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| 基于伪魏格纳-维勒分布的地磁场时频分析研究以中国大陆东部地区为例 | |
| 引用本文： | 张明东,何康,廖晓峰,丁晶,曹颖.基于伪魏格纳-维勒分布的地磁场时频分析研究以中国大陆东部地区为例[J].地震,2018,38(1):61-73. |
| 作者姓名： | 张明东 何康 廖晓峰 丁晶 曹颖 |
| 作者单位： | 1.天津市地震局, 天津 300201; 2.安徽省地震局, 安徽 合肥 230031; 3.四川省地震局, 四川 成都 610041; 4.中国科学技术大学地球与空间科学学院, 安徽 合肥 230026 |
| 基金项目： | 天津市“十二五”地震监测技术系统完善与建设项目和2016年度震情跟踪定向工作任务(重点)(2016030506)资助 |
| 摘 要： | 使用伪魏格纳-维勒时频分析方法, 对中国大陆东经108°以东, 2007年至2015年M4.5以上地震进行分析, 发现: ① 在震前3个月内, 伪魏格纳-维勒时频分析高值异常的异常频次增多, 异常密度加大, 异常频次密度相比于全年平均水平上升2~3倍左右。 ② 震中距200 km以内, 异常较为明显, 具有异常幅度随震中距增大而幅度减小的特征, 且震前1个月内有出现全年极值的可能。 因此, 当短时间内(1~3个月)出现异常频次明显增多(排除外空场影响), 异常频次密度达到全年平均水平的2~3倍时, 应注意该异常区200 km范围内发生M4.5左右地震的可能。 |
| 关 键 词： | 电磁前兆 伪魏格纳-维勒方法 前兆信息提取 中国大陆东部 |
| 收稿时间： | 2017-01-23 |
Time-frequency Analysis of Geomagnetic Field based on Pseudo-Wigner-Ville Distribution in Eastern China |
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| ZHANG Ming-dong,HE Kang,LIAO Xiao-feng,DING Jing,CAO Ying.Time-frequency Analysis of Geomagnetic Field based on Pseudo-Wigner-Ville Distribution in Eastern China[J].Earthquake,2018,38(1):61-73. | |
| Authors: | ZHANG Ming-dong HE Kang LIAO Xiao-feng DING Jing CAO Ying |
| Institution: | 1.Earthquake administration of Tianjin, Tianjin 300201, China; 2.Earthquake administration of Anhui, Hefei 230031, China; 3.Earthquake administration of Sichuan, Chengdu 610041, China; 4.College of Earth and Space Sciences, USTC, Hefei 230026, China |
| Abstract: | Using time-frequency analysis method based on the pseudo-Wigner-Ville distribution(SPWVD), we analyzed earthquakes greater than MS4.5 between 2007 and 2015 and east of 108°E. We found that ① 3 months before the earthquakes, the SPWVD time-frequency analysis of the abnormal high value anomaly frequency increased, and anomaly density also increased. Abnormal frequency density rise around 2—3 times compared to the year average. ② The epicenter distance is within 200 km, and the anomaly is relatively obvious, abnormal amplitude with the epicenter distance increased, and the characteristics of amplitude decreases, and within a month before the earthquake has the potential of full-year extremum. Therefore, when abnormal frequency increased markedly in a short period of time (1—3 months) (excluding outer influence), abnormal frequency density reached 2 to 3 times the average for the whole year, we should pay more attention to possible MS4.5 earthquake in the abnormal area of 200 km range. |
| Keywords: | Time-frequency analysis SPWVD method Precursor informational extraction Eastern China |
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