Magnitude of North Korea seismic event greater than last one: CTBTO agency

VIENNA (Reuters) - Preliminary data collected by the Comprehensive Nuclear-Test-Ban Treaty Organization (CTBTO) in Vienna indicates that the magnitude of the seismic event detected in North Korea on Friday was greater than a previous one in January, the agency's chief said. CTBTO Executive Secretary Lassina Zerbo told reporters in Vienna that early information indicated a magnitude on Friday of around 5 compared to 4.8 to 4.9 in January. North Korea said on Friday that it had successfully conducted a nuclear explosion test, its fifth and most powerful atomic test to date. (Reporting by Kirsti Knolle; Editing by Dominic Evans)