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Title: Relative surface wave amplitude and phase anomalies from the Democratic People's Republic of Korea announced nuclear tests

Abstract

Here, we performed relative locations of six event pairs based on surface wave (SW) and body wave (BW) differential traveltimes of the 9 September 2016, 6 January 2016, 12 February 2013, and 25 May 2009 announced North Korea nuclear explosions. The SW relative locations for the 25 May 2009 and 12 February 2013 events were inconsistent with the BWs when paired with other events, and only the 6 January 2016/9 September 2016 pair was consistent. Apparent SW phase shift is investigated with respect to the BW relative locations. The pairs formed with the 25 May 2009 and 12 February 2013 events, beneath the southeast slope of Mount Mant'ap, have the largest phase shifts and amplitude ratio deviations, whereas the least deviation was from the 6 January 2016 and 9 September 2016 event pair beneath the mountain peak. Regional moment tensors (MTs) predict the amplitude ratios but do not resolve the relative phase. We find that MTs with 10% difference in isotropic and rotated +CLVD can fit both relative phase and amplitude ratios. SW relative locations of highly isotropic and correlated explosion clusters can be affected by topography and small differences in MT.

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1413175
Report Number(s):
LLNL-JRNL-733042
Journal ID: ISSN 0094-8276; TRN: US1800416
Grant/Contract Number:  
AC52-07NA27344
Resource Type:
Accepted Manuscript
Journal Name:
Geophysical Research Letters
Additional Journal Information:
Journal Volume: 44; Journal Issue: 17; Journal ID: ISSN 0094-8276
Publisher:
American Geophysical Union
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; surface waves; relative location; amplitude ratios; differential phase; explosion source

Citation Formats

Ichinose, G. A., Myers, S. C., Ford, S. R., Pasyanos, M. E., and Walter, W. R.. Relative surface wave amplitude and phase anomalies from the Democratic People's Republic of Korea announced nuclear tests. United States: N. p., 2017. Web. https://doi.org/10.1002/2017GL074577.
Ichinose, G. A., Myers, S. C., Ford, S. R., Pasyanos, M. E., & Walter, W. R.. Relative surface wave amplitude and phase anomalies from the Democratic People's Republic of Korea announced nuclear tests. United States. https://doi.org/10.1002/2017GL074577
Ichinose, G. A., Myers, S. C., Ford, S. R., Pasyanos, M. E., and Walter, W. R.. Tue . "Relative surface wave amplitude and phase anomalies from the Democratic People's Republic of Korea announced nuclear tests". United States. https://doi.org/10.1002/2017GL074577. https://www.osti.gov/servlets/purl/1413175.
@article{osti_1413175,
title = {Relative surface wave amplitude and phase anomalies from the Democratic People's Republic of Korea announced nuclear tests},
author = {Ichinose, G. A. and Myers, S. C. and Ford, S. R. and Pasyanos, M. E. and Walter, W. R.},
abstractNote = {Here, we performed relative locations of six event pairs based on surface wave (SW) and body wave (BW) differential traveltimes of the 9 September 2016, 6 January 2016, 12 February 2013, and 25 May 2009 announced North Korea nuclear explosions. The SW relative locations for the 25 May 2009 and 12 February 2013 events were inconsistent with the BWs when paired with other events, and only the 6 January 2016/9 September 2016 pair was consistent. Apparent SW phase shift is investigated with respect to the BW relative locations. The pairs formed with the 25 May 2009 and 12 February 2013 events, beneath the southeast slope of Mount Mant'ap, have the largest phase shifts and amplitude ratio deviations, whereas the least deviation was from the 6 January 2016 and 9 September 2016 event pair beneath the mountain peak. Regional moment tensors (MTs) predict the amplitude ratios but do not resolve the relative phase. We find that MTs with 10% difference in isotropic and rotated +CLVD can fit both relative phase and amplitude ratios. SW relative locations of highly isotropic and correlated explosion clusters can be affected by topography and small differences in MT.},
doi = {10.1002/2017GL074577},
journal = {Geophysical Research Letters},
number = 17,
volume = 44,
place = {United States},
year = {2017},
month = {8}
}

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    Works referencing / citing this record:

    Yield Estimates for the Six North Korean Nuclear Tests From Teleseismic P Wave Modeling and Intercorrelation of P and Pn Recordings
    journal, May 2019

    • Voytan, Dimitri P.; Lay, Thorne; Chaves, Esteban J.
    • Journal of Geophysical Research: Solid Earth, Vol. 124, Issue 5
    • DOI: 10.1029/2019jb017418