汶川地震临震地脉动记录特殊频率波动现象及其重现性初步研究

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，发现震前临震阶段0．1～0．3Hz频率的幅值出现快速、持续的增大现象；进一步实时连续跟踪观测和试验表明，该现象在7—9月间发生的多次地震前在多个台站出现，表现出现象的重现性、时间进程上的持续性和过程属性，空间上由震中及其附近或某个“中心”区域向外围扩散等特性。对该特殊波动的物理本质、与震源和孕震动力学过程的关系等研究有可能对临震预报具有实际意义。

Preliminary Study on the Tremors with Special Frequency Recorded by Seismograph Before Wenchuan Earthquake and Its Charaters

Through the analysis of Fourier spectrum of the continuous record at Wudu Seismological Station near the after-shock zone of the Wenchuan Earthquake,it is found that amplitude within 0.1~0.3 Hz increased rapidly just before Wenchuan earthquake. Further real-time observation shows that such phenomenon was observed by various stations before several aftershocks happened from July to September,2008,exhibiting repeatability in phenomenology,Study on the physical nature of the special fluctuation,its relationshi...