Yield Estimation and Event Discrimination of the 4 August 2020 Beirut Chemical Explosion
Yield Estimation and Event Discrimination of the 4 August 2020 Beirut Chemical Explosion
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DOI：
10.1785/0220210363
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发表时间：
2022-05
影响因子：
3.3
通讯作者：
Lei Zhang;Lian‐Feng Zhao;Xiao-Bi Xie;Xi He;Z. Yao
中科院分区：
文献类型：
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作者：
Lei Zhang;Lian‐Feng Zhao;Xiao-Bi Xie;Xi He;Z. Yao
我们根据陆上和离岸台站记录的区域地震数据对2020年8月4日贝鲁特化学爆炸事故进行了调查。贝鲁特爆炸的lg波体波震级为mb(Lg)=3.30±0.46。用基于全埋爆源模型的经验震级-当量关系计算得到的爆炸当量仅为0.112 kt。或者，利用产量与弹坑大小之间的经验关系估计的产量为1.22kt，不确定度在0.48至2.3kt之间。后者更接近现实。计算了贝鲁特大爆炸及附近天然地震的P/S谱振幅比，包括Pg/Lg、Pn/Lg和Pn/Sn。结果表明，P/S谱比能有效地区分西北阿拉伯板块的爆炸和地震。通过比较贝鲁特大爆炸、响水大爆炸和天津大爆炸与历史核爆炸、埋藏小化学爆炸和天然地震的波谱比，进一步研究了不同震源类型之间网络平均P/S波谱比的详细差异。
We investigate the 4 August 2020 Beirut accidental chemical explosion based on regional seismic data recorded at both on- and off-shore stations. The Lg-wave body-wave magnitude is mb(Lg)=3.30±0.46 for the Beirut explosion. The explosive yield obtained using an empirical magnitude-yield relation based on a fully buried explosion source model is only 0.112 kt. Alternatively, the yield estimated using an empirical relation between the yield and crater size is 1.22 kt, with the uncertainties between 0.48 and 2.3 kt. The latter is closer to reality. The P/S spectral amplitude ratios, including Pg/Lg, Pn/Lg, and Pn/Sn, are calculated for the Beirut explosion and nearby natural earthquakes. We find the P/S spectral ratios are effective in discriminating the explosion from earthquakes in the Northwestern Arabia plate. By comparing the spectral ratios of large open-pit explosions, including the Beirut, Xiangshui, and Tianjin explosions, with those from historical nuclear explosions, buried small chemical explosions, and natural earthquakes, we further investigate the detailed differences of network-averaged P/S spectral ratios between different source types.