太原基准地震台核爆震相识别

Identification of nuclear explosion waveform recorded by Taiyuan Fundamental Seismic Station

对太原基准地震台记录的核爆及天然地震波形进行对比分析,结果显示:①与天然地震相比,核爆震相特征相对独特;②地震优势频率较窄,而核爆优势频率则较宽,即对于震中距相近、当量不同的核爆波形,太原台记录的时频变化特征相似;③对于震中距相近的天然地震与核爆波形,太原台记录的时频特征差异明显。

Comparing the waveform of nuclear explosions with that of the natural earthquakes recorded by Taiyuan Fundamental Seismic Station,the paper obtains the results as follows:①The phase characteristics of nuclear explosion are unique compared with that of natural earthquakes;②The dominant frequency band of natural earthquakes is narrow and that of nuclear explosions is relatively wider.Waveform from nuclear explosions with similar distance but different TNT equivalent has similar time-frequency features;③Waveform from natural earthquakes and nuclear explosions with similar distances has quite different time-frequency features.