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利用边际谱方法对2008年5月12日四川汶川地震前天基和陆基电场变化情况进行了联合分析研究,结果表明:(1)空间电场方面,由重复轨道和连续轨道电场边际谱演化看出,电离层电场从2008年4月27日左右开始,其边际谱出现了明显的增强现象(增大1～2个量级),这种现象一直持续到汶川地震发生.(2)陆基电场方面,中法合作的松山台从4月25日～29日开始出现电场边际谱增强现象(增大2个量级),成都台、陇南台和天水台在4月10日～14日开始出现了边际谱增强现象(增大2个量级),天水台和陇南台边际谱增强现象出现时间与成都台相差不大,但结束时间不完全相同,松山台、天水台的结束时间要早于陇南台和成都台.(3)陆基和空间电场边际谱出现增强现象的时间来看,二者有较好的一致性.
The marginal spectral method was used to analyze the changes of the ground-based and land-based electric fields before the Wenchuan earthquake in Sichuan on May 12, 2008. The results show that: (1) in terms of the space electric field, the marginal spectral evolution of the electric fields in the repeated orbits , The ionospheric electric field starts from April 27, 2008, and the obvious enhancement (up to 1 or 2 orders of magnitude) appears in the marginal spectrum. This phenomenon lasted until the Wenchuan earthquake occurred. (2) Ground-based electric field As for the Matsuyama station cooperated by China and France, the electric field marginal spectrum enhancement phenomenon (2 orders of magnitudes) started to occur from April 25 to April 29, and Chengdu, Longnan and Tianshui stations began to emerge from April 10 to April 14 For marginal spectrum enhancement (two orders of magnitude increase), the time between Tianshui station and Longnan station marginal spectrum enhancement is not much different from that of Chengdu station, but the ending time is not exactly the same. The ending time of Songshan station and Tianshui station is earlier than that of Chengdu station Longnan and Chengdu stations. (3) In terms of the time when the marginal spectrum of ground-based and space electric fields appears to be enhanced, the two have better consistency.