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Significant release of shear energy of the North Korean nuclear test on February 12, 2013

Barth, Andreas

On February 12, 2013 the Democratic People's Republic of Korea (DPRK) carried out an announced nuclear test, which was the third after tests conducted in 2006 and 2009. An important task in discriminating a man-made explosion and a natural tectonic earthquake is the analysis of seismic waveforms. To determine the isotropic and non-isotropic characteristics of the detonation source, I invert long-period seismic data for the full seismic moment tensor to match the observed seismic signals by synthetic waveforms based on a 3D earth model.
Here, I show that the inversion of long-period seismic data of the 2013 test reveals a clear explosive (isotropic) component combined with a significant release of shear energy by the double-couple part of the moment tensor. While the isotropic part of the nuclear test in 2009 was similar to that in 2013, the double-couple part was lower by a factor of 0.55 compared to the explosion in 2013.
Moreover, the ratio of the isotropic seismic moments of the 2013 and 2009 nuclear tests is 1.4±0.1 and lower than published estimations of the yield ratio, which indicates the importance of considering the release of shear energy. ... mehr

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DOI: 10.5445/IR/1000040671
DOI: 10.1007/s10950-014-9431-6
Zitationen: 18
Web of Science
Zitationen: 18
Cover der Publikation
Zugehörige Institution(en) am KIT Geophysikalisches Institut (GPI)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2014
Sprache Englisch
Identifikator ISSN: 1383-4649
KITopen-ID: 1000040671
Erschienen in Journal of Seismology
Band 18
Heft 3
Seiten 605-615
Nachgewiesen in Scopus
Web of Science
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