LOCATION AND IDENTIFICATION OF SEISMIC EVENTS AROUND NORTH KOREAN NUCLEAR TEST SITE FOLLOWING THE 3 SEPTEMBER 2017 UNDERGROUND NUCLEAR TEST
https://doi.org/10.52676/1729-7885-2018-2-11-19
Abstract
At least thirteen small seismic events that occurred close to and following the North Korean underground nuclear test (UNT) on 3 September 2017 were detected and located by using seismic waveform data from regional stations. Other than the first event, widely reported to be a cavity collapse, the magnitudes of these shocks range from 2.3 to 3.6. Based on their timing, and proximity to the UNTs, these shocks may be considered as aftershocks. They are located within 1 km of each other with small relative location errors, approximately 50 m. We assess a method to classify each of these small events separately based on their spectral amplitude ratios derived from regional P- and S-waves. We examine additional possible small seismic events around the North Korean test site by using seismic data from stations in South Korea, Russia, and northeastern China including IMS seismic arrays, GSN stations, and national network stations. A linear discriminant function based on Mahalanobis methods applied to P/S spectral ratios does a better job of screening events than does a simple average of such ratios.
Supporting agencies: Our work has been supported by the Consortium for Verification Technology under Department of Energy/ National Nuclear Security Administration award DENA0002534 via a subcontract between Columbia University and the University of Michigan, and by the Defense Threat Reduction Agency under award HDTRA-1-11-1-00027. This is Lamont-Doherty Earth Observatory contribution number xxxx.
About the Authors
W.-Y. Kim
Lamont-Doherty Earth Observatory, Columbia University
United States
New York
United States
New York
D. Schaff
Lamont-Doherty Earth Observatory, Columbia University
United States
New York
United States
New York
P. G. Richards
Lamont-Doherty Earth Observatory, Columbia University
United States
New York
United States
New York
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Review
For citations:
Kim W., Schaff D., Richards P.G. LOCATION AND IDENTIFICATION OF SEISMIC EVENTS AROUND NORTH KOREAN NUCLEAR TEST SITE FOLLOWING THE 3 SEPTEMBER 2017 UNDERGROUND NUCLEAR TEST. NNC RK Bulletin. 2018;(2):11-19. https://doi.org/10.52676/1729-7885-2018-2-11-19
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