Seismic discrimination of the 2009 North Korean nuclear explosion based on regional source spectra

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Seismic discrimination of an underground nuclear explosion (UNE) based on regional waveforms in continental margins is challenging due to large variations among waveforms. The 2009 North Korean UNE test was conducted in the far eastern Eurasian plate. The UNE was recorded by densely-located regional seismic stations, and regional waveforms exhibit highly path-dependent amplitude and arrival time features due to complex crustal structures. Regional source spectra are calculated by correcting for the path effects on the waveforms. A two-step approach is proposed for stable inversion of source-spectral parameters and path parameters. Characteristic overshoot features are observed in the source spectra, particularly strong in Pn. The path parameter, Q, is determined uniquely regardless of the source-spectral model implemented, which suggests stable separation of path effects from waveform records. The estimated source spectra fit well to a theoretical UNE source-spectral model. The fitness between the estimated and theoretical source-spectral models allows us to discriminate UNEs from natural earthquakes. Also, the P/S source-spectral ratio is observed to be an effective discriminant of UNE.

Original languageEnglish
Pages (from-to)753-769
Number of pages17
JournalJournal of Seismology
Volume17
Issue number2
DOIs
Publication statusPublished - 2013 Apr 9

Fingerprint

seismic discrimination
Underground explosions
Nuclear explosions
nuclear explosions
nuclear explosion
underground explosions
discrimination
waveforms
Eurasian plate
arrival time
crustal structure
continental margin
Earthquakes
fitness
continental shelves
earthquake
arrivals
earthquakes
stations
parameter

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Geochemistry and Petrology

Cite this

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abstract = "Seismic discrimination of an underground nuclear explosion (UNE) based on regional waveforms in continental margins is challenging due to large variations among waveforms. The 2009 North Korean UNE test was conducted in the far eastern Eurasian plate. The UNE was recorded by densely-located regional seismic stations, and regional waveforms exhibit highly path-dependent amplitude and arrival time features due to complex crustal structures. Regional source spectra are calculated by correcting for the path effects on the waveforms. A two-step approach is proposed for stable inversion of source-spectral parameters and path parameters. Characteristic overshoot features are observed in the source spectra, particularly strong in Pn. The path parameter, Q, is determined uniquely regardless of the source-spectral model implemented, which suggests stable separation of path effects from waveform records. The estimated source spectra fit well to a theoretical UNE source-spectral model. The fitness between the estimated and theoretical source-spectral models allows us to discriminate UNEs from natural earthquakes. Also, the P/S source-spectral ratio is observed to be an effective discriminant of UNE.",
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Seismic discrimination of the 2009 North Korean nuclear explosion based on regional source spectra. / Hong, Tae Kyung.

In: Journal of Seismology, Vol. 17, No. 2, 09.04.2013, p. 753-769.

Research output: Contribution to journalArticle

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