High‐Precision Relocation and Event Discrimination for the 3 September 2017 Underground Nuclear Explosion and Subsequent Seismic Events at the North Korean Test Site
High‐Precision Relocation and Event Discrimination for the 3 September 2017 Underground Nuclear Explosion and Subsequent Seismic Events at the North Korean Test Site
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DOI：
10.1785/0220180164
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发表时间：
2018-09
影响因子：
3.3
通讯作者：
Xi He;Lian‐Feng Zhao;Xiao-Bi Xie;Z. Yao
中科院分区：
文献类型：
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作者：
Xi He;Lian‐Feng Zhao;Xiao-Bi Xie;Z. Yao
2017年9月3日，中朝边境附近的朝鲜核试验场发生强烈地震。利用从区域地震数据计算的P/S型谱比，我们确定这一事件为爆炸。采用高精度相对定位方法，以朝鲜第一次核试验为主事件，利用误差椭圆得到此次爆炸的震中位置为41.3018° N，129.0696° E，相对定位精度为0.87 m。爆炸发生后8分钟，分别于2017年9月23日和10月12日发生了三次中等地震事件。重新定位表明，第一次爆炸后事件发生在核试验的同一座山下，但其他两次事件发生在爆炸东北约8公里处。根据它们的光谱比，这些后爆炸事件与爆炸事件明显不同。电子补充：各个台站的Pn差分走时表和YNB台站记录的Pn波形图，以及朝鲜试验场（NKTS）事件和各个台站和事件的光谱比之间的比较。
On 3 September 2017, a strong seismic event occurred at the North Korean nuclear test site near the border between China and North Korea. Using P/S-type spectral ratios calculated from regional seismic data, we identified this event as an explosion. Using a high-precision relative location method, with the first North Korean nuclear test as the master event, we obtained that the epicenter of this explosion was at 41.3018° N and 129.0696° E with a relative location precision of ∼87 m based on the error ellipse. This explosion was followed by three moderate seismic events, which occurred 8 min after the explosion, on 23 September and 12 October 2017, respectively. The relocation suggests that the first postexplosion event occurred under the same mountain as the nuclear tests, but the other two events were located about 8 km to the northeast of the explosion. Based on their spectral ratios, these postexplosion events are clearly distinguished from the explosions. Electronic Supplement: Table of Pn differential travel times at individual stations and figures of Pn waveforms recorded at YNB station and compared among North Korean test site (NKTS) events and spectral ratios from individual stations and events.