scholarly journals Moment Tensor Inversion for Nuclear Explosions: What Can We Learn from the 6 January and 9 September 2016 Nuclear Tests, North Korea?

2017 ◽  
Vol 88 (2A) ◽  
pp. 300-310 ◽  
Author(s):  
Simone Cesca ◽  
Sebastian Heimann ◽  
Marius Kriegerowski ◽  
Joachim Saul ◽  
Torsten Dahm
Keyword(s):  
North Korea ◽  
Moment Tensor ◽  
Moment Tensor Inversion ◽  
Nuclear Explosions ◽  
Nuclear Tests

Full Moment Tensor Solutions of U.S. Underground Nuclear Tests for Event Screening and Yield Estimation

2021 ◽  
Author(s):  
Michael E. Pasyanos ◽  
Andrea Chiang
Keyword(s):  
Moment Tensor ◽  
Test Site ◽  
Event Identification ◽  
Nuclear Explosions ◽  
Explosion Monitoring ◽  
Yield Determination ◽  
Nuclear Tests ◽  
Chemical Explosions ◽  
Material Conditions ◽  
Full Moment Tensor

ABSTRACT Moment tensor (MT) solutions are proving increasingly valuable in explosion monitoring, especially now that they are more routinely calculated for the unconstrained, full (six component) MT. In this study, we have calculated MTs for U.S. underground nuclear tests conducted at the Nevada National Security Site using seismic recordings primarily from the Livermore Nevada Network. We are able to determine them for 130 nuclear explosions from 1970 to 1996 for a range of yields and under a variety of material conditions, which we have supplemented with 10 additional chemical explosions at the test site. The result is an extensive database of MTs that can be used to assess the performance of important monitoring tasks such as event identification and yield determination. We test the explosion event screening on the fundamental lune of the MT eigensphere and find MT screening to be a robust discriminant between earthquakes and explosions. We then explore the estimation of moment-derived yield, in which we find that material properties are the largest contributor to differences in the estimated moment-to-yield ratio. Further research conducted on this dataset can be used to develop, test, and improve various explosion monitoring methodologies.

Full Moment Tensor Analysis of Nuclear Explosions in North Korea

2018 ◽  
Vol 89 (6) ◽  
pp. 2139-2151 ◽  
Author(s):  
Celso Alvizuri ◽  
Carl Tape
Keyword(s):  
North Korea ◽  
Moment Tensor ◽  
Tensor Analysis ◽  
Nuclear Explosions ◽  
Moment Tensor Analysis ◽  
Full Moment Tensor

Discrimination of Seismic Events (2006–2020) in North Korea Using P/Lg Amplitude Ratios from Regional Stations and a Bivariate Discriminant Function

2021 ◽  
Author(s):  
Rigobert Tibi
Keyword(s):  
Discriminant Function ◽  
North Korea ◽  
Test Site ◽  
Seismic Events ◽  
Triggered Earthquakes ◽  
Nuclear Explosions ◽  
Cavity Collapse ◽  
Tectonic Earthquakes ◽  
Nuclear Tests ◽  
Discriminant Power

Abstract Two events of magnitude (mb) 3.6–3.8 occurred in southern North Korea (NK) on 27 June 2019 and 11 May 2020. Although these events were located ∼330–400  km from the known nuclear test site, the fact that they occurred within the territory of NK, a country with a recent history of underground nuclear tests, made them events of interest for the monitoring community. We used P/Lg ratios from regional stations to categorize seismic events that occurred in NK from 2006 to May 2020, including these two recent events, the six declared NK nuclear tests, and the cavity collapse and triggered earthquakes that followed the 3 September 2017 nuclear explosion. We were able to separate the cavity collapse from the population of nuclear explosions. However, based on P/Lg ratios, the distinction between the earthquakes and the cavity collapse is ambiguous. The performed discriminant analyses suggest that combining Pg/Lg and Pn/Lg ratios results in improved discriminant power compared with any of the ratio types alone. We used the two ratio types jointly in a quadratic discriminant function and successfully classified the six declared nuclear tests and the triggered earthquakes that followed the September 2017 explosion. Our analyses also confirm that the recent southern events of June 2019 and May 2020 are both tectonic earthquakes that occurred naturally.

scholarly journals The waveform inversion of mainshock and aftershock data of the 2006 M6.3 Yogyakarta earthquake

2021 ◽  
Vol 8 (1) ◽  
Author(s):  
Hijrah Saputra ◽  
Wahyudi Wahyudi ◽  
Iman Suardi ◽  
Ade Anggraini ◽  
Wiwit Suryanto
Keyword(s):  
Joint Inversion ◽  
Body Wave ◽  
Moment Tensor ◽  
Near Field ◽  
Source Parameters ◽  
Waveform Inversion ◽  
Moment Tensor Inversion ◽  
Slip Distribution ◽  
Aftershock Distribution ◽  
Velocity Models

AbstractThis study comprehensively investigates the source mechanisms associated with the mainshock and aftershocks of the Mw = 6.3 Yogyakarta earthquake which occurred on May 27, 2006. The process involved using moment tensor inversion to determine the fault plane parameters and joint inversion which were further applied to understand the spatial and temporal slip distributions during the earthquake. Moreover, coseismal slip distribution was overlaid with the relocated aftershock distribution to determine the stress field variations around the tectonic area. Meanwhile, the moment tensor inversion made use of near-field data and its Green’s function was calculated using the extended reflectivity method while the joint inversion used near-field and teleseismic body wave data which were computed using the Kikuchi and Kanamori methods. These data were filtered through a trial-and-error method using a bandpass filter with frequency pairs and velocity models from several previous studies. Furthermore, the Akaike Bayesian Information Criterion (ABIC) method was applied to obtain more stable inversion results and different fault types were discovered. Strike–slip and dip-normal were recorded for the mainshock and similar types were recorded for the 8th aftershock while the 9th and 16th June were strike slips. However, the fault slip distribution from the joint inversion showed two asperities. The maximum slip was 0.78 m with the first asperity observed at 10 km south/north of the mainshock hypocenter. The source parameters discovered include total seismic moment M0 = 0.4311E + 19 (Nm) or Mw = 6.4 with a depth of 12 km and a duration of 28 s. The slip distribution overlaid with the aftershock distribution showed the tendency of the aftershock to occur around the asperities zone while a normal oblique focus mechanism was found using the joint inversion.

North Korea in 2016

Asian Survey ◽  
2017 ◽  
Vol 57 (1) ◽  
pp. 119-127
Author(s):  
Charles K. Armstrong
Keyword(s):  
Security Council ◽  
North Korea ◽  
Leadership Position ◽  
Un Security Council ◽  
Nuclear Tests

Kim Jong Un further consolidated his leadership position at the Seventh Congress of the Workers’ Party in May, the first congress since 1980. Pyongyang conducted two nuclear tests and made advances in missile delivery, eliciting strong sanctions resolutions from the UN Security Council, first in March and again in November.

scholarly journals Regional Moment Tensor Inversion using Rotational Observations

2020 ◽  
Author(s):  
Gene Aaron Ichinose ◽  
Sean Ricardo Ford ◽  
Robert J. Mellors
Keyword(s):  
Moment Tensor ◽  
Moment Tensor Inversion

An Application of Relative Moment Tensor Inversion to Aftershocks of the June 1998 Hengill Earthquake in Southwest Iceland

2008 ◽  
Vol 98 (2) ◽  
pp. 636-650 ◽  
Author(s):  
L. Hagos ◽  
H. Shomali ◽  
B. Lund ◽  
R. Bothvarsson ◽  
R. Roberts
Keyword(s):  
Moment Tensor ◽  
Moment Tensor Inversion

scholarly journals Initial-rupture fault, main-shock fault, and aftershock faults: Fault geometry and bends inferred from centroid moment tensor inversion of the 2005 west off Fukuoka prefecture earthquake

2006 ◽  
Vol 58 (1) ◽  
pp. 69-74 ◽  
Author(s):  
Yoshihiro Ito ◽  
Kazushige Obara ◽  
Tetsuya Takeda ◽  
Katsuhiko Shiomi ◽  
Takumi Matsumoto ◽  
...  
Keyword(s):  
Main Shock ◽  
Moment Tensor ◽  
Moment Tensor Inversion ◽  
Fault Geometry ◽  
Centroid Moment Tensor ◽  
Fukuoka Prefecture ◽  
Initial Rupture

scholarly journals HybridMT: A MATLAB/Shell Environment Package for Seismic Moment Tensor Inversion and Refinement

2016 ◽  
Vol 87 (4) ◽  
pp. 964-976 ◽  
Author(s):  
Grzegorz Kwiatek ◽  
Patricia Martínez‐Garzón ◽  
Marco Bohnhoff
Keyword(s):  
Seismic Moment ◽  
Moment Tensor ◽  
Moment Tensor Inversion ◽  
Seismic Moment Tensor
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