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本文应用非线性谱估计方法(MEM方法)、电/磁场脉冲能量统计方法,处理了四川汶川M_S8.0(2008)、新疆于田M_s7.3(2008)和青海玉树M_s7.1(2010)地震及强余震附近的地面电/磁场和Demeter卫星电离层磁场观测数据,研究了地震电/磁场变化,得到:在震中附近及周围出现了震前地电/地磁场极低频成分功率谱密度(PSD)增大、电磁脉冲能量增大的电/磁异常现象;在出现地面电磁异常的时段内,电离层磁场出现了PSD增大、磁脉冲能量增大的震前磁异常现象.最后,我们讨论了地面、电离层电磁异常现象的机制.
In this paper, we apply the nonlinear spectrum estimation method (MEM method) and the electric / magnetic pulse energy statistics method to deal with the Wenchuan M_S8.0 (2008), Yutian M_s7.3 (2008) and M_s7.1 (2010) And the ground electric / magnetic field near strong aftershocks and the ionospheric magnetic field data of Demeter satellite, the change of electric / magnetic field of the earthquakes is studied. The power spectral density of the very low frequency component of the geoelectric / geomagnetic field before the epicenter (PSD ) Increases, and the energy of electromagnetic pulse increases. During the time when ground electromagnetic anomaly occurs, the magnetic anomalies before the earthquake in the ionospheric magnetic field increase and the magnetic pulse energy increases. Finally, we discuss The ground, ionospheric electromagnetic anomaly mechanism.