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通过对距离汶川地震余震区较近的武都地震台震前连续记录资料的傅里叶频谱特征分析,发现在震前临震阶段,频率为0.1~0.3Hz的地脉动幅值出现快速、持续地增大现象;连续跟踪观测和试验表明,该现象在2008年7~9月间发生的多次地震前在多个台站出现,这种现象具有重现性,在时间上具有持续性,在空间上由震中及其附近或某个“位置”向外围扩散。对该特殊频率波动的物理本质、与震源和孕震动力学过程的关系等研究有可能对临震预测具有意义。
Through the Fourier spectrum analysis of the continuous recorded data before the earthquake in Wudu seismic station near the Wenchuan earthquake aftershock zone, it was found that the amplitude of ground pulsations with frequency of 0.1-0.3 Hz appeared fast during the pre-earthquake quake, continuing The observation and experiment of continuous tracking show that this phenomenon occurred at several stations before the earthquakes occurred from July to September in 2008. This phenomenon is reproducible and time-sustaining, Spatially by the epicenter and nearby or a “position ” to the periphery of the proliferation. The research on the physical nature of this special frequency fluctuation, the relationship with the source and the seismogenic kinetic process may make sense for the projectile prediction.