Seismological discrimination and yield estimation of the 3 September 2017 Democratic People&prime;s Republic of Korea (DPRK) underground nuclear test

LianFeng ZHAO; Xu ZHAO; ZhenXing YAO; XiaoBi XIE; Xi HE

doi:10.1360/n972017-00979

Seismological discrimination and yield estimation of the 3 September 2017 Democratic People′s Republic of Korea (DPRK) underground nuclear test

Chinese Science Bulletin (Chinese Version) ◽

10.1360/n972017-00979 ◽

2017 ◽

Vol 62 (35) ◽

pp. 4163-4168 ◽

Cited By ~ 4

Author(s):

LianFeng ZHAO ◽

Xu ZHAO ◽

ZhenXing YAO ◽

XiaoBi XIE ◽

Xi HE

Keyword(s):

Nuclear Test ◽

Republic Of Korea ◽

Yield Estimation

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Yield Estimation of the 11 May 1998 Indian Nuclear Test Using Relative Static Source Strength

Chinese Journal of Geophysics ◽

10.1002/cjg2.760 ◽

2005 ◽

Vol 48 (5) ◽

pp. 1164-1169 ◽

Cited By ~ 1

Author(s):

Lian-Feng ZHAO ◽

Wei-Min WANG ◽

Juan LI ◽

Zhen-Xing YAO

Keyword(s):

Nuclear Test ◽

Source Strength ◽

Yield Estimation ◽

Static Source

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Large Isotropic Component in the Source Mechanism of the 2013 Democratic People’s Republic of Korea Nuclear Test Revealed via a Hierarchical Bayesian Inversion

Bulletin of the Seismological Society of America ◽

10.1785/0120190062 ◽

2020 ◽

Vol 110 (1) ◽

pp. 166-177 ◽

Cited By ~ 2

Author(s):

Marija Mustać ◽

Babak Hejrani ◽

Hrvoje Tkalčić ◽

Seongryong Kim ◽

Sang-Jun Lee ◽

...

Keyword(s):

Moment Tensor ◽

Nuclear Test ◽

Republic Of Korea ◽

Noise Model ◽

Seismic Moment Tensor ◽

Hierarchical Bayesian ◽

Waveform Data ◽

Isotropic Component ◽

Recorded Data ◽

Nuclear Tests

ABSTRACT The 12 February 2013 nuclear test conducted by the Democratic People’s Republic of Korea stands out among other nuclear tests because it produced unusually large transversal motions. Previous studies found various percentages of isotropic components of the seismic moment tensor (MT), which opens up an important question about the reliability of the methods and assumptions we routinely use to recover the seismic MT in the point source approximation. Of particular interest is the data noise model that can be utilized to represent the uncertainty associated with the recorded data. If the noise is not accounted for, this may result in a range of unwanted effects such as overfitting waveform data, and, in turn, it may lead to erroneous conclusions. We thus scrutinize the analyses of the seismic MT of this explosion by performing a thorough analysis of the source depth and time utilizing newly developed Earth structure models to invert seismograms at regional distances at different frequency bands. In addition, we estimate the solution uncertainty within a hierarchical Bayesian framework that allows accounting for noise in the data. Our results show that the resulting MT of this event contains an expectedly large isotropic component (about 70%) and a dip-slip faulting.

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Path Calibration of the Democratic People’s Republic of Korea 3 September 2017 Nuclear Test

Seismological Research Letters ◽

10.1785/0220210105 ◽

2021 ◽

Author(s):

Douglas S. Dreger ◽

Roland Gritto ◽

Owen Nelson

Keyword(s):

Moment Tensor ◽

Source Parameters ◽

Seismic Source ◽

Nuclear Test ◽

Republic Of Korea ◽

Source Analysis ◽

The Sea Of Japan ◽

Source Modeling ◽

Velocity Models ◽

Cross Correlation Analysis

Abstract The recovery of seismic source parameters requires the use of calibrated velocity models. Although at long periods it is possible to use relatively simple plane-layered models, calibration is still needed to better constrain source parameters. For the Democratic People’s Republic of Korea (DPRK) nuclear tests, this is particularly true when considering the use of seismic stations in Japan where paths cross the Sea of Japan. In this study, we perform forward waveform modeling to calibrate velocity structures. We show that we can arrive at a set of models that minimizes Rayleigh group-velocity anomaly at stations located in China, South Korea, and Japan. Overall moment tensor capability with the new models is improved such that cross-correlation analysis of the 20–50 s period waveforms recovers the true time alignment of the data, enabling better automated source analysis. We performed source-type inversions for the moment tensor jointly for long-period regional waveforms and regional and teleseismic P-waves polarity data for the latest and largest DPRK nuclear test and examine event discrimination/screening capability, scalar moment, and yield estimates with uncertainty. We present the models for improved seismic source modeling of the region.

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