Estimation on the yield ratio between the DPRK’s 2013 and 2016 underground nuclear explosions using P wave amplitude and corner frequency ratios

Tae Sung Kim1, Il-Young Che2 and Inho Kim1, (1)KIGAM Korea Institute of Geoscience and Mineral Resources, Daejeon, South Korea, (2)Korea Institute of Geoscience and Mineral Resources, Earthquake Research Center, Daejeon, South Korea