Yield Estimation of the 25 May 2009 North Korean Nuclear Explosion
Yield Estimation of the 25 May 2009 North Korean Nuclear Explosion
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DOI：
10.1785/0120110163
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发表时间：
2012-04
影响因子：
3
通讯作者：
Lian‐Feng Zhao;Xiao-Bi Xie;Weimin Wang;Z. Yao
中科院分区：
文献类型：
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作者：
Lian‐Feng Zhao;Xiao-Bi Xie;Weimin Wang;Z. Yao
我们为区域地震网络收集了 2009 年 5 月 25 日朝鲜核爆炸的 9 个垂直分量宽带地震图，其中八个台站还记录了 2006 年 10 月 9 日朝鲜核试验。比较两个事件观测到的波形和频谱，我们估计第二个事件记录的振幅大约是第一个事件记录的振幅的五倍。此外，我们使用 1995 年 12 月至 2009 年 5 月期间区域网络记录的 82 个区域事件的 599 个垂直宽带地震图来校准网络 Lg 波震级。校准网络用于计算 2009 年 5 月 25 日朝鲜核爆炸的 Lg 波体波震级 m b( Lg )=4.53。根据朝鲜两次核爆炸的15个先到信号，计算出中朝东北地区的区域Pn速度为8.0公里/秒。这一结果与区域地质结构一起表明朝鲜试验场（NKTS）位于相对稳定的大陆地区。因此，我们使用修改后的完全耦合震级-当量关系来估计爆炸当量，结果表明，在最小埋深假设下，2009 年 5 月 25 日朝鲜核试验的当量约为 2.35 kt。
在线材料：研究中使用的 82 个事件的震中参数、计算 m b( Lg ) 和校正 m b( Lg )。
We collect nine vertical component broadband seismograms from the 25 May 2009 North Korean nuclear explosion for a regional seismic network in which eight stations also recorded the 9 October 2006 North Korean nuclear test. Comparing the observed waveforms and spectra from the two events, we estimate that the amplitudes of the records from the second event are approximately five times those from the first one. Additionally, we use 599 vertical broadband seismograms from 82 regional events recorded on the regional network between December 1995 and May 2009 to calibrate the network Lg ‐wave magnitude. The calibrated network is used to calculate the Lg ‐wave body‐wave magnitude m b( Lg )=4.53 for the 25 May 2009 North Korean nuclear explosion. Based upon 15 first arrivals from the two North Korea nuclear explosions, the regional Pn velocity in the northeast China–North Korea region is calculated to be 8.0 km/s. This result, along with the regional geological structures, suggests that the North Korean test site (NKTS) is located at a relatively stable continental region. We thus use a modified fully coupled magnitude–yield relation to estimate the explosion yield, and the result shows that the yield of the 25 May 2009 North Korean nuclear test is approximately 2.35 kt under the minimum burial depth assumption.
Online Material: Epicentral parameters, computed m b( Lg ), and corrected m b( Lg ) for 82 events used in the study.