North Korea nuclear test felt in Songdo (Incheon)

My wife and I had just finished lunch earlier this afternoon.   We live in a 15th floor faculty housing apartment on the Incheon Global Campus.   Our apartment began to move perceptibly from side to side and hanging objects began to sway and make a little noise.  This continued for 1-2 minutes about 12:31-12:32 P.M.  It reminded us of the tremors we felt in our apartment during last year's 5.4 magnitude quake that centered around Kyongju.   This time, however, the news media were reporting within minutes that the tremor was man-made.