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利用希尔伯特-黄变换方法对2013年芦山MS7.0地震前甘肃省平凉台、四川省成都台和云南省元谋台地电场观测资料进了分析研究。为增强对研究结果的说服力,还对平凉、成都和元谋地电场观测台站在正常时段变化情况,与地震发生前夕的处理结果进行了对比,对成都地电场观测台站在芦山MS7.0和汶川MS8.0地震前的变化情况也进行了对比分析,并得出:1希尔伯特-黄变换方法能够对地电场观测资料进行有效处理,处理结果简单直观;2在芦山地震前1~2个月地电场时频图出现能量增强现象,出现变化的周期范围约为90~1400h,能量最小变化幅度有3个数量级,最大变化幅度达到6个数量级;3通过上述三个地电场观测结果的对比,以及成都地电场观测结果的类比方式,大大提高了分析研究结果的可信度。在讨论部分,对地电场观测中能够观测到震前异常变化的可能性,从实验和数值模拟两个方面进行了相关论述。
The Hilbert-Huang transform method was used to analyze the electric field data of Pinglu station of Gansu province, Chengdu station of Sichuan province and Yuanmou station of Yunnan province before 2013 MS7.0 Lushan earthquake. In order to enhance the persuasiveness of the research results, the changes of electric field observation stations in Pingliang, Chengdu and Yuanmou at normal times were compared with those on the eve of the earthquake. In Chengdu Lvshan MS7.0 And Wenchuan MS8.0 before the earthquake also made a comparative analysis, and draw: 1 Hilbert-Huang transform method can effectively treat the ground electric field observations, the treatment results are simple and intuitive; 2 Lushan earthquake before 1 The time-frequency diagram of the electric field shows energy enhancement within ~ 2 months. The period range of change is about 90 ~ 1400h, and the minimum amplitude of energy change is 3 orders of magnitude and the maximum change range is 6 orders of magnitude. 3 Through the above three geoelectric field observations The comparison of the results and the analogy of the observation results of the geoelectric field in Chengdu have greatly enhanced the credibility of the analysis results. In the discussion part, the possibility of observing the anomalous changes before earthquakes can be observed in the geoelectric field observation, and the related expositions are discussed from two aspects of experiment and numerical simulation.