EMRAH BUDAKOĞLU, GÜNDÜZ HORASAN, Hilal YALÇIN, LEVENT GÜLEN

Investigation of Seismograms of North Korean Nuclear Explosion of September 3, 2017 Recorded by the Sakarya University and Kandilli Observatory Seismic Stations

A nuclear test was done on September 3, 2017 in North Korea. This activity is regarded as a nuclear test based on both CTBTO analysis and the statement of the official North Korean news agency. The type of explosion was announced as a fusion based thermonuclear hydrogen bomb. Preliminary solution of CTBTO International Data Center (IDC) reported the origin time, epicenter coordinates and magnitude as 03:30:01 UTC, 41.3°N 129.1°E, and mb 6.1. U.S. Geological Survey (USGS) determined these parameters as 41.343°N, 129.036 °E and body wave magnitude, mb 6.3. In this study the seismograms of September 3, 2017 North Korean nuclear test recorded by the Sakarya University and Kandilli Observatory seismic stations were investigated. As we observed the first motion polarity is upwards for the explosion records but the first motion polarity is downwards for the April 14, 2014 Japan earthquake records. Also we statistically analyzed the North Korean nuclear explosions and some teleseismic earthquakes near Japan by using mb/Ms values. Linear discriminant function (LDF) was used to discriminate teleseismic events and nuclear explosions. The discrimination success percentage is 100 % in this study.

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Boğaziçi Üniversi Kandilli Rasathanesi ve Deprem Araştırma Enstitüsü. (http://www.koeri.boun.edu.tr/belbasi).

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