According to Yonhap: Lianxing Wen, a geophysics professor at the State University of New York in Stony Brook, and his graduate student, Hui Long, located the epicenter of the second nuclear test on May 5 last year with a margin of error of only 140 meters, compared with 3.8 kilometers achieved by the U.S. Geological … Continue reading US scientists pinpoint location of DPRK’s second nuclear test