Acta Scientiarum Naturalium Universitatis Pekinensis ›› 2022, Vol. 58 ›› Issue (4): 609-614.DOI: 10.13209/j.0479-8023.2022.042

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Distinguishing Underground Nuclear Test by Matrix Decomposition

ZHAO Kechang, ZHANG Xianbing†   

  1. School of Earth and Space Sciences, Peking University, Beijing 100871
  • Received:2021-05-21 Revised:2021-06-29 Online:2022-07-20 Published:2022-07-20
  • Contact: ZHANG Xianbing, E-mail: xbzhang(at)pku.edu.cn

用矩阵分解方法识别地下核爆炸

赵克常, 张献兵†   

  1. 北京大学地球与空间科学学院, 北京 100871
  • 通讯作者: 张献兵, E-mail: xbzhang(at)pku.edu.cn
  • 基金资助:
    国家自然科学基金(41374068)资助

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Abstract:

Using the seismic data of three underground nuclear tests and three nearby natural earthquakes, the focal seismic moment tensor is obtained by inversion, and the underground nuclear explosion is identified by matrix decomposition method. The results show that there are obvious explosion sources (EXP), compensated linear vector dipole (CLVD) source and double couple (DC) source in the source of underground nuclear explosion earthquake. The physical mechanism of CLVD is medium rupture caused by explosion, which accounts for a large proportion of underground nuclear explosion sources. Compared with underground nuclear explosion, natural earthquake is generally shear dislocation mode, and DC accounts for a large proportion of its source.

Key words: underground nuclear explosion, seismic moment tensor, EXP source, CLVD source, DC source

摘要：

利用3次地下核试验及其附近3次天然地震的地震资料, 反演获得震源地震矩张量, 通过矩阵分解方法识别地下核爆炸。结果表明, 地下核爆炸地震的震源中有较显著的爆炸源(EXP), 也有补偿线性矢量偶极(CLVD)源和双力偶(DC)源。CLVD的物理机理是爆炸引起介质破裂, 在地下核爆炸震源中占较大的比例。与地下核爆炸相比, 天然地震一般为剪切位错模式, 其震源中DC占较大的比例。

关键词: 地下核爆炸, 矩张量, 爆炸源(EXP), 补偿线性矢量偶极(CLVD)源, 双力偶(DC)源

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