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应用全局小波能谱法对2008年四川汶川MS8.0地震、2010年青海玉树MS7.1地震前地电、地磁场变化情况进行了分析研究.结果表明:①在汶川地震震中周围的台站观测到震前地电、地磁场全局小波能谱值增大的现象;②青藏高原东北缘的代乾等3个地电、地磁台站在玉树地震前均发生显著的小波能谱增大的现象,震后恢复;③对于上述两次大震周边地区的不同台站的不同测道,在震前多次出现谱值时间上同步增大或减少的现象;④距玉树地震震中距离相同的山丹和古丰地电场台站,北南、北西测向长极距在地震前后能谱值的变化几乎一致.基于上述分析,初步研究认为震源孕育激发的电磁辐射是造成震前电磁异常现象的主要原因.
The global electric potential and geomagnetic field changes of Wenchuan MS8.0 earthquake in 2008 and MS7.1 of Yushu in Qinghai Province in 2010 were analyzed by using global wavelet energy spectrum method.The results show that: (1) Observations of stations around the epicenter of the Wenchuan earthquake Before the earthquake, the global wavelet energy spectrum of the geomagnetic field increased; ② Significant increase of the wavelet energy spectrum occurred in all 3 geoelectric stations before the northeastern margin of the Qinghai-Tibet Plateau and before the Yushu earthquake , And recovered after the earthquake; (3) For different stations at different stations around the two major earthquakes, the phenomenon of increasing or decreasing synchronously with the spectrum value occurred many times before the earthquake; (4) the same mountain distance from the epicenter of the Yushu earthquake Based on the above analysis, the preliminary study shows that the electromagnetic radiation stimulated by the source is the cause of the anomalous electromagnetic anomalies before the earthquake main reason.