个旧地震台核爆震相识别

IDENTIFICATION OF NUCLEAR DETONATION PHASE AT GEJIU SEISMIC STATION

采用个旧地震台2016~2017年记录到的2次朝鲜核试验及2次韩国天然地震的波形和背景噪声记录,通过运用测震学分析并结合频谱分析方法,对核试验、天然地震在震相、频谱方面的区别进行了研究。研究结果表明,相近地区的核试验波形与天然地震事件相比,二者在震相、面波、持续时间等方面差异较大;受震中距较大及震级较小影响,所选核试验波形与天然地震在时频特征上无明显差异,与背景噪声相比有一定区别。

Based on the waveform records of two North Korean nuclear tests and two South Korean natural earthquakes recorded by Gejiu seismic station from 2016 to 2017,the differences in seismic phase and spectrum between nuclear test and natural earthquake are studied by using seismological analysis and spectrum analysis method.The results show that the waveforms of nuclear tests in the same nearby area are compared with those of natural earthquake events, the phase characteristics of nuclear test waveform are quite different from those of natural earthquake in phase, surface wave and duration time, and their time are obviously different.There is no obvious difference in time-frequency characteristics between the nuclear test waveform and natural earthquake, but there is certain difference between the nuclear test waveform and the background noise used in this paper.