通过对频谱图进行研究、分析、获取次声波的相关信息，从而对地质灾害进行监测与预警。
Through the analysis and research on the spectrum diagram, the related information of device were accessed, thus to monitor and warn the geological hazards.
提出的孕震体膨胀-收缩模型的确能在空气中产生次声波，且次声波的主要频率是孕震体膨胀-收缩周期的倒数；
The results showed that the proposed model could produce infrasound which frequency agrees well with the observed and it might be a true mechanism of infrasound abnormality formation.
我们想知道的是他们是否能检测到地面上这些次声波。
What we want to know is if they can detect those rumbles in the ground.
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