[MAG31-P01] Waveform Analysis of the DPRK September 2017 event and comparison with previous DPRK events.
Keywords:Waveform Analysis, Nuclear Test, Induced Earthquake
Japan NDC-1 (National Data Centre-1) tried to discriminate this event. The indexes, such as regional P/S ratio, P/S Spectral Ratio and mb:Ms, also indicated features of explosion. As for infrasonic analysis with I30JP and I45RU observation data, I45RU could detect infrasonic signal from this explosive event.
After this biggest 2017 NT event, several earthquakes were occurred near the test site. Analyzing waveform data of these induced events, S-wave amplitude of waveform at close IMS stations is larger than that of P-wave and the feature of these events is presumed to be natural earthquake rather than man-made explosion.