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《Chinese Journal of Geophysics》 2015-03
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Comparative study on seismological characteristics of 2009 and 2013 nuclear explosions in North Korea

TIAN You;LIU Yun-Long;LIU Cai;FENG Xuan;ZHENG Que;College of Geo-Exploration Science and Technology,Jilin University;  
Although the UN passed"Comprehensive Nuclear-Test-Ban Treaty"as early as 1996,facing the international situation,it is also necessary to study the recognition method of nuclear explosions and to apply it to discrimination of earthquakes and nuclear explosions.In this study we make a comparison of seismic characteristics of the two North Korean nuclear tests on 25May2009 and on 12 February 2013by using the waveform data from these two events recorded by temporary seismic stations located in the Changbai Shan region and obtain the seismological characteristics of the two nuclear explosions in order to reach the aim of recognizing nuclear explosions.Because there exist obvious differences in the phase′s amplitude and frequency between nuclear tests and earthquakes,we use the method of P/S mode spectral ratios to recognize the North Korean′s nuclear explosions by using the data with epicentral distances from 145 to 420km.Amplitude spectrum ratios of regional Pg phase(waveforms of stations and selected reference stations)are used to calculate the relative attenuation factor(δt*)on the ray path between the North Korean nuclear explosion and the stations.P/S-style spectral ratios exhibit obvious disparities at frequency 3~11Hz by comparing the North Korean underground nuclear tests with the earthquakes in Changchun and Shenyang,i.e.Pn/Lg1for nuclear explosions and Pn/Lg1for earthquakes.The Pg/Lg spectral ratio of the2013 nuclear test is obviously larger than that of the 2009 nuclear test.In addition,the distribution ofδt*shows that the larger attenuations of stations are distributed in the southeast and nearby the Changbai Shan volcano.The closest station(in Changbai County)presents low attenuation and the farthest station(in Changchun city)presents largest attenuation.P/S-mode spectral ratios effectively discriminate North Korean underground nuclear tests at frequency above 3Hz by comparison with earthquakes.The released energy of the 2013 nuclear test is more than that of the 2009 nuclear test by comparing the amplitude spectra of the two nuclear explosions.The distribution of attenuation which reflects the attenuation structure of crust and upper mantle is related to the locations of magma chambers and consistent with the velocity model in the study area.
【Fund】: 国家自然科学基金项目(41174068 41474030 41430322);; 国家高技术研究发展计划(863)(2012AA052801);; 油页岩勘探开发利用产学研用合作创新研究项目(OSP-02 OSR-02);; 公益性行业科研专项项目(201011078);; 加拿大国际合作项目(35-06Z030091W);; 吉林大学基本科研业务费项目联合资助
【CateGory Index】: P315.728
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