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Validation on the Bodywave Magnitude Estimation of the 2017 DPRK’s Nuclear Test by Source Scaling
지진원 상대비율 측정법을 이용한 2017년 북한 핵실험의 실체파 규모 검증
Econ. Environ. Geol. 2018 Dec;51(6):589-93
Published online December 31, 2018;  https://doi.org/10.9719/EEG.2018.51.6.589
Copyright © 2018 the Korean society of economic and environmental gelology.

Tae Sung Kim*
김태성*

Earthquake Research Center, Korea Institute of Geoscience and Mineral Resources, Daejeon 34132, Korea
한국지질자원연구원 지진연구센터
Received November 16, 2018; Accepted December 11, 2018.
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
 Abstract
Democratic Peoples’ Republic of Korea (DPRK) conducted the 6th underground nuclear test at the Punggye-ri underground nuclear test site on September 27, 2017 12 hours 30 minutes of Korean local time. Comprehensive Nuclear-Test Ban Treaty Organization (CTBTO) under U.N. announced the body wave magnitude of the event was mb 6.1 while U.S. Geological Survey (USGS)’s calculation was mb 6.3. In this study, the differences of the magnitude estimates were investigated and verified. For this purpose, a source scaling between the 5th and 6th event, which’s epicenters are 200 meters apart, was performed using seismic data sets from 30 broadband stations. The relative amplitude variations of the 6th event compared to the 5th event in the frequency domain was analyzed through the scaling. The increased amount of the bodywave magnitude mb for the 6th event was calculated at 1 Hz, which was compared to those from USGS and CTBTO’s calculations.
Keywords : North Korea’ 6th underground nuclear test, bodywave magnitude, source scaling, USGS, CTBTO

 

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