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Collapse and Earthquake Swarm After North Korea's 3 September 2017 Nuclear Test

Geophysical research letters, 2018-05, Vol.45 (9), p.3976-3983 [Peer Reviewed Journal]

2018. American Geophysical Union. All Rights Reserved. ;ISSN: 0094-8276 ;EISSN: 1944-8007 ;DOI: 10.1029/2018GL077649

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  • Title:
    Collapse and Earthquake Swarm After North Korea's 3 September 2017 Nuclear Test
  • Author: Tian, Dongdong ; Yao, Jiayuan ; Wen, Lianxing
  • Subjects: Azimuth ; Collapse ; earthquake swarm ; Earthquakes ; focal depth and mechanism ; Government agencies ; high‐precision relative location ; Hydrogen ; Leaks ; Monitoring ; North Korea's 3 September 2017 nuclear test ; Nuclear tests ; Radioactive materials ; Seismic activity ; Seismic analysis ; small seismic events ; Vertical forces
  • Is Part Of: Geophysical research letters, 2018-05, Vol.45 (9), p.3976-3983
  • Description: North Korea's 3 September 2017 nuclear test was followed by several small seismic events, with one eight‐and‐a‐half minutes after the test and three on and after 23 September 2017. Seismic analysis reveals that the first event is a near vertical on‐site collapse toward the nuclear test center from 440 ± 260 m northwest of the test site, with its seismic source best represented by a single force with a dip angle of 70°–75° and an azimuth of ~150°, and the later events are an earthquake swarm located 8.4 ± 1.7 km north of the test site within a region of 520 m, with a focal depth of at least 2.4 km and a focal mechanism of nearly pure strike slip along the north‐south direction with a high dip angle of 50°–90°. The occurrence of the on‐site collapse calls for continued monitoring of any leaks of radioactive materials from the test site. Plain Language Summary On 3 September 2017, the Democratic People's Republic of Korea (North Korea) announced that it had successfully conducted a thermonuclear (hydrogen bomb) test. The nuclear test was followed by several reported small seismic events occurring in the region. While there have been intense interests and concerns about what has happened after the nuclear test among the scientific community, governmental agencies, and the public, the nature of those events is unknown. In this study, we present high‐precision relative locations and detailed source characteristics of the small events following the test. Seismic analysis reveals that the first event occurring eight‐and‐a‐half minutes after the test is a near vertical on‐site collapse toward the nuclear test center from 440 ± 260 m northwest of the nuclear test site, with its seismic source best represented by a near vertical single force, and the later three events on and after 23 September 2017 are an earthquake swarm located 8.4 ± 1.7 km north of the nuclear test site within a region of 520 m, with an event depth of at least 2.4 km. The occurrence of the on‐site collapse calls for continued monitoring of any leaks of radioactive materials from the test site. Key Points We present high‐precision locations and detailed source information of four small seismic events following North Korea's 2017 nuclear test The first event is an on‐site collapse 440 m northwest of the test site and best explained by a near vertical single force The later events are an earthquake swarm located 8.4 km north of the test site with a focal depth of at least 2.4 km
  • Publisher: Washington: John Wiley & Sons, Inc
  • Language: English
  • Identifier: ISSN: 0094-8276
    EISSN: 1944-8007
    DOI: 10.1029/2018GL077649
  • Source: Wiley Blackwell AGU Digital Archive
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