MOSCOW. Feb 12 (Interfax) - The North Korean nuclear blast epicenter was one kilometer underground; no harmful atmospheric discharges have been detected, Roshydromet situational center head Yuri Varakin told Interfax on Tuesday.
Roshydromet switched from daily to hourly radiation monitoring in connection with the North Korean tests, he said.
"Radiation levels are normal so far, which is proven with measurements done at stationary and mobile posts," Varakin said.
"The blast epicenter was one kilometer underground on the nuclear testing range. If any discharge or abnormal situation has happened, that would have been noticed. Tests are done underground to prevent atmospheric discharges and contamination," Varakin said.
He said the wind was blowing towards the Chinese border at the time of detonation and would change its direction towards South Korea during the day.
"Nothing is heading towards us," Varakin said.