Investigation of Regional Source Properties of the Underground Nuclear Explosion in North Korea

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Abstract:

We explore the source properties of the October 9, 2006, underground nuclear explosion UNE in North Korea from regional phases. The dense seismic stations deployed in South Korea, Japan, and China provided us unique regional observations of the UNE. The unique data set allows us to investigate the source properties by regional phases. The isotropic moment of UNE is estimated by 2.9 X 1014 Nm from long-period waveforms. The source spectra of regional phases from the UNE are inverted. We determine the apparent moment, corner frequency, overshoot parameter, attenuation factors, and frequency power-dependence terms from the inversion. We present the inverted source spectra with comparison of theoretical source-spectral models. The inverted source spectra agree well with theoretical curves based on UNE source-spectral models. We find that the overshoot parameters of P phases are determined as close to those from theoretical UNE source-spectral models. On the other hand, the overshoot parameters of S are determined close to zero. The low overshoot parameters for S phases suggest that their excitation sources may be different from those of P phases. We analyze the source spectra of natural earthquakes at a nearby location for comparison with those of the UNE. We test PS spectral-amplitude ratios for discrimination between UNE and earthquakes.

Author(s):
Hong, Tae-kyung ; Rhie, Junkee
Author Organization(s):
YONSEI UNIV SEOUL (REPUBLIC OF KOREA)
Descriptive Note:
Conference paper
Supplementary Note:
Published in the Proceedings of the 30th Monitoring Research Review: Ground-Based Nuclear Explosion Monitoring Technologies, 23-25 Sep 2008, Portsmouth, VA sponsored by the National Nuclear Security Administration (NNSA) and the Air Force Research Laboratory (AFRL). The original document contains color images.
Pagination:
0006

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release
Distribution Statement:
Approved For Public Release; Distribution Is Unlimited.

RECORD

Collection: TR
Identifying Numbers
Contract/Grant Number(s):
CATHER-2007-5111
Monitor Series:
X5
 Subject Terms
Joint Capability Areas:
JCA_6.3.3_Spectrum Management; JCA_6_Net Centric; JCA_6.3_Net Management; JCA_8_Building Partnerships
Communities of Interest:
Energy and Power Technologies
Descriptor(s):
*UNDERGROUND EXPLOSIONS, *NORTH KOREA, *NUCLEAR EXPLOSIONS, SYMPOSIA, WAVEFORMS, SEISMIC DETECTION, JAPAN, PHASE, SPECTRA, ISOTROPISM, HIGH DENSITY, SEISMIC WAVES, ATTENUATION, INVERSION, EARTHQUAKES, SOUTH KOREA, CHINA, SOURCES, SEISMOLOGICAL STATIONS, DATA BASES, FREQUENCY
Field(s)/Group(s):
Seismology, Explosions, Nuclear Weapons
Keyword(s):
FOREIGN REPORTS, UNDERGROUND NUCLEAR EXPLOSIONS
Report Date:
2008 Sep 01
Creation Date:
2010 Mar 31