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2007年6月3日宁洱县境内发生6.4级地震,在地震区跨越宁洱东支断裂进行了为期14d的余震序列宽频带电磁异常连续观测。在固定台站的电场和磁场时间序列记录中,观测到多次余震事件的电磁同震现象。取每2h观测资料进行了加窗傅氏变换,得到不同频率的功率谱随时间的变化曲线。结果表明,MS3.0以上的余震发生前后,电磁场各分量频率谱峰值出现了显著的变化,地震后的峰值波动也许与时间域的同震效应相对应,而地震前发生的峰值跳跃有可能为电磁前兆现象。此外,本文对同震电磁信号产生机理进行了讨论,推测这种现象可能与地震发电机机制有关。
On June 3, 2007, a 6.4-magnitude earthquake occurred in Ning’er County, and a continuous anomalous broadband electromagnetic anomaly sequence was observed over the 14-day aftershock sequence across the Ning’er east-branch fault in the quake zone. In the time series records of electric field and magnetic field at fixed stations, electromagnetic coseismic phenomena of many aftershocks were observed. Take 2h observation data were carried out by Fourier transform, get the power spectrum of different frequencies with time curve. The results show that before and after the aftershocks above MS3.0, the peaks of the frequency spectrum of the electromagnetic field show significant changes. The peak fluctuations after the earthquake may correspond to the coseismic effects in the time domain. The peak jumps before the earthquake may be Electromagnetic precursor phenomenon. In addition, the mechanism of the coseismic electromagnetic signal is discussed in this paper. It is speculated that this phenomenon may be related to the mechanism of the seismic generator.