Magnitude 4.7 Date-Time Monday, May 25, 2009 at 00:54:43 UTC Monday, May 25, 2009 at 09:54:43 AM at epicenter Time of Earthquake in other Time Zones Location 41.331°N, 129.011°E Depth 0 km (~0 mile) set by location program Region NORTH KOREA Distances 75 km (45 miles) NNW of Kimchaek, North Korea 95 km (60 miles) SW of Chongjin, North Korea 180 km (110 miles) SSW of Yanji, Jilin, China 380 km (235 miles) NE of PYONGYANG, North Korea Location Uncertainty horizontal +/- 5.3 km (3.3 miles); depth fixed by location program Parameters NST= 76, Nph= 76, Dmin=474.4 km, Rmss=0.8 sec, Gp= 68°, M-type=body wave magnitude (Mb), Version=8 Source USGS NEIC (WDCS-D) Event ID us2009hbaf
Yeah, the 4.7 is old, the last one I read said they upgraded it to a 5.5, which would put the blast in the 20 kt range, 1945 technology but enough to blow a sizable city to he** if they desired.