震源性质的时频分析与事件识别

应用时频分析技术研究了近年来发生在朝鲜半岛的核爆炸、化学爆炸与天然地震事件的识别问题,计算了上述三者的瞬时频率、瞬时振幅谱与群延迟等多项参数,提出地震与爆炸的识别指标.初步研究结果表明,对较大事件,上述三者来自震源的激发频率信息有明显差异性,核爆炸源激发的频率明显高于地震,化学爆炸最低.特别是,这些信息指标对于识别小当...

Time-frequency analysis for source characteristics and discriminations for events

Time-frequency analysis technique, in this paper, was applied to study and discriminate earthquakes and explosions occurring in Korea peninsula. The instantaneous frequency, am- plitude spectra, group delay and etc. for seismic and explosion waves were calculated. In the meantime, some discriminating indices for explosions and earthquakes were proposed. Re- sults showed that the frequency information by exciting out of the sources mentioned above were different obviously. The frequency information by exciting out of the nuclear explosion source was quite higher than that of earthquakes and that of the chemical explosion was the lowest. In view of what above mentioned, we proposed some discrimination indexes so as to discriminate the differences of earthquakes and explosions, especially, the indexes abovementioned to discriminate some small events were also useful.