(01 of17)
Open Image ModalJapan's meteorological agency officer Yohei Hasegawa displays a chart showing seismic activity, (at L top is today's observation result, observed in China) after a North Korean nuclear test, at the agency in Tokyo on January 6, 2016. (credit:YOSHIKAZU TSUNO via Getty Images)
(02 of17)
Open Image ModalPeople watch a news report on North Korea's first hydrogen bomb test at a railroad station in Seoul on January 6, 2016. South Korea 'strongly' condemned North Korea's shock hydrogen bomb test and vowed to take 'all necessary measures' to penalise its nuclear-armed neighbour. (credit:JUNG YEON-JE via Getty Images)
(03 of17)
Open Image ModalA South Korean army soldier watches a TV screen showing a file image of North Korean leader Kim Jong Un, at the Seoul Railway Station in Seoul, South Korea, Wednesday, Jan. 6, 2016. (credit:ASSOCIATED PRESS)
(04 of17)
Open Image ModalA TV screen shows North Korean leader Kim Jong Un at an electronics store in Tokyo, Wednesday, Jan. 6, 2016. (credit:ASSOCIATED PRESS)
(05 of17)
Open Image ModalNorth Koreans react as they watch a news broadcast on a video screen outside Pyongyang Railway Station in Pyongyang, North Korea, Wednesday, Jan. 6, 2016. (credit:ASSOCIATED PRESS)
(06 of17)
Open Image ModalA man watches a news report at a railroad station in Seoul on January 6, 2016, after seismologists detected a 5.1 magnitude tremor next to North Korea's main atomic test site in the northeast of the country. (credit:JUNG YEON-JE via Getty Images)
(07 of17)
Open Image ModalSouth Korean watch a television broadcast reporting the North Korea's Hydrogen Bomb Test at the Seoul Railway Station on January 6, 2016 in Seoul, South Korea. (credit:Chung Sung-Jun via Getty Images)
(08 of17)
Open Image ModalPeople watch a news report on North Korea's first hydrogen bomb test at a railroad station in Seoul on January 6, 2016. (credit:JUNG YEON-JE via Getty Images)
(09 of17)
Open Image ModalPeople watch a news report on North Korea's first hydrogen bomb test at a railroad station in Seoul on January 6, 2016. South Korea 'strongly' condemned North Korea's shock hydrogen bomb test and vowed to take 'all necessary measures' to penalise its nuclear-armed neighbour. (credit:JUNG YEON-JE via Getty Images)
(10 of17)
Open Image ModalKuo Kai-wen, director of Taiwan's Seismology Center, points at the locations from a monitor showing North Korea's first hydrogen bomb test site, in Taipei on January 6, 2016. (credit:SAM YEH via Getty Images)
(11 of17)
Open Image ModalJapanese Foreign Minister Fumio Kishida (L) listens to US Ambassador to Japan Caroline Kennedy (R) during their talks at the foreign ministry in Tokyo on January 6, 2016 following North Korea's nuclear test. (credit:TOSHIFUMI KITAMURA via Getty Images)
(12 of17)
Open Image ModalJapanese Prime Minister Shinzo Abe delivers a speech at the Lower House's plenary session following a North Korean nuclear test, at the National Diet in Tokyo on January 6, 2016. (credit:YOSHIKAZU TSUNO via Getty Images)
(13 of17)
Open Image ModalJapanese Foreign Minister Fumio Kishida (L) shows the way to US Ambassador to Japan Caroline Kennedy (R) prior to their talks at the foreign ministry in Tokyo on January 6, 2016 following North Korea's nuclear test. (credit:TOSHIFUMI KITAMURA via Getty Images)
(14 of17)
Open Image ModalChinese paramilitary policemen stand guard outside the North Korean Embassy in Beijing, Wednesday, Jan. 6, 2016. (credit:ASSOCIATED PRESS)
(15 of17)
Open Image ModalA Chinese paramilitary policeman stands guard outside the North Korean Embassy in Beijing, Wednesday, Jan. 6, 2016. (credit:ASSOCIATED PRESS)
(16 of17)
Open Image ModalShoppers stand near TV screens which report that North Korea said it had conducted a hydrogen bomb test, at an electronics store in Tokyo, Wednesday, Jan. 6, 2016. (credit:ASSOCIATED PRESS)
(17 of17)
Open Image ModalPeople watch a TV news program showing North Korea's announcement, at the Seoul Railway Station in Seoul, South Korea, Wednesday, Jan. 6, 2016. (credit:ASSOCIATED PRESS)