Relative Relocations of the North Korean Nuclear Tests From 2006 to 2017 Using the Hi‐Net Array in Japan

Wang, Dun; Hutko, A. R.

doi:10.1029/2018gl078653

Cited by 7 publications

(2 citation statements)

References 22 publications

(56 reference statements)

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“…11b). A clear guide to array data selection may be required when using the backprojection method, and we recognize that the results of array data calculations are more accurate when the appropriate region is chosen (Wang and Hutko, 2018). Aftershocks that have been relocated can be used to determine rupture fault trajectories, and their combination with inverse projection techniques has been applied to determine transient shear ruptures Cheng et al, 2023).…”

Section: Lowess-fit Results and Fault Rupturementioning

confidence: 99%

Rapid estimation of seismic intensities by analyzing early aftershock sequences using the robust locally weighted regression program (LOWESS)

Zhao,

Chen,

Zhang

et al. 2023

Nat. Hazards Earth Syst. Sci.

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Abstract. Accurate and rapid assessment of seismic intensity after a destructive earthquake is essential for efficient early emergency response. We proposed an improved method, AL-SM99, to assess seismic intensity by analyzing aftershock sequences that occur within 2 h of mainshocks. The implementation effect and application conditions of this method were illustrated using 27 earthquakes with Mw 6.5–8.3 that occurred globally between 2000 and 2023. When the fault system in the seismic region is clear and simple, the robust LOWESS-fitted (locally weighted regression program) curves could be used to estimate the location and length of the fault rupture. LOWESS results can indicate the overall rupture trend and make reliable rupture-scale judgments even when the fault system is complex. When Mw ≥ 7.0 and the number of aftershocks exceeds 40, the AL-SM99 intensity evaluation results may be more reliable. Using aftershock catalogues obtained by conventional means allows for a stable assessment of seismic intensities within 1.5 h of the mainshock. When the number of aftershocks is sufficiently large, the intensity assessment time can be greatly reduced. With early accessible aftershocks, we can quickly determine the rupture fault planes and have a better estimate of the seismic intensities. The results of the intensity assessment provide a useful guide for determining the extent of the hardest-hit areas. By expanding the data sources for seismic intensity assessment, the early accessible data are utilized adequately. This study provides a valuable reference point for investigating the relationship between early aftershock events and fault rupture.

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Section: Lowess-fit Results and Fault Rupturementioning

confidence: 99%

Rapid estimation of seismic intensities by analyzing early aftershock sequences using the robust locally weighted regression program (LOWESS)

Zhao,

Chen,

Zhang

et al. 2023

Nat. Hazards Earth Syst. Sci.

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“…Sites of artificial explosions are often clustered and share similar path and site effects. For example, all the North Korea nuclear tests were in the Punggye-ri site, within a few km from each other (Zhang and Wen, 2013, Zhang and Wen, 2015, Wang and Hutko, 2018, Xu et al, 2020. As shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

Bayesian differential moment tensor inversion: theory and application to the North Korea nuclear tests

Jia

Zhan

Helmberger

2022

Geophysical Journal International

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Summary Moment tensors are key to seismic discrimination but often require accurate Green's functions for estimation. This limits the regions, frequency bands, and wave types in moment tensor inversions. In this study, we propose a differential moment tensor inversion (diffMT) method that uses relative measurements to remove the path effects shared by clustered events, thereby improving the accuracy of source parameters. Using results from regular inversions as a priori distribution, we apply Bayesian Markov Chain Monte Carlo to invert the body- and surface-wave amplitude ratios of an event pair for refined moment tensors of both events. Applications to three North Korea nuclear tests from 2013 to 2016 demonstrate that diffMT reduces the uncertainties substantially compared with the traditional waveform-based moment tensor inversion. Our results suggest high percentages of explosive components with similar double-couple components for the North Korea nuclear tests.

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Relocation of the Foreshocks and Aftershocks of the 2021 Ms 6.4 Yangbi Earthquake Sequence, Yunnan, China

Yang

Fang

et al. 2022

J. Earth Sci.

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Relative Relocations of the North Korean Nuclear Tests From 2006 to 2017 Using the Hi‐Net Array in Japan

Cited by 7 publications

References 22 publications

Rapid estimation of seismic intensities by analyzing early aftershock sequences using the robust locally weighted regression program (LOWESS)

Rapid estimation of seismic intensities by analyzing early aftershock sequences using the robust locally weighted regression program (LOWESS)

Bayesian differential moment tensor inversion: theory and application to the North Korea nuclear tests

Relocation of the Foreshocks and Aftershocks of the 2021 Ms 6.4 Yangbi Earthquake Sequence, Yunnan, China

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