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

triggered We We used cross-spectral and ratios in a tests Our analyses confirm that the recent southern events are both tectonic  Two events of magnitude ( m b ) 3.6 − 3.8 occurred in southern North Korea (NK) on 27 June 2019 and 11 May 2020 about 330 − 400 km from known nuclear site.  Their location within NK, a country with a recent history underground tests, for monitoring community.  We used P / Lg ratios from regional stations to categorize seismic events that occurred in NK from October 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