的地磁数据研究[J].地震,2018,38(1):107-116. |
| 作者姓名： | 廖晓峰 何康 张明东 何畅 魏强 |
| 作者单位： | 1.四川省地震局, 四川 成都 610041; 2.安徽省地震局, 安徽 合肥 230031; 3.天津市地震局, 天津 300201 |
| 基金项目： | 2016年度震情跟踪定向工作任务(重点)(2016030505) |
| 摘 要： | 基于中国大陆西部地区(108°E以西)地磁台站数据, 利用平滑伪魏格纳-维勒(SPWVD)分析方法, 对其进行时频计算。 通过对2007年至2015年间的MS6.3以上强震(选取岷县地震、 芦山地震、 鲁甸地震3个典型震例)周围台站地磁Z分量滤波后周期为4.4 h的振幅变化进行分析, 得到如下结论: ① 在3个强震发生前, 周围台站的Z分量4.4 h振幅在1个月内都出现了多台同步高值异常; ② 岷县地震、 芦山地震发生前1个月内高值异常的频次明显增多, 频次高出全年平均水平2倍以上; ③ 3个强震发生前1个月内, 台站时频异常幅度明显增大, 幅值达到或接近台站全年的极值。 因此, SPWVD时频方法研究和总结的异常特征对未来西部地区强震预报具有一定的积极作用。 |
| 关 键 词： | SPWVD方法 地磁Z分量 前兆异常 |
| 收稿时间： | 2017-01-24 |
Time-frequency Analysis of Geomagnetic Data based on Smooth Pseudo-Wigner-Ville Distribution |
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| LIAO Xiao-feng,HE Kang,ZHANG Ming-dong,HE Chang,WEI Qiang.Time-frequency Analysis of Geomagnetic Data based on Smooth Pseudo-Wigner-Ville Distribution[J].Earthquake,2018,38(1):107-116. | |
| Authors: | LIAO Xiao-feng HE Kang ZHANG Ming-dong HE Chang WEI Qiang |
| Institution: | 1. Earthquake Administration of Sichuan Province, Chengdu 610041, China; 2. Earthquake Administration of Anhui Province, Hefei 230031, China; 3. Earthquake Administration of Tianjin, Tianjin 300201, China |
| Abstract: | We calculated time-frequency analysis of geomagnetic station data in Western China (West of 108°E) by the smooth pseudo-Wigner-Ville distribution( SPWVD), and studied the amplitude variation of 4.4 h period after filtering the geomagnetic Z component from 2007 to 2015. From three typical examples of the Minxian earthquake, the Lushan earthquake and the Ludian earthquake, we get some results: ① Before the threee earthquakes, the 4.4 h amplitude of the Z component of the surrounding stations had occurred simultaneous high value anomaly within one month; ② The frequency of high-value anomaly in the Minxian earthquake and the Lushan earthquake had increased significantly in one month, more than twice the annual average; ③ In one month before the three earthquakes, the time-frequency anomaly of the stations significantly increased, and the amplitude reached near the extreme value of the whole year. |
| Keywords: | Geomagnetic Z component Earthquake precursor SPWVD |
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